Bottlenose dolphin

Last updated

Bottlenose dolphin
Temporal range: Miocene–Recent 3.6–0  Ma
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
↓
[1]
Tursiops truncatus 01.jpg
Bottlenose dolphin surfing in the wake of a research boat
Bottlenose dolphin size.svg
Size compared to an average human
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Delphinidae
Subfamily: Delphininae
Genus: Tursiops
Gervais, 1855
Type species
Delphinus truncatus
Montagu, 1821
Species
Cypron-Range Tursiops truncatus.svg
Bottlenose dolphin range (in blue)

The bottlenose dolphin is a toothed whale in the genus Tursiops. They are common, cosmopolitan members of the family Delphinidae, the family of oceanic dolphins. [3] Molecular studies show the genus contains three species: the common bottlenose dolphin (Tursiops truncatus), the Indo-Pacific bottlenose dolphin (Tursiops aduncus), and Tamanend's bottlenose dolphin (Tursiops erebennus). [4] [5] Others, like the Burrunan dolphin (Tursiops (aduncus) australis), may be alternately considered their own species or be subspecies of T. aduncus. [6] Bottlenose dolphins inhabit warm and temperate seas worldwide, being found everywhere except for the Arctic and Antarctic Circle regions. Their name derives from the Latin tursio (dolphin) and truncatus for the truncated teeth (the type specimen was old and had worn down teeth; this is not a typical characteristic of most members of the species). [7]

Contents

Numerous investigations of bottlenose dolphin intelligence have been conducted, examining mimicry, use of artificial language, object categorization, and self-recognition. They can use tools (sponging; using marine sponges to forage for food sources they normally could not access) [8] and transmit cultural knowledge from generation to generation, and their considerable intelligence has driven interaction with humans. Bottlenose dolphins gained popularity from aquarium shows and television programs such as Flipper . They have also been trained by militaries to locate sea mines or detect and mark enemy divers. In some areas, they cooperate with local fishermen by driving fish into their nets and eating the fish that escape. Some encounters with humans are harmful to the dolphins: people hunt them for food, and dolphins are killed inadvertently as a bycatch of tuna fishing and by getting caught in crab traps.

Bottlenose dolphins have the third largest encephalization levels of any mammal on Earth (humans have the largest, followed by Northern Right whale dolphins), sharing close ratios with those of humans and other cetaceans, while being twice as high of other great apes. [9] This more than likely contributes to their high intelligence. [10]

Taxonomy

Scientists have been long aware of the fact that the Tursiops dolphins might consist of more than one species, as there is extensive variation in color and morphology along its range. In the past, most studies used morphology to evaluate differences between and within species, but in the late 20th century, combining morphological and molecular genetics allowed much greater insight into this previously intractable problem. [11] Since the late 1990s and early 2000s, most researchers acknowledged the existence of two species: [12] the common bottlenose dolphin (T. truncatus), found in coastal and oceanic habitats of most tropical to temperate oceans, and the Indo-Pacific bottlenose dolphin (T. aduncus), that lives in coastal waters around India, northern Australia, South China, the Red Sea, and the eastern coast of Africa.

In 2011, a third distinct species was described, the Burrunan dolphin (T. (aduncus) australis), found in the Port Phillip and Gippsland Lakes areas of Victoria, Australia, after research showed it was distinct from T. truncatus and T. aduncus, both in morphology [13] and genetics. [14] Also, evidence has been accumulating to validate the existence of a separate species, Lahille's bottlenose dolphin, T. gephyreus, [15] [16] [17] [18] that occurs in coastal waters of Argentina, Uruguay and southern Brazil. Other sources accept the Pacific bottlenose dolphin (T. t. gillii or T. gillii), [19] that inhabits the Pacific, and has a black line from the eye to the forehead. [20] [ failed verification ]T. gillii, first described in 1873, is currently considered a junior synonym of T. truncatus. Additionally, T. nuuanu was described in 1911 for bottlenose dolphins along the Pacific coast in Central America. An analysis of T. gillii and T. nuuanu specimens supported T. gillii as a synonym of T. truncatus, while T. nuuanu was recognized as a subspecies. [21] In general, genetic variation between populations is significant, even among nearby populations. [22] As a result of this genetic variation, other distinct species currently considered to be populations of common bottlenose dolphin are possible. [22]

Much of the discussion and doubts about its taxonomy is related to the existence of two ecotypes of bottlenose dolphins in many part of its distribution. For example, the two ecotypes of the common bottlenose dolphin within the western North Atlantic are represented by the shallower water or coastal ecotype and the more offshore ecotype. [23] Their ranges overlap, but they have been shown to be genetically distinct. [23] In 2022, Costa et al. established morphologic, genetic, and evolutionary divergence between the two ecotypes in the western North Atlantic, resurrecting Tursiops erebennus for the coastal form while the offshore form was retained in T. truncatus. [24]

The Society for Marine Mammalogy's Committee on Taxonomy presently recognizes three species of bottlenose dolphin: T. truncatus, T. aduncus, and T. erebennus. They also recognize three subspecies of common bottlenose dolphin in addition to the nominotypical subspecies: the Black Sea bottlenose dolphin (T. t. ponticus), Lahille's bottlenose dolphin (T. t. gephyreus), and the Eastern Tropical Pacific bottlenose dolphin (T. t. nuuanu). [5] The IUCN, on their Red List of endangered species, currently recognises only two species of bottlenose dolphins. [2] The American Society of Mammalogists also recognizes only two species. While acknowledging the studies describing T. australis, it classifies it within T. aduncus. [6]

Indo-Pacific bottlenose dolphin, T. aduncus Tursiops aduncus.JPG
Indo-Pacific bottlenose dolphin, T. aduncus

Some recent genetic evidence suggests the Indo-Pacific bottlenose dolphin belongs in the genus Stenella , since it is more like the Atlantic spotted dolphin (Stenella frontalis) than the common bottlenose dolphin. [25] However, more recent studies indicate that this is a consequence of reticulate evolution (such as past hybridization between Stenella and ancestral Tursiops) and incomplete lineage sorting, and thus support T. truncatus and T. aduncus belonging to the same genus. [26]

Wolphin Kawili'Kai at the Sea Life Park in Hawaii Baby wolphin by pinhole.jpeg
Wolphin Kawili'Kai at the Sea Life Park in Hawaii
The fossil species Tursiops osennae Tursiops-osennaeBologna.JPG
The fossil species Tursiops osennae

Hybrids

Bottlenose dolphins have been known to hybridize with other dolphin species. Hybrids with Risso's dolphin occur both in the wild and in captivity. [27] [28] The best known hybrid is the wholphin, a false killer whale-bottlenose dolphin hybrid. The wholphin is fertile, and two currently live at the Sea Life Park in Hawaii. The first was born in 1985 to a female bottlenose. Wholphins also exist in the wild. [29] In captivity, a bottlenose dolphin and a rough-toothed dolphin hybridized. [30] A common dolphin-bottlenose dolphin hybrid born in captivity lives at SeaWorld California. [31] [32] Other hybrids live in captivity around the world and in the wild, such as a bottlenose dolphin-Atlantic spotted dolphin hybrid. [33]

Fossil species

Bottlenose dolphins appeared during the Miocene. [34] Known fossil species include Tursiops osennae (late Miocene to early Pliocene) [35] from the Piacenzian coastal mudstone, and Tursiops miocaenus (Miocene) from the Burdigalian marine sandstone, all in Italy. [1]

Description

The bottlenose dolphin weighs an average of 300 kg (660 lb), but can range from 150 and 650 kg (330 and 1,430 lb). [36] It can reach a length of just over 4 m (13 ft). Its color varies considerably, is usually dark gray on the back and lighter gray on the flanks, but it can be bluish-grey, brownish-grey, or even nearly black, and is often darker on the back from the rostrum to behind the dorsal fin. This is called countershading and is a form of camouflage. Older dolphins sometimes have a few spots.

Bottlenose dolphins can live for more than 40 years. Females typically live 5–10 years longer than males, with some females exceeding 60 years. [37] [38] [39] This extreme age is rare and less than 2% of all Bottlenose dolphins will live longer than 60 years. [40] Bottlenose dolphins can jump to a height of 6 metres (20 feet) in the air. [41]

Anatomy

Their elongated upper and lower jaws form what is called a rostrum, or snout, which gives the animal its common name. [42] The real, functional nose is the blowhole on top of its head; the nasal septum is visible when the blowhole is open. [37]

Bottlenose dolphin head, showing rostrum and blowhole Bottlenose Dolphin KSC04pd0178 head only.JPG
Bottlenose dolphin head, showing rostrum and blowhole

Bottlenose dolphins have 18 to 28 conical teeth on each side of each jaw. [37] [42]

The flukes (lobes of the tail) and dorsal fin are formed of dense connective tissue and do not contain bone or muscle. The dorsal fin usually shows phenotypic variations that help discriminate among populations. [43] The animal propels itself by moving the flukes up and down. The pectoral flippers (at the sides of the body) are for steering; they contain bones homologous to the forelimbs of land mammals. A bottlenose dolphin discovered in Japan has two additional pectoral fins, or "hind legs", at the tail, about the size of a human's pair of hands. Scientists believe a mutation caused the ancient trait to reassert itself as a form of atavism. [44]

Physiology and senses

Dolphin and a paddler at Dalkey Island Dolphin at Dalkey Island.jpg
Dolphin and a paddler at Dalkey Island

In colder waters, they have more body fat and blood, and are more suited to deeper diving. Typically, 18%–20% of their body weight is blubber. [45] Most research in this area has been restricted to the North Atlantic Ocean. [46] Bottlenose dolphins typically swim at 5 to 11 km/h (1.4 to 3.1 m/s), but are capable of bursts of up to 29 to 35 km/h (8.1 to 9.7 m/s). The higher speeds can only be sustained for a short time. [47] [48]

Senses

The dolphin's search for food is aided by a form of sonar known as echolocation: it locates objects by producing sounds and listening for the echoes. Clicking sounds are emitted in a focused beam in front of the dolphin. When the clicking sounds hit an object in the water, like a fish or rock, they bounce off and come back to the dolphin as echoes. Echolocation tells the dolphins the shape, size, speed, distance, and location of the object. [41] To hear the returning echo, they have two small ear openings behind the eyes, but most sound waves are transmitted to the inner ear through the lower jaw. As the object of interest is approached, the echo becomes booming, and the dolphins adjust by decreasing the intensity of the emitted sounds. (This contrasts with bats and sonar, which reduce the sensitivity of the sound receptor.) The interclick interval also decreases as the animal nears the target. Evidently, the dolphin waits for each click's echo before clicking again. Echolocation details, such as signal strength, spectral qualities, and discrimination, are well understood by researchers. [49] Bottlenose dolphins are also able to extract shape information, suggesting they are able to form an "echoic image" or sound picture of their targets. [50]

They also have electroreception. The calves are born with two slender rows of whiskers along their snout, which fall off soon after birth, leaving behind a series of dimples known as vibrissal pits able to sense electric fields. [51]

Dolphins have sharp eyesight. The eyes are located at the sides of the head and have a tapetum lucidum, or reflecting membrane, at the back of the retina, which aids vision in dim light. Their horseshoe-shaped, double-slit pupils enable dolphins to have good vision both in air and underwater, despite the different indices of refraction of these media. [52] When under water, the eyeball's lens serves to focus light, whereas in the in-air environment, the typically bright light serves to contract the specialized pupil, resulting in sharpness from a smaller aperture (similar to a pinhole camera). [53]

By contrast, a bottlenose's sense of smell is poor, [54] because its blowhole, the analog to the nose, is closed when underwater and it opens only for breathing. Like other toothed whales, it has no olfactory nerves or olfactory lobe in the brain. [54] Bottlenose dolphins are able to detect salty, sweet, bitter (quinine sulphate), and sour (citric acid) tastes, but this has not been well-studied. [54] Anecdotally, some individuals in captivity have been noted to have preferences for food fish types, although it is not clear if taste mediates this preference. [54]

In 2022, a study at the University of St Andrews in Scotland found that dolphins were able to identify their "friends" and family members by the taste of their urine in the water. [55] [56]

Communication

Bottlenose dolphins communicate through burst pulsed sounds, whistles, and body language. [57] Examples of body language include leaping out of the water, snapping jaws, slapping the tail on the surface and butting heads. [58] Sounds and gestures help keep track of other dolphins in the group, and alert other dolphins to danger and nearby food. Lacking vocal cords, they produce sounds using six air sacs near their blow hole. Each animal has a uniquely identifying, frequency-modulated narrow-band signature vocalization (signature whistle). [59]

Signature whistles, which are in a higher frequency range than humans can hear, have an important role in facilitating mother–calf contact. [60] In the Sarasota Dolphin Research Program's library of recordings were 19 female common bottlenose dolphins (Tursiops truncatus) producing signature whistles both with and without the presence of their dependent calf. [60] In all 19 cases, the mother dolphin changed the same signature whistle when the calf was present, by reaching a higher frequency, or using a wider frequency range. [61] Similarly, humans use higher fundamental frequencies and a wider pitch range to inflect child–directed speech (CDS). [61] [60] [62] This has rarely been discovered in other species. [61] The researchers stated that CDS benefits for humans are cueing the child to pay attention, long-term bonding, and promoting the development of lifelong vocal learning, with parallels in these bottlenose dolphins in an example of convergent evolution. [61]

Researchers from the Bottlenose Dolphin Research Institute (BDRI), based in Sardinia (Italy) have now shown whistles and burst pulsed sounds are vital to the animals' social life and mirror their behaviors. [63]

The tonal whistle sounds (the most melodious ones) allow dolphins to stay in contact with each other (above all, mothers and offspring), and to coordinate hunting strategies. [64] The burst-pulsed sounds (which are more complex and varied than the whistles) are used "to avoid physical aggression in situations of high excitement", such as when they are competing for the same piece of food, for example. The dolphins emit these strident sounds when in the presence of other individuals moving towards the same prey. The "least dominant" one soon moves away to avoid confrontation. [63]

Other communication uses about 30 distinguishable sounds, and although famously proposed by John C. Lilly in the 1950s, no "dolphin language" has been found. However, Herman, Richards, and Wolz demonstrated comprehension of an artificial language by two bottlenose dolphins (named Akeakamai and Phoenix) in the period of skepticism toward animal language following Herbert Terrace's critique. [65]

Intelligence

Bottlenose dolphin responding to human hand gestures Military-trained-dolphin.jpg
Bottlenose dolphin responding to human hand gestures

Cognition

Cognitive abilities that have been investigated include concept formation, sensory skills, and mental representations. Such research has been ongoing since the 1970s. This includes: acoustic and behavioral mimicry, [66] [67] comprehension of novel sequences in an artificial language, [68] [69] memory, [70] monitoring of self behavior, [71] discrimination and matching, [70] [72] comprehension of symbols for various body parts, [73] comprehension of pointing gestures and gaze (as made by dolphins or humans), [74] [75] mirror self-recognition, [76] [77] and numerical values. [78]

Tool use and culture

At least some wild bottlenose dolphins use tools. In Shark Bay, off Western Australia, dolphins place a marine sponge on their rostrum, presumably to protect it when searching for food on the sandy sea bottom. [79] This has only been observed in this bay (first in 1997), and is predominantly practiced by females. A 2005 study showed mothers most likely teach the behavior to their offspring, evincing culture (behavior learned from other species members). [80] [81]

Mud plume feeding is a feeding technique performed by a small community of bottlenose dolphins over shallow seagrass beds (less than 1 m) in the Florida Keys in the United States. The behavior involves creation of a U-shaped plume of mud in the water column and then rushing through the plume to capture fish. [82]

Along the beaches and tidal marshes of South Carolina and Georgia in the United States, bottlenose dolphins cooperatively herd prey fish onto steep and sandy banks in a practice known as "strand feeding". Groups of between two and six dolphins are regularly observed creating a bow wave to force the fish out of the water. The dolphins follow the fish, stranding themselves briefly, to eat their prey before twisting their bodies back and forth in order to slide back into the water. [83] While initially documented in South Carolina and Georgia, strand feeding has also been observed in Louisiana, Texas, Baja California, Ecuador, and Australia. [84]

Some Mauritanian dolphins cooperate with human fishermen. The dolphins drive a school of fish towards the shore, where humans await with nets. In the confusion of casting nets, the dolphins catch a large number of fish as well. Intraspecies cooperative foraging has also been observed. These behaviors may also be transmitted via teaching. Controversially, Rendell and Whitehead have proposed a structure for the study of cetacean culture. [85] [86] Similar cases have been observed in Laguna, Santa Catarina in Brazil since during 19th century as well. [87] [88]

Near Adelaide, in South Australia, several bottlenose dolphins "tail-walk", whereby they elevate the upper part of their bodies vertically out of the water, and propel themselves along the surface with powerful tail movements. Tail-walking mostly arises via human training in dolphinaria. In the 1980s, a female from the local population was kept at a local dolphinarium for three weeks, and the scientist suggests she copied the tail-walking behavior from other dolphins. Two other wild adult female dolphins copied it from her, [89] and the behaviour has continued through generations until 2022. [90] [91] [92]

A study conducted by the University of Chicago showed that bottlenose dolphins can remember whistles of other dolphins they had lived with after 20 years of separation. Each dolphin has a unique whistle that functions like a name, allowing the marine mammals to keep close social bonds. The new research shows that dolphins have the longest memory yet known in any species other than humans. [93] [90]

The bottlenose dolphins of John's Pass in Boca Ciega Bay, St. Petersburg, Florida, exhibit a rare form of self-decoration and social object use called grass-wearing. Self-decoration by wearing grass appears to be an attention-getting device rather than purely play and varies from a single blade to large clusters of grass. John's Pass dolphins self-decorate with grass primarily when they form new social groups or engage in procreative activities. Grass-wearing behavior among these dolphins is a local behavioral tradition that could constitute a cultural difference from other communities. [94]

Cortical neurons

Some researchers hypothesize that the number of nerve cells (neurons) in the cortex of the brain predicts intelligence in mammals. [95] A 2019 study estimated the number of neurons in the cerebral cortex of three common bottlenose dolphins and found numbers ranging from 11.7 to 15.2 billion neurons. [96] The human average being approximately 16 billion, this is likely within the range found in the human population. [97]

Life history

Bottlenose dolphins have a lifespan of 40–60 years. Females can outlive males and live for 60 years or more. Dolphins start to reproduce aged 5 to 15 years. [98]

Respiration and sleep

The bottlenose dolphin has a single blowhole located on the dorsal surface of the head consisting of a hole and a muscular flap. The flap is closed during muscle relaxation and opens during contraction. [99] Dolphins are voluntary breathers, who must deliberately surface and open their blowholes to get air. They can store almost twice as much oxygen in proportion to their body weight as a human can: the dolphin can store 36 milliliters (ml) of oxygen per kg of body weight, compared with 20 ml per kg for humans. This is an adaptation to diving. [100] The bottlenose dolphin typically rises to the surface to breathe through its blowhole two to three times per minute, [45] although it can remain submerged for up to 20 minutes. [101]

Dolphins can breathe while "half-asleep". During the sleeping cycle, one brain hemisphere remains active, while the other hemisphere shuts down. The active hemisphere handles surfacing and breathing behavior. [102] The daily sleeping cycle lasts for about 8 hours, in increments of minutes to hours. During the sleeping cycle, they remain near the surface, swimming slowly or "logging", and occasionally closing one eye. [101]

Reproduction

Mother and juvenile bottlenose dolphins head to the seafloor Bottlenose dolphin mother and juvenile.jpg
Mother and juvenile bottlenose dolphins head to the seafloor

Both sexes have genital slits on the underside of their bodies. The male can retract and conceal his penis through his slit. [103] [104] The female's slit houses her vagina and anus. Females have two mammary slits, each housing one nipple, one on each side of the genital slit. [105] The ability to stow their reproductive organs (especially in males) allows for maximum hydrodynamics. The breeding season produces significant physiological changes in males. At that time, the testes enlarge, enabling them to hold more sperm. Large amounts of sperm allow a male to wash away the previous suitor's sperm, while leaving some of his own for fertilization. Also, sperm concentration markedly increases. Having less sperm for out-of-season social mating means it wastes less. This suggests sperm production is energetically expensive. Males have large testes in relation to their body size. [106]

During the breeding season, males compete for access to females. Such competition can take the form of fighting other males or of herding females to prevent access by other males. [107] [108] Male Sarasota Bay common bottlenose dolphins with the defensive advantages of male pair-bonding range more widely than unpaired males, and encounter more unrelated females. [109]

In Shark Bay, male Indo-Pacific bottlenose dolphins have been observed working in pairs or larger groups to follow and/or restrict the movement of a female for weeks at a time, waiting for her to become sexually receptive. [107] [110] These coalitions, also known as male reproductive alliances, will fight with other coalitions for control of females. [110] Humans and bottlenose dolphins are the only species that share this type of "gang formation" habit as a form of cooperation. [111]

Mating occurs belly to belly. [108] Dolphins have been observed engaging in intercourse when the females are not in their estrous cycles and cannot produce young, suggesting they may mate for pleasure. [112] [113] The gestation period averages 12 months. [22] Births can occur at any time of year, although peaks occur in warmer months. [3] The young are born in shallow water, sometimes assisted by a (possibly male) "midwife", and usually only a single calf is born. [114] Twins are possible, but rare. Newborn bottlenose dolphins are 0.8 to 1.4 m (2.6 to 4.6 ft) long and weigh 9 to 30 kg (20 to 66 lb), with Indo-Pacific bottlenose dolphin infants being generally smaller than common bottlenose dolphin infants. [22] To accelerate nursing, the mother can eject milk from her mammary glands. The calf suckles for 18 months to up to 8 years, [115] and continues to closely associate with its mother for several years after weaning. [37] Females sexually mature at ages 5–13, males at ages 9–14. [3] Females reproduce every two to six years. Reproduction is moderately seasonal (September–January), peaking from October to December. Calf loss between August and December is followed by rapid conception (1–2 months), whereas conception is delayed (2–9 months) if calf loss occurs between January and July. Weaning ages ranged from 2.7 to 8.0 years, but 66.7% (42 calves) were weaned by their fourth birthday. Females tended to wean mid-pregnancy. Group size was unrelated to water depth or female reproductive success, but reproductive success was predicted by water depth. Shallow water may allow mothers and calves to detect and avoid predatory sharks. Alternatively, or additionally, prey density may be higher in shallow water compared to deep water. [22]

Georgetown University professor Janet Mann argues the strong personal behavior among male calves is about bond formation and benefits the species in an evolutionary context. She cites studies showing these dolphins as adults are inseparable, and that early bonds aid protection, as well as in locating females. [116]

Female bottlenose dolphins have to expend additional energy in carrying out parental care, e.g., infant-carrying behavior. Dolphins do not physically hold their infants but line up in an echelon position with infants swimming beside them. This position creates a change of water flow pattern from the infant which minimizes separation between the mother and infant, but also increases the mother's surface area and creates a drag for the swimmer. This also leaves less energy to use in swimming speed, foraging, and predator evasion. [117]

Social interaction

An adult female bottlenose dolphin with her young, Moray Firth, Scotland Bottlenose dolphin with young.JPG
An adult female bottlenose dolphin with her young, Moray Firth, Scotland

Adult males live mostly alone or in groups of two to three, and join pods for short periods of time. Adult females and young dolphins normally live in groups of up to 15 animals. [22] Males give strong mutual support if other males help them, even if they are not friends. [118] However, they live in fission-fusion societies of varying group size, within which individuals change associations, often on a daily or hourly basis. [119] [120] Group compositions are usually determined by sex, age, reproductive condition, familial relations and affiliation histories. In a dolphin community near Sarasota, Florida, the most common group types are adult females with their recent offspring, older subadults of both sexes, and adult males either alone or in bonded pairs. [121] Smaller groups can join to form larger groups of 100 or more, and occasionally exceed 1,000. [22] [122] The social strategies of marine mammals such as bottlenose dolphins "provide interesting parallels" with the social strategies of elephants and chimpanzees. [123] : 519 

Bottlenose dolphins studied by Bottlenose Dolphin Research Institute researchers off the island of Sardinia show random social behavior while feeding, and their social behavior does not depend on feeding activity. [124] In Sardinia, the presence of a floating marine fin-fish farm has been linked to a change in bottlenose dolphin distribution as a result of high fish density around the floating cages in the farming area. [125]

Ecology

Feeding

Fish is one of the main items in the dolphin diet. They also eat shrimps, squid, mollusks, and cuttlefish, and only swallow the soft parts. They eat 22 pounds of fish a day. When they encounter a shoal of fish, they work as a team to herd them towards the shore to maximize the harvest. [22] They also hunt alone, often targeting bottom-dwelling species. The bottlenose dolphin sometimes hits a fish with its fluke, sometimes knocking it out of the water, using a strategy called "fish whacking". [38] [126] "Strand feeding" is an inherited feeding technique used by bottlenose dolphins near and around coastal regions of Georgia and South Carolina. When a pod finds a school of fish, they will circle the school and trap the fish in a mini whirlpool. Then, the dolphins will charge at the school and push their bodies up onto a mud-flat, forcing the fish on the mud-flat, as well. The dolphins then crawl around on their sides, consuming the fish they washed up on shore. This happens only during low tides. [127]

One type of feeding behavior seen in bottlenose dolphins is mud ring feeding. [128]

Bottlenose dolphins conflict with small-scale coastal commercial fisheries in some Mediterranean areas. Common bottlenose dolphins are probably attracted to fishing nets because they offer a concentrated food source. [129]

Relations with other species

A bottlenose dolphin attacks and kills a harbour porpoise at Chanonry Point, Scotland 2005-05-n2-2550.jpg
A bottlenose dolphin attacks and kills a harbour porpoise at Chanonry Point, Scotland

Dolphins can exhibit altruistic behaviour toward other sea creatures. On Mahia Beach, New Zealand, on March 10, 2008, [130] two pygmy sperm whales, a female and calf, stranded on the beach. Rescuers attempted to refloat them four times. Shortly, a playful bottlenose dolphin known to local residents as Moko arrived and, after apparently vocalizing at the whales, led them 200 m (660 ft) along a sandbar to the open sea, saving them from imminent euthanasia. [131] In 2019 a female was observed caring for a juvenile melon-headed whale, the first reported instance of a bottlenose dolphin adopting a non-conspecific infant. [132]

The bottlenose dolphin can behave aggressively. Males fight for rank and access to females. During mating season, males compete vigorously with each other through displays of toughness and size, with a series of acts, such as head-butting. They display aggression towards sharks and smaller dolphin species. At least one population, off Scotland, has practiced infanticide, and also has attacked and killed harbour porpoises. University of Aberdeen researchers say the dolphins do not eat their victims, but are simply competing for food. [133] However, Dr. Read of Duke University, a porpoise expert researching similar cases of porpoise killings that had occurred in Virginia in 1996 and 1997, holds a different view. He states dolphins and porpoises feed on different types of fish, thus food competition is an unlikely cause of the killings. [134] Similar behaviour has been observed in Ireland. [135] In the first half of July 2014, four attacks with three porpoise fatalities were observed and caught on video by the Cardigan Bay Marine Wildlife Centre in the Cardigan Bay, Wales. [136]

The bottlenose dolphin sometimes forms mixed species groups with other species from the dolphin family, particularly larger species, such as the short-finned pilot whale, the false killer whale and Risso's dolphin. [107] [137] [138] They also interact with smaller species, such as the Atlantic spotted dolphin and the rough-toothed dolphin. [107] [139] While interactions with smaller species are sometimes affiliative, they can also be hostile. [107]

Predators

Some large shark species, such as the tiger shark, the dusky shark, the great white shark and the bull shark, prey on the bottlenose dolphin, especially calves. [108] [140] [141] [142] [143] The bottlenose dolphin is capable of defending itself by charging the predator; dolphin 'mobbing' behavior of sharks can occasionally prove fatal for the shark. [140] Targeting a single adult dolphin can be dangerous for a shark of similar size. Killer whale populations in New Zealand and Peru have been observed preying on bottlenose dolphins, but this seems rare, [140] and other orcas may swim with dolphins. Swimming in pods allows dolphins to better defend themselves against predators. Bottlenose dolphins either use complex evasive strategies to outswim their predators, or mobbing techniques to batter the predator to death or force it to flee. [144]

Relation to humans

Interaction

At Notojima Aquarium, Japan Bottlenose Dolphin -Notojima Aquarium -Ishikawa -Japan-8a.jpg
At Notojima Aquarium, Japan

The species sometimes shows curiosity towards humans in or near water. Occasionally, they rescue injured divers by raising them to the surface. They also do this to help injured members of their own species. [140] In November 2004, a dramatic report of dolphin intervention came from New Zealand. Four lifeguards, swimming 100 m (330 ft) off the coast near Whangārei, were approached by a shark (reportedly a great white shark). Bottlenose dolphins herded the swimmers together and surrounded them for 40 minutes, preventing the shark from attacking, as they slowly swam to shore. [145]

In coastal regions, dolphins run the risk of colliding with boats. Researchers of the Bottlenose Dolphin Research Institute first quantified data about solitary bottlenose dolphin diving behavior in the presence and absence of boats. Dolphins responded more to tourist than fishing vessels. Driving behavior, speed, engine type and separation distance all affected dolphin safety. [146]

However, dolphins in these areas can also coexist with humans. For example, in the town of Laguna in south Brazil, a pod of bottlenose dolphins resides in the estuary, and some of its members cooperate with humans. These cooperating dolphins are individually recognized by the local fishermen, who name them. The fishermen typically stand up to their knees in the shallow waters or sit in canoes, waiting for the dolphins. Now and then, one or more dolphins appear, driving the fish towards the line of fishermen. One dolphin then displays a unique body movement outside the water, which serves as a signal to the fishermen to cast their nets (the entire sequence is shown here, [88] and a detailed description of the signal's characteristics is available here [147] ). In this unique form of cooperation, the dolphins gain because the fish are disoriented and because the fish cannot escape to shallow water where the larger dolphins cannot swim. Likewise, studies show that fishermen casting their nets following the unique signal catch more fish than when fishing alone, without the help of the dolphins. [148] The dolphins were not trained for this behavior; the collaboration began before 1847. Similar cooperative fisheries also exist in Mauritania, Africa. [149]

Commercial 'dolphin encounter' enterprises and tours operate in many countries. The documentary film The Cove documents how dolphins are captured and sold to some of these enterprises (particularly in Asia) while the remaining pod is slaughtered. In addition to such endeavors, the individuals swim with and surface near surfers at the beach. [150] Bottlenose dolphins perform in many aquaria, generating controversy. Animal welfare activists and certain scientists have claimed that the dolphins do not have adequate space or receive adequate care or stimulation. [151] However, others, notably SeaWorld, counter by claiming that the dolphins are properly cared for, have much environmental stimulation and enjoy interacting with humans. [140] [152]

Eight bottlenose dolphins that lived at the Marine Life Aquarium in Gulfport, Mississippi were swept away from their aquarium pool during Hurricane Katrina. They were later found in the Gulf of Mexico and returned to captivity. [153]

K-Dog, trained by the United States Navy to find mines and boobytraps underwater, leaping out of the water NMMP dolphin with locator.jpeg
K-Dog, trained by the United States Navy to find mines and boobytraps underwater, leaping out of the water

The military of the United States and Russia train bottlenose dolphins as military dolphins for wartime tasks, such as locating sea mines and detecting enemy divers. [154] [155] The U.S.'s program is the U.S. Navy Marine Mammal Program, located in San Diego. [156]

Tião was a well-known solitary male bottlenose dolphin that was first spotted in the town of São Sebastião in Brazil around 1994 and frequently allowed humans to interact with him. The dolphin became infamous for killing a swimmer and injuring many others, which later earned him the nickname "Killer Dolphin". [157]

Cultural influence

The popular television show Flipper , created by Ivan Tors, portrayed a bottlenose dolphin [158] in a friendly relationship with two boys, Sandy and Bud. A seagoing "Lassie", Flipper understood English and was a hero: "Go tell Dad we're in trouble, Flipper! Hurry!" The show's theme song contains the lyric "no one you see / is smarter than he". The television show was based on a 1963 film, with a sequel, Flipper's New Adventure (1964), and was remade as a feature film in 1996, starring Elijah Wood and Paul Hogan, as well as a second TV series running from 1995 to 2000, starring Jessica Alba. [159]

Other television appearances by bottlenose dolphins include Wonder Woman , Highway to Heaven , Dolphin Cove , seaQuest DSV , and The Penguins of Madagascar , in which a dolphin, Doctor Blowhole, is a villain. In the HBO movie Zeus and Roxanne , a female bottlenose dolphin befriends a male dog, and in Secrets of the Bermuda Triangle (1996 Ian Toynton movie), a girl named Annie (played by Lisa Jakub) swims with dolphins. Human and dolphin interaction segments, shot on location in the Florida Keys with Dolphin Research Center, are featured on Sesame Street [ citation needed ] and on a Halloween episode of The Simpsons , Treehouse of Horror XI. [160]

Dolphin Tale , directed by Charles Martin Smith, starring Nathan Gamble, Ashley Judd, Harry Connick Jr., Morgan Freeman, Cozi Zuehlsdorff and Kris Kristofferson, is based on the real-life story of the dolphin Winter, who was rescued from a crab trap in December 2005 and lost her tail, but learned to swim with a prosthetic one. [161] Dolphin Tale 2 , a sequel to the 2011 film, featured another rescued dolphin named Hope and an appearance by Bethany Hamilton. The sequel was released on September 12, 2014. [162] The NFL's Miami Dolphins uses the bottlenose dolphin as its mascot and team logo. [163] Factual descriptions of the dolphins date back into antiquity — the writings of Aristotle, Oppian and Pliny the Elder all mention the species. [3] [164]

Threats

Between 1950 and 2020, about four million of dolphins have drowned in fishing nets. Tuna fishing crews have been the most responsible for the largest number of deaths. In 1972, the U.S. government passed a law limiting the number of dolphins that could be killed yearly by tuna fishing crews. Dolphins in the United Kingdom have also been found to contain high levels of pollutants in their tissues. Heavy metals including mercury, PCBs and DDT are of great concern. These pollutants can cause harm in dolphins growth development, reproduction, and immunity. Since the mid-1990s, hundreds of dolphins have been trained to perform in shows presented by aquariums, zoos, and amusement parks. Scientists conduct various types of research to understand the dolphin's communication system. [165]

The man-made chemical perfluorooctanesulfonic acid (PFOS) may be compromising the immune system of bottlenose dolphins. [166] PFOS affects the immune system of male mice at a concentration of 91.5 ppb, [167] while PFOS has been reported in bottlenose dolphins in excess of 1 ppm. [168] High levels of metal contaminants have been measured in tissues in many areas of the globe. A recent study found high levels of cadmium and mercury in bottlenose dolphins from South Australia, [169] levels which were later found to be associated with kidney malformations, indicating possible health effects of high heavy metal concentrations in dolphins. [170]

Conservation

Bottlenose dolphin (at Hundred Islands National Park) Dolphinjf.JPG
Bottlenose dolphin (at Hundred Islands National Park)

Bottlenose dolphins are not endangered. Their future is stable because of their abundance and adaptability. However, specific populations are threatened due to various environmental changes. The population in the Moray Firth in Scotland is estimated to consist of around 190 individuals, and are under threat from harassment, traumatic injury, water pollution and reduction in food availability. [171] Likewise, an isolated population in Doubtful Sound, New Zealand, is in decline due to calf loss coincident to an increase in warm freshwater discharge into the fiord. [172] Less local climate change, such as increasing water temperature may also play a role but has never been shown to be the case. [173] One of the largest coastal populations of bottlenose dolphins in Shark Bay, Western Australia was forecast to be stable with little variation in mortality over time (Manlik et al. 2016). [174]

In United States waters, hunting and harassing of marine mammals is forbidden in almost all circumstances, from passage of the Marine Mammal Protection Act of 1972. [175]

See also

Related Research Articles

<span class="mw-page-title-main">Cetacea</span> Infraorder of mammals

Cetacea is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel themselves through the water with powerful up-and-down movement of their tail which ends in a paddle-like fluke, using their flipper-shaped forelimbs to maneuver.

<span class="mw-page-title-main">Dolphin</span> Marine mammals, closely related to whales and porpoises

A dolphin is an aquatic mammal in the clade Odontoceti. Dolphins belong to the families Delphinidae, Platanistidae, Iniidae, Pontoporiidae, and possibly extinct Lipotidae. There are 40 extant species named as dolphins.

<span class="mw-page-title-main">Marine mammal</span> Mammals that rely on marine environments for feeding

Marine mammals are mammals that rely on marine (saltwater) ecosystems for their existence. They include animals such as cetaceans, pinnipeds, sirenians, sea otters and polar bears. They are an informal group, unified only by their reliance on marine environments for feeding and survival.

<span class="mw-page-title-main">Blubber</span> Thick layer of animal body fat

Blubber is a thick layer of vascularized adipose tissue under the skin of all cetaceans, pinnipeds, penguins, and sirenians. It was present in many marine reptiles, such as ichthyosaurs and plesiosaurs.

<span class="mw-page-title-main">Risso's dolphin</span> Species of marine mammal

Risso's dolphin is a marine mammal and dolphin, the only species of the genus Grampus. Some of the most closely related species to these dolphins include: pilot whales, pygmy killer whales, melon-headed whales, and false killer whales. These dolphins grow to be about 10 ft in length and can be identified by heavy scarring that appears white. They are located worldwide in cold to temperate waters, but most typically found along continental shelves due to their eating habits. Risso's dolphins have a diet that contains primarily cephalopods. They are able to search for prey at various depths due to their ability to reach depths of almost 600m. Individuals typically travel in pods ranging anywhere from 10 to 50 dolphins, with which they form tight social bonds.

<span class="mw-page-title-main">Oceanic dolphin</span> Family of marine mammals

Oceanic dolphins or Delphinidae are a widely distributed family of dolphins that live in the sea. Close to forty extant species are recognised. They include several big species whose common names contain "whale" rather than "dolphin", such as the Globicephalinae. Delphinidae is a family within the superfamily Delphinoidea, which also includes the porpoises (Phocoenidae) and the Monodontidae. River dolphins are relatives of the Delphinoidea.

<span class="mw-page-title-main">Toothed whale</span> Parvorder of cetaceans

The toothed whales are a clade of cetaceans that includes dolphins, porpoises, and all other whales with teeth, such as beaked whales and the sperm whales. 73 species of toothed whales are described. They are one of two living groups of cetaceans, the other being the baleen whales (Mysticeti), which have baleen instead of teeth. The two groups are thought to have diverged around 34 million years ago (mya).

<span class="mw-page-title-main">Cetacean intelligence</span> Intellectual capacity of cetaceans

Cetacean intelligence is the overall intelligence and derived cognitive ability of aquatic mammals belonging in the infraorder Cetacea (cetaceans), including baleen whales, porpoises, and dolphins. In 2014, a study found for first time that the long-finned pilot whale has more neocortical neurons than any other mammal, including humans, examined to date.

<span class="mw-page-title-main">Common dolphin</span> Species of mammal

The common dolphin is the most abundant cetacean in the world, with a global population of about six million. Despite this fact and its vernacular name, the common dolphin is not thought of as the archetypal dolphin, with that distinction belonging to the bottlenose dolphin due to its popular appearances in aquaria and the media. However, the common dolphin is often depicted in Ancient Greek and Roman art and culture, most notably in a mural painted by the Greek Minoan civilization.

<span class="mw-page-title-main">False killer whale</span> Species of oceanic dolphin in the genus Pseudorca

The false killer whale is a species of oceanic dolphin that is the only extant representative of the genus Pseudorca. It is found in oceans worldwide but mainly in tropical regions. It was first described in 1846 as a species of porpoise based on a skull, which was revised when the first carcasses were observed in 1861. The name "false killer whale" comes from having a skull similar to the orca, or killer whale.

<span class="mw-page-title-main">Indo-Pacific bottlenose dolphin</span> Species of mammal

The Indo-Pacific bottlenose dolphin is a species of bottlenose dolphin. This dolphin grows to 2.6 m (8.5 ft) long, and weighs up to 230 kg (510 lb). It lives in the waters around India, northern Australia, South China, the Red Sea, and the eastern coast of Africa. Its back is dark grey and its belly is lighter grey or nearly white with grey spots.

<span class="mw-page-title-main">Humpback dolphin</span> Genus of mammals

Humpback dolphins are members of the genus Sousa. These dolphins are characterized by the conspicuous humps and elongated dorsal fins found on the backs of adults of the species. Humpback dolphins inhabit shallow nearshore waters along coastlines across Australia, Africa, and Asia. Their preference for these habitats exposes them to various human activities such as fisheries entanglement, boat traffic, pollution, and habitat loss. Despite these risks, their nearshore presence facilitates easy observation from land.

<span class="mw-page-title-main">Melon-headed whale</span> Species of mammal

The melon-headed whale, also known less commonly as the electra dolphin, little killer whale, or many-toothed blackfish, is a toothed whale of the oceanic dolphin family (Delphinidae). The common name is derived from the head shape. Melon-headed whales are widely distributed throughout deep tropical and subtropical waters worldwide, but they are rarely encountered at sea. They are found near shore mostly around oceanic islands, such as Hawaii, French Polynesia, and the Philippines.

<span class="mw-page-title-main">Atlantic spotted dolphin</span> Species of mammal

The Atlantic spotted dolphin is a dolphin found in warm temperate and tropical waters of the Atlantic Ocean. Older members of the species have a very distinctive spotted coloration all over their bodies.

<span class="mw-page-title-main">Common bottlenose dolphin</span> Species of dolphin

The common bottlenose dolphin or Atlantic bottlenose dolphin is one of three species of bottlenose dolphin in the genus Tursiops. The common bottlenose dolphin is a very familiar dolphin due to the wide exposure it receives in human care in marine parks and dolphinariums, and in movies and television programs. Common bottlenose dolphins inhabit temperate and tropical oceans throughout the world, absent only from polar waters. While formerly known simply as the bottlenose dolphin, this term is now applied to the genus Tursiops as a whole. As considerable genetic variation has been described within this species, even between neighboring populations, many experts think additional species may be recognized.

<span class="mw-page-title-main">Cetacean surfacing behaviour</span> Cetacean movement types

Cetacean surfacing behaviour is a grouping of movement types that cetaceans make at the water's surface in addition to breathing. Cetaceans have developed and use surface behaviours for many functions such as display, feeding and communication. All regularly observed members of the order Cetacea, including whales, dolphins and porpoises, show a range of surfacing behaviours.

<span class="mw-page-title-main">Evolution of cetaceans</span>

The evolution of cetaceans is thought to have begun in the Indian subcontinent from even-toed ungulates (Artiodactyla) 50 million years ago (mya) and to have proceeded over a period of at least 15 million years. Cetaceans are fully aquatic mammals belonging to the order Artiodactyla and branched off from other artiodactyls around 50 mya. Cetaceans are thought to have evolved during the Eocene, the second epoch of the present-extending Cenozoic Era. Molecular and morphological analyses suggest Cetacea share a relatively recent closest common ancestor with hippopotami and that they are sister groups. Being mammals, they surface to breathe air; they have five finger bones (even-toed) in their fins; they nurse their young; and, despite their fully aquatic life style, they retain many skeletal features from their terrestrial ancestors. Research conducted in the late 1970s in Pakistan revealed several stages in the transition of cetaceans from land to sea.

The Bottlenose Dolphin Research Institute (BDRI) is a research and educational centre dedicated to the understanding and conservation of cetaceans and the marine environment in which they live. The Institute's BDRI center was founded by the biologist Bruno Díaz López in Sardinia, Italy in 2005. In 2014, the BDRI opened a new facility in Galicia, Spain.

<span class="mw-page-title-main">Burrunan dolphin</span> Subspecies of mammal

The Burrunan dolphin is a proposed species of bottlenose dolphin found in parts of Victoria, Australia first described in 2011. Its exact taxonomy is debated: numerous studies support it as being a separate species within the genus Tursiops and occupying a basal position within the genus, with limited phylogenetic studies using different methodologies indicate that it is a subspecies of the Indo-Pacific bottlenose dolphin. The Burrunan dolphin is not currently recognized as a species by the Society for Marine Mammalogy or American Society of Mammalogists, which cites problematic methodology in the original study proposing species status and recommends further research.

References

  1. 1 2 "Fossilworks: Tursiops miocaenus". Paleobiology Database . Archived from the original on January 8, 2023. Retrieved December 17, 2021.
  2. 1 2 Wells, R.S.; Natoli, A.; Braulik, G. (2019) [amended version of 2019 assessment]. "Tursiops truncatus". IUCN Red List of Threatened Species . 2019: e.T22563A156932432. doi: 10.2305/IUCN.UK.2019-1.RLTS.T22563A156932432.en . Retrieved October 31, 2023.
  3. 1 2 3 4 Wells, R.; Scott, M. (2002). "Bottlenose Dolphins". In Perrin, W.; Wursig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. pp.  122–127. ISBN   978-0-12-551340-1.
  4. ↑ "Common Bottlenose Dolphin (Tursiops Truncatus) - Dolphin Facts and Information". www.dolphins-world.com. Retrieved July 13, 2017.
  5. 1 2 "List of Marine Mammal Species and Subspecies". MarineMammalScience.org. Society for Marine Mammalogy. June 2023.
  6. 1 2 "Tursiops aduncus (Hemprich & Ehrenberg, 1832)". www.mammaldiversity.org. Retrieved September 5, 2021.
  7. ↑ Wells, R.S.; Scott, Michael (January 1, 2009). "Common bottlenose dolphin (Tursiops truncatus)". Encyclopedia of Marine Mammals. 6: 249–255. doi:10.1016/B978-0-12-373553-9.00062-6.
  8. ↑ Krützen, M.; Kreicker, S.; MacLeod, C.D.; Learmonth, J.; Kopps, A.M.; Walsham, P.; Allen, S.J. (2014). "Cultural transmission of tool use by Indo-Pacific bottlenose dolphins (Tursiops sp.) provides access to a novel foraging niche". Proceedings of the Royal Society B . 281 (1784): 1–9. doi:10.1098/rspb.2014.0374. PMC   4043097 . PMID   24759862.
  9. ↑ Osvaldo, Cairo (October 4, 2011). "External Measures of Cognition". Frontiers in Human Neuroscience. 5 (108): 108. doi: 10.3389/fnhum.2011.00108 . PMC   3207484 . PMID   22065955. Table 1
  10. ↑ Marino, Lori (2004). "Cetacean Brain Evolution: Multiplication Generates Complexity" (PDF). International Society for Comparative Psychology (17). The International Society for Comparative Psychology: 1–16. Archived from the original (PDF) on March 10, 2011.
  11. ↑ Natoli, Ada; Peddemors, Victor M.; Rus Hoelzel, A. (March 1, 2004). "Population structure and speciation in the genus Tursiops based on microsatellite and mitochondrial DNA analyses". Journal of Evolutionary Biology. 17 (2): 363–375. doi: 10.1046/j.1420-9101.2003.00672.x . ISSN   1420-9101. PMID   15009270. S2CID   19615055.
  12. ↑ Rice, Dale W (1998). Marine mammals of the world: systematics and distribution (Special Publication). Society of Marine Mammalogy. ISBN   978-1-891276-03-3.
  13. ↑ Charlton-Robb, Kate; Gershwin, Lisa-ann; Thompson, Ross; Austin, Jeremy; Owen, Kylie; McKechnie, Stephen (September 14, 2011). Fleischer, Robert C. (ed.). "A New Dolphin Species, the Burrunan Dolphin Tursiops australis sp. nov., Endemic to Southern Australian Coastal Waters". PLOS ONE. 6 (9): e24047. Bibcode:2011PLoSO...624047C. doi: 10.1371/journal.pone.0024047 . ISSN   1932-6203. PMC   3173360 . PMID   21935372.
  14. ↑ Charlton-Robb, K.; Taylor, A. C.; McKechnie, S. W. (February 2015). "Population genetic structure of the Burrunan dolphin (Tursiops australis) in coastal waters of south-eastern Australia: conservation implications". Conservation Genetics. 16 (1): 195–207. Bibcode:2015ConG...16..195C. doi:10.1007/s10592-014-0652-6. ISSN   1566-0621. S2CID   16178397.
  15. ↑ Wickert, Janaína Carrion; von Eye, Sophie Maillard; Oliveira, Larissa Rosa; Moreno, Ignacio Benites (December 5, 2016). "Revalidation of Tursiops gephyreus Lahille, 1908 (Cetartiodactyla: Delphinidae) from the southwestern Atlantic Ocean". Journal of Mammalogy. 97 (6): 1728–1737. doi: 10.1093/jmammal/gyw139 . ISSN   0022-2372.
  16. ↑ Hohl, Leandro S. L.; Sicuro, Fernando L.; Wickert, Janaína C.; Moreno, Ignacio B.; Rocha-Barbosa, Oscar; Barreto, André S. (April 6, 2020). "Skull morphology of bottlenose dolphins from different ocean populations with emphasis on South America". Journal of Morphology. 281 (6): 564–577. doi:10.1002/jmor.21121. PMID   32249999. S2CID   214808512.
  17. ↑ Oliveira, Larissa Rosa de; Fraga, Lúcia D; Ott, Paulo H; Siciliano, Salvatore; Lopes, Fernando; Almeida, Raquel; Wickert, Janaína C; Milmann, Lucas; Danilewicz, Daniel; Emin-Lima, Neusa Renata; Meirelles, Ana Carolina (April 24, 2019). "Population structure, phylogeography, and genetic diversity of the common bottlenose dolphin in the tropical and subtropical southwestern Atlantic Ocean". Journal of Mammalogy. 100 (2): 564–577. doi:10.1093/jmammal/gyz065. hdl: 10923/20559 . ISSN   0022-2372.
  18. ↑ Costa, Ana P. B.; Rosel, Patricia E.; Daura-Jorge, Fábio G.; Simões-Lopes, Paulo C. (October 2016). "Offshore and coastal common bottlenose dolphins of the western South Atlantic face-to-face: What the skull and the spine can tell us". Marine Mammal Science. 32 (4): 1433–1457. Bibcode:2016MMamS..32.1433C. doi:10.1111/mms.12342.
  19. ↑ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. ISBN   0-801-88221-4. OCLC   62265494.
  20. ↑ Mead, J. G.; Brownell, R. L. Jr. (2005). "Order Cetacea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 723–743. ISBN   978-0-8018-8221-0. OCLC   62265494.
  21. ↑ Costa, A. P. B.; Archer, F. I.; Rosel, P. E.; Perrin, W. F. (March 2023). "Tursiops truncatus nuuanu, a new subspecies of the common bottlenose dolphin from the eastern tropical Pacific". Journal of Mammalian Evolution. 30: 213–229. doi:10.1007/s10914-022-09641-5.
  22. 1 2 3 4 5 6 7 8 Shirihai, H.; Jarrett, B. (2006). Whales Dolphins and Other Marine Mammals of the World. Princeton: Princeton Univ. Press. pp. 155–161. ISBN   978-0-691-12757-6.
  23. 1 2 "Bottlenose Dolphin (Tursiops truncatus): Western North Atlantic Offshore Stock" (PDF). Retrieved September 30, 2008.
  24. ↑ Costa, Ana; McFee, Wayne; Wilcox, Lynsey; Archer, Frederick; Rosel, Patricia (2022). "The common bottlenose dolphin (Tursiops truncatus) ecotypes of the western North Atlantic revisited: an integrative taxonomic investigation supports the presence of distinct species". Zoological Journal of the Linnean Society. 196 (4): 1608–1636. doi:10.1093/zoolinnean/zlac025.
  25. ↑ Leduc, R.; Perrin, W.; Dizon, E. (August 18, 1998). "Phylogenetic Relationships among the Delphinid Cetaceans Based on Full Cytochrome B Sequences". Marine Mammal Science. 15 (3): 619–648. doi:10.1111/j.1748-7692.1999.tb00833.x.
  26. ↑ Moura, Andre E.; Shreves, Kypher; Pilot, Małgorzata; Andrews, Kimberly R.; Moore, Daniel M.; Kishida, Takushi; Möller, Luciana; Natoli, Ada; Gaspari, Stefania; McGowen, Michael; Chen, Ing; Gray, Howard; Gore, Mauvis; Culloch, Ross M.; Kiani, Muhammad S.; Willson, Maia Sarrouf; Bulushi, Asma; Collins, Tim; Baldwin, Robert; Willson, Andrew; Minton, Gianna; Ponnampalam, Louisa; Hoelzel, A. Rus (May 1, 2020). "Phylogenomics of the genus Tursiops and closely related Delphininae reveals extensive reticulation among lineages and provides inference about eco-evolutionary drivers". Molecular Phylogenetics and Evolution. 146: 106756. Bibcode:2020MolPE.14606756M. doi:10.1016/j.ympev.2020.106756. hdl: 2164/16438 . ISSN   1055-7903. PMID   32028032. S2CID   211048062.
  27. ↑ Reeves, R.; Stewart, B.; Clapham, P.; Powell, J. (2002). Guide to Marine Mammals of the World. New York: A.A. Knopf. p.  422. ISBN   978-0-375-41141-0.
  28. ↑ "Risso's Dolphin". American Cetacean Society. Archived from the original on May 17, 2008. Retrieved September 20, 2008.
  29. ↑ Lee, Jaennette (April 15, 2005). "Whale-Dolphin Hybrid Has Baby 'Wholphin'". Associated Press. Retrieved September 20, 2008.
  30. ↑ "The Mammals of Texas – Rough-toothed Dolphin". Archived from the original on September 15, 2008. Retrieved September 20, 2008.
  31. ↑ "Robin's Island Database about captive Dolphins and Whales". Archived from the original on January 23, 2009. Retrieved September 20, 2008.
  32. ↑ Zornetzer H.R.; Duffield D.A. (2003). "Captive-born bottlenose dolphin × common dolphin (Tursiops truncatus × Delphinus capensis) intergeneric hybrids". Canadian Journal of Zoology. 81 (10): 1755–1762. Bibcode:2003CaJZ...81.1755Z. doi:10.1139/z03-150.
  33. ↑ Herzing, D.; Moewe, K. & Brunnick, B. (2003). "Interspecies interactions between Atlantic spotted dolphins, Stenella frontalis and bottlenose dolphins, Tursiops truncatus, on Great Bahama Bank, Bahamas" (PDF). Aquatic Mammals. 29 (3): 335–341. doi:10.1578/01675420360736505. Archived from the original (PDF) on June 14, 2007. Retrieved September 20, 2008.
  34. ↑ "Evolution of Dolphins". Dolphin Way.
  35. ↑ "Fossilworks: Tursiops osennae". Paleobiology Database .
  36. ↑ American Cetacean Society Fact Sheet – Bottlenose Dolphin Archived 2008-07-25 at the Wayback Machine
  37. 1 2 3 4 Reeves, R.; Stewart, B.; Clapham, P.; Powell, J. (2002). National Audubon Society Guide to Marine Mammals of the World. New York: A. A. Knopf. pp.  362–365. ISBN   978-0-375-41141-0.
  38. 1 2 "Office of Protected Resources – Bottlenose Dolphin (Tursiops truncatus)". noaa.gov. September 16, 2019.
  39. ↑ team, facts.co (September 29, 2017). "Bottlenose dolphin facts". Bottlenose dolphin facts. Archived from the original on August 13, 2018. Retrieved March 3, 2018.
  40. ↑ "The Life Cycle of Bottlenose Dolphins". Sciencing. Retrieved March 3, 2018.
  41. 1 2 "Bottlenose Dolphin". March 26, 2014. Archived from the original on February 11, 2017. Retrieved September 29, 2016.
  42. 1 2 "Bottlenose Dolphin Tursiops truncatus at MarineBio.org". marinebio.org. Archived from the original on July 13, 2012. Retrieved January 26, 2005.
  43. ↑ Morteo, Eduardo; Rocha-Olivares, Axayácatl; Morteo, Rodrigo; Weller, David W. (June 13, 2017). "Phenotypic variation in dorsal fin morphology of coastal bottlenose dolphins (Tursiops truncatus) off Mexico". PeerJ. 5: e3415. doi: 10.7717/peerj.3415 . PMC   5472037 . PMID   28626607.
  44. ↑ Tabuchi, Hiroko (2006). "Dolphin reveals an extra set of 'legs'". NBC News . Associated Press. Archived from the original on April 19, 2013.
  45. 1 2 "Adaptations for an aquatic environment". Busch Gardens. Archived from the original on May 17, 2008. Retrieved March 14, 2008.
  46. ↑ Hersh, Sandra L.; Deborah A. Duffield (1990). "Distinction Between Northwest Atlantic Offshore and Coastal Bottlenose Dolphins Based on Hemoglobin Profile and Morphometry". In Stephen Leatherwood; Randall R. Reeves (eds.). The Bottlenose Dolphin. San Diego: Academic Press. pp. 129–139. ISBN   978-0-12-440280-5.
  47. ↑ Goforth, Harold W. Jr. (1990) "Ergometry (Exercise Testing) of the Bottlenose Dolphin." In The Bottlenose Dolphin, edited by Stephen Leatherwood and Randall R. Reeves, pp. 559–574. San Diego: Academic Press, Inc., ISBN   0-12-440280-1.
  48. ↑ Fish, F. E.; Hui, C. A. (1991). "Dolphin swimming – a review". Mammal Review. 21 (4): 181–195. doi:10.1111/j.1365-2907.1991.tb00292.x.
  49. ↑ Au, Whitlow (1993). The Sonar of Dolphins. New York: Springer-Verlag. ISBN   978-3-540-97835-0.
  50. ↑ Pack AA, Herman LM (1995). "Sensory integration in the bottlenosed dolphin: immediate recognition of complex shapes across the senses of echolocation and vision". The Journal of the Acoustical Society of America. 98 (2 Pt 1): 722–33. Bibcode:1995ASAJ...98..722P. doi:10.1121/1.413566. PMID   7642811.
  51. ↑ Bottlenose dolphins’ electric super sense could help them navigate the globe
  52. ↑ Herman, L. M.; Peacock, M. F.; Yunker, M. P.; Madsen, C. (1975). "Bottlenosed dolphin: Double-slit pupil yields equivalent aerial and underwater diurnal acuity". Science. 189 (4203): 650–652. Bibcode:1975Sci...189..650H. doi:10.1126/science.1162351. PMID   1162351.
  53. ↑ M. Mass, Alla; Y. Supin, Alexander (2007). "Adaptive features of aquatic mammals' eyes". The Anatomical Record. 290 (6): 701–715. doi: 10.1002/ar.20529 . PMID   17516421. S2CID   39925190.
  54. 1 2 3 4 "Dolphin Characteristics". Western Illinois University. Retrieved August 31, 2008.
  55. ↑ "Dolphins can recognise each other by taste of their urine, study finds". the Guardian. May 19, 2022. Retrieved May 29, 2022.
  56. ↑ Bruck, Jason N.; Walmsley, Sam F.; Janik, Vincent M. (May 20, 2022). "Cross-modal perception of identity by sound and taste in bottlenose dolphins". Science Advances. 8 (20): eabm7684. Bibcode:2022SciA....8M7684B. doi:10.1126/sciadv.abm7684. ISSN   2375-2548. PMC   9116882 . PMID   35584227.
  57. ↑ "Bottlenose Dolphin : Dolphins : Voices in the Sea". Archived from the original on April 20, 2013.
  58. ↑ "Bottlenose Dolphins: Animal information, pictures, map". National Geographic. Archived from the original on October 23, 2006. Retrieved November 3, 2006.
  59. ↑ Janik VM, Slater PJ (1998). "Context-specific use suggests that bottlenose dolphin signature whistles are cohesion calls". Animal Behaviour. 56 (4): 829–838. doi:10.1006/anbe.1998.0881. PMID   9790693. S2CID   32367435.
  60. 1 2 3 "Motherese in bottlenose dolphins". Proceedings of the National Academy of Sciences of the United States of America . September 25, 2023. Retrieved December 26, 2023.
  61. 1 2 3 4 Sayigh, Laela S.; El Haddad, Nicole; Tyack, Peter L.; Janik, Vincent M.; Wells, Randall S.; Jensen, Frants H. (July 4, 2023). "Bottlenose dolphin mothers modify signature whistles in the presence of their own calves". Proceedings of the National Academy of Sciences. 120 (27). National Academy of Sciences: e2300262120. Bibcode:2023PNAS..12000262S. doi: 10.1073/pnas.2300262120 . hdl: 10023/27844 . PMC   10318978 . PMID   37364108.
  62. ↑ Gleason, Jean Berko., and Nan Bernstein Ratner. "The Development of Language", 8th ed. Pearson, 2013.
  63. 1 2 Díaz López, B.; Shirai, J.A.B. (2009). Mediterranean common bottlenose dolphin's repertoire and communication use. Animal Science, Issues and Professions. Nova Science Publishers. pp. 129–148. ISBN   978-1-60876-849-3.
  64. ↑ Díaz López (2010). "Whistle characteristics in free-ranging bottlenose dolphins (Tursiops truncatus) in the Mediterranean Sea: Influence of behaviour". Mammalian Biology. 76 (2): 180–189. doi:10.1016/j.mambio.2010.06.006.
  65. ↑ Herman LM, Richards DG, Wolz JP (1984). "Comprehension of sentences by bottlenosed dolphins". Cognition. 16 (2): 129–219. doi:10.1016/0010-0277(84)90003-9. PMID   6540652. S2CID   43237011.
  66. ↑ Reiss D, McCowan B (1993). "Spontaneous vocal mimicry and production by bottlenose dolphins (Tursiops truncatus): evidence for vocal learning". Journal of Comparative Psychology. 107 (3): 301–12. doi:10.1037/0735-7036.107.3.301. PMID   8375147.
  67. ↑ "The Dolphin Institute – Behavioral Mimicry". Archived from the original on May 11, 2008. Retrieved August 31, 2008.
  68. ↑ Herman, L. (2002). "Language Learning". In Perrin, W.; Wursig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. pp.  685–689. ISBN   978-0-12-551340-1.
  69. ↑ The Dolphin Institute. "The Dolphin Institute – Understanding Language". dolphin-institute.org. Archived from the original on December 11, 2008.
  70. 1 2 Herman, L.; Pack, A.; Wood, A. (August 26, 2006). "Bottlenose Dolphins Can Generalize Rules and Develop Abstract Concepts". Marine Mammal Science. 10 (1): 70–80. doi:10.1111/j.1748-7692.1994.tb00390.x.
  71. ↑ "The Dolphin Institute – Awareness of One's Own Recent Behaviors". Archived from the original on May 9, 2008. Retrieved August 31, 2008.
  72. ↑ Herman LM, Gordon JA (1974). "Auditory delayed matching in the bottlenose dolphin". Journal of the Experimental Analysis of Behavior. 21 (1): 19–26. doi:10.1901/jeab.1974.21-19. PMC   1333166 . PMID   4204143.
  73. ↑ "The Dolphin Institute – Awareness of One's Own Body Parts". Archived from the original on May 11, 2008. Retrieved August 31, 2008.
  74. ↑ Foer, Joshua (2015). "It's Time for Conservation: Breaking the communication barrier between dolphins and humans". National Geographic. Archived from the original on April 19, 2015. Retrieved February 12, 2016.
  75. ↑ "The Dolphin Institute – Pointing Gestures". Archived from the original on May 9, 2008. Retrieved August 31, 2008.
  76. ↑ "Intelligence and Humans" . Retrieved August 11, 2008.
  77. ↑ Marten, K.; Psarakos, S. (1995). "Evidence of self-awareness in the bottlenose dolphin (Tursiops truncatus)". In Parker, S. T.; Mitchell, R.; Boccia, M (eds.). Self-awareness in Animals and Humans: Developmental Perspectives. Cambridge University Press. pp. 361–379. ISBN   978-0-521-44108-7. Archived from the original on October 13, 2008. Retrieved October 4, 2008.
  78. ↑ Kilian, Annette; Yaman, Sevgi; von Fersen, Lorenzo; Güntürkün, Onur (2003). "A bottlenose dolphin discriminates visual stimuli differing in numerosity" (PDF). Learning & Behavior. 31 (2): 133–142. doi: 10.3758/BF03195976 . PMID   12882372. S2CID   12368215.
  79. ↑ Smolker, R.A.; et al. (1997). "Sponge Carrying by Dolphins (Delphinidae, Tursiops sp.): A Foraging Specialization Involving Tool Use?" (PDF). Ethology. 103 (6): 454–465. Bibcode:1997Ethol.103..454S. doi:10.1111/j.1439-0310.1997.tb00160.x. hdl: 2027.42/71936 .
  80. ↑ Krutzen M, Mann J, Heithaus MR, Connor RC, Bejder L, Sherwin WB (2005). "Cultural transmission of tool use in bottlenose dolphins". Proceedings of the National Academy of Sciences . 102 (25): 8939–8943. Bibcode:2005PNAS..102.8939K. doi: 10.1073/pnas.0500232102 . PMC   1157020 . PMID   15947077.
  81. ↑ Krutzen, M.; Mann, J.; Heithaus, M. R.; Connor, R. C.; Bejder, L.; Sherwin, W. B. (2005). "Cultural transmission of tool use in bottlenose dolphins". Proceedings of the National Academy of Sciences. 102 (25): 8939–43. Bibcode:2005PNAS..102.8939K. doi: 10.1073/pnas.0500232102 . PMC   1157020 . PMID   15947077.
  82. ↑ Lewis, J.S.; Schroeder, W. (2003). "Mud plume feeding, a unique foraging behavior of the bottlenose dolphin (Tursiops truncatus) in the Florida Keys". Gulf of Mexico Science. 21 (1): 92. doi: 10.18785/goms.2101.09 .
  83. ↑ Feldman, Paula. "Dinner Is Served!". South Carolina Wildlife Magazine. Archived from the original on March 11, 2016. Retrieved March 11, 2016.
  84. ↑ Jimenez, Pedro; Alava, Juan Jose (2015). "Strand-feeding by coastal bottlenose dolphins (Tursiops truncatus) in the Gulf of Guayaquil, Ecuador". Latin American Journal of Aquatic Mammals. 10 (1): 33–37. doi: 10.5597/lajam00191 .
  85. ↑ Rendell, L.; Whitehead, H. (2001). "Culture in whales and dolphins". Behavioral and Brain Sciences. 24 (2): 309–382. doi:10.1017/S0140525X0100396X. PMID   11530544. S2CID   24052064.
  86. ↑ Premack, D.; Hauser, M. (2001). "A whale of a tale: Calling it culture doesn't help" (PDF). Behavioral and Brain Sciences. 24 (2): 350–351. doi:10.1017/S0140525X01513965. S2CID   143443845. Archived from the original (PDF) on March 6, 2009.
  87. ↑ The Daily Telegraph (2006), "Brazil's sexiest secret", article retrieved January 24, 2016.
  88. 1 2 Dr. Moti Nissani (2007) Bottlenose Dolphins in Laguna Requesting a Throw Net (video). Supporting material for Dr. Nissani's presentation at the 2007 International Ethological Conference. Video retrieved January 24, 2016.
  89. ↑ Black, Richard (2008). "Wild dolphins tail-walk on water". BBC News. Retrieved March 10, 2016.
  90. 1 2 Sutton, Malcolm (April 4, 2022). "Why are the dolphins dying?". ABC News. Australian Broadcasting Corporation . Retrieved April 4, 2022.
  91. ↑ Bossley M, Steiner A, Brakes P, Shrimpton J, Foster C, Rendell L (September 2018). "Tail walking in a bottlenose dolphin community: the rise and fall of an arbitrary cultural 'fad'". Biol. Lett. 14 (9). doi:10.1098/rsbl.2018.0314. PMC   6170752 . PMID   30185606.
  92. ↑ Pisani, Ashleigh (May 9, 2018). "The incredible tale of Billie the Port River dolphin — the world's first wild tailwalker". Adelaide Now . Portside Messenger.
  93. ↑ "Dolphins Have Longest Memories in Animal Kingdom". August 6, 2013. Archived from the original on August 10, 2013. Retrieved March 3, 2018.
  94. ↑ Weaver, A., & Kuczaj, S. (2016). Neither toy nor tool: Grass-wearing behavior among free-ranging bottlenose dolphins in western Florida. International Journal of Comparative Psychology, 29, 1-18, uclapsych_ijcp_31885. Retrieved from: http://escholarship.org/uc/item/893417x3
  95. ↑ Dicke, U.; Roth G. (August–September 2008). "Intelligence Evolved". Scientific American Mind. pp. 75–77.
  96. ↑ Ridgeway, Sam H. (December 16, 2019). "Higher neuron densities in the cerebral cortex and larger cerebellums may limit dive times of delphinids compared to deep-diving toothed whales". PLOS ONE. 14 (12): e0226206. Bibcode:2019PLoSO..1426206R. doi: 10.1371/journal.pone.0226206 . PMC   6914331 . PMID   31841529.
  97. ↑ Herculano-Houzel, Suzana (November 9, 2009). "The human brain in numbers: a linearly scaled-up primate brain". Frontiers in Human Neuroscience. 3 (12): 31. doi: 10.3389/neuro.09.031.2009 . PMC   6914331 . PMID   31841529.
  98. ↑ "Common Bottlenose Dolphin | NOAA Fisheries". December 29, 2021.
  99. ↑ "Bottlenose dolphins". Seaworld. Archived from the original on May 18, 2012. Retrieved March 14, 2008.
  100. ↑ Kooyman, G. (2002). "Diving Physiology". In Perrin, W.; Wursig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. pp.  339–341. ISBN   978-0-12-551340-1.
  101. 1 2 "Dolphin Q&A". Mia Research Foundation. Archived from the original on March 18, 2008. Retrieved March 13, 2008.
  102. ↑ "Do whales and dolphins sleep". howstuffworks. May 24, 2001. Retrieved March 13, 2008.
  103. ↑ Robeck, Todd R., et al. "Reproductive biology of the bottlenose dolphin (Tursiops truncatus) and the potential application of advanced reproductive technologies." Journal of Zoo and Wildlife Medicine (1994): 321–336.
  104. ↑ Atkinson, S. (2002). "Male Reproductive Systems". In Perrin, W.; Wursig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. p.  700. ISBN   978-0-12-551340-1.
  105. ↑ Stewart, R. (2002). "Female reproductive systems". In Perrin, W.; Wursig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. pp.  422–428. ISBN   978-0-12-551340-1.
  106. ↑ Connor Richard C.; Peterson, Dawn M. (1994). The Lives of Whales and Dolphins. New York.: Henry Holt and Company. ISBN   978-0-8050-1950-6.
  107. 1 2 3 4 5 Connor, R.; Wells, R.; Mann, J.; Read, A. (2000). "The Bottlenose Dolphin". In Mann, J.; Connor, R.; Tyack, P.; Whitehead, H (eds.). Cetacean Societies. Chicago: Univ. of Chicago Press. p.  102. ISBN   978-0-226-50341-7.
  108. 1 2 3 "Bottlenose Dolphins of Sarasota Bay". Smithsonian National Zoo. Archived from the original on February 18, 2009.
  109. ↑ Edward C.G Owen; Randall S Wells; Sue Hofmann (December 2002). "Ranging and association patterns of paired and unpaired adult male Atlantic bottlenose dolphins, Tursiops truncatus, in Sarasota, Florida, provide no evidence for alternative male strategies". Canadian Journal of Zoology . 80 (12). Canadian Science Publishing: 2072–2089. Bibcode:2002CaJZ...80.2072O. doi:10.1139/z02-195.
  110. 1 2 Connor R. C. (1990) Alliances among male bottlenose dolphins and comparative analyses of mutualism. Ph.D. Dissertation. The University of Michigan, Michigan.
  111. ↑ Guy, Jack (April 2020). "Male bottlenose dolphins form gangs to get a mate". CNN. Retrieved April 1, 2020.
  112. ↑ Volker Sommer; Paul L. Vasey (2006). "Chapter 4". Homosexual Behaviour in Animals – an Evolutionary perspective.
  113. ↑ Bruce Bagemihl (1999). Biological Exuberance – Animal Homosexuality and Natural Diversity.
  114. ↑ Connor, R.; Wells, R.; Mann, J.; Read, A. (2000). "The Bottlenose Dolphin". In Mann, J.; Connor, R.; Tyack, P.; Whitehead, H (eds.). Cetacean Societies. Chicago: Univ. of Chicago Press. p.  95. ISBN   978-0-226-50341-7.
  115. ↑ Mann, J.; Connor, R. C.; Barre, L. M.; Heithaus, M. R. (2000). "Female reproductive success in wild bottlenose dolphins (Tursiops sp.): Life history, habitat, provisioning, and group size effects". Behavioral Ecology. 11 (2): 210–219. doi: 10.1093/beheco/11.2.210 .
  116. ↑ Mann, J. (2006). "Establishing Trust: Sociosexual behaviour and the development of male-male bonds among Indian Ocean bottlenose dolphin calves". In Vasey, P.; Sommer, V (eds.). Homosexual Behaviour in Animals: An Evolutionary Perspective. Cambridge University Press. ISBN   978-0-521-86446-6.
  117. ↑ Noren, S. R. (2008). "Infant Carrying Behaviour in Dolphins: Costly Parental Care in an Aquatic Environment". Functional Ecology. 22 (2): 284–288. Bibcode:2008FuEco..22..284N. doi:10.1111/j.1365-2435.2007.01354.x. JSTOR   20142803 . Retrieved November 19, 2022.
  118. ↑ "Know your ally: Cooperative male dolphins can tell who's on their team". phys.org. Retrieved April 22, 2021.
  119. ↑ Connor, Richards (2000). Cetacean Societies: Field Studies of Dolphins and Whales . Chicago: University of Chicago Press. ISBN   978-0-226-50341-7.
  120. ↑ Díaz López, Bruno; Shirai J.A. (2007). "Marine aquaculture and bottlenose dolphins' (Tursiops truncatus) social structure". Behavioral Ecology and Sociobiology. 62 (6): 887–894. doi:10.1007/s00265-007-0512-1. S2CID   24197908.
  121. ↑ Wells, R.S., M.D. Scott and A.B. Irvine. (1987) "The social structure of free-ranging bottlenose dolphins", pp. 247–305 in: Genoways, H. (ed.), Current Mammalogy, Vol. 1. New York: Plenum Press.
  122. ↑ LUSSEAU, DAVID; WILSON, BEN; HAMMOND, PHILIP S.; GRELLIER, KATE; DURBAN, JOHN W.; PARSONS, KIM M.; BARTON, TIM R.; THOMPSON, PAUL M. (January 2006). "Quantifying the influence of sociality on population structure in bottlenose dolphins". Journal of Animal Ecology. 75 (1): 14–24. Bibcode:2006JAnEc..75...14L. doi:10.1111/j.1365-2656.2005.01013.x. ISSN   0021-8790. PMID   16903039.
  123. ↑ Acevedo-Gutiérrez, Alejandro; William F. Perrin; Bernd G. Würsig; J. G. M. Thewissen (2008). "Group behavior". Encyclopedia of Marine Mammals (2 ed.). United States: Academic Press. pp. 511–520. ISBN   978-0-12-373553-9.
  124. ↑ Díaz López, Bruno; Shirai J.B. (2008). "Marine aquaculture off Sardinia Island (Italy):ecosystem effects evaluated through a trophic mass-balance model". Ecological Modelling. 212 (3–4): 292–303. Bibcode:2008EcMod.212..292D. doi:10.1016/j.ecolmodel.2007.10.028.
  125. ↑ Díaz López, Bruno; Shirai J.B. (2006). "Bottlenose dolphin (Tursiops truncatus) presence and incidental capture in a marine fish farm on the northeastern coast of Sardinia (Italy)". Journal of the Marine Biological Association of the United Kingdom. 87 (1): 113–117. doi:10.1017/S0025315407054215. S2CID   86115152.
  126. ↑ "Comparative Mammalian Brain Collections – Bottlenose Dolphin (Tursiops truncatus)" . Retrieved September 30, 2008.
  127. ↑ Duffy-Echevarria, Erin E.; Connor, Richard C.; Aubin, David J. St. (January 1, 2008). "Observations of strand-feeding behavior by bottlenose dolphins (Tursiops truncatus) in Bull Creek, South Carolina". Marine Mammal Science. 24 (1): 202–206. Bibcode:2008MMamS..24..202D. doi:10.1111/j.1748-7692.2007.00151.x.(subscription required)
  128. ↑ Engleby, Laura K.; Powell, Jessica R. (2019). "Detailed observations and mechanisms of mud ring feeding by common bottlenose dolphins (Tursiops truncatus truncatus) in Florida Bay, Florida, U.S.A." Marine Mammal Science. 35 (3): 1162–1172. Bibcode:2019MMamS..35.1162E. doi:10.1111/mms.12583. ISSN   1748-7692. S2CID   91392196.
  129. ↑ Díaz López, Bruno (2006). "Interaction between bottlenose dolphins and fisheries off Sardinia". ICES Journal of Marine Science. 63 (5): 946–951. doi: 10.1016/j.icesjms.2005.06.012 .
  130. ↑ "Dolphin rescues stranded whales". CNN. March 12, 2008. Archived from the original on May 12, 2008.
  131. ↑ Brooks, David (March 12, 2008). "Dolphin rescues beached whales". Herald Sun. Australia. Archived from the original on April 29, 2008.
  132. ↑ Tennenhouse, Erica (July 30, 2019). "Dolphin mom adopts whale calf—a first". National Geographic. National Geographic Society. Archived from the original on July 31, 2019. Retrieved July 31, 2019.
  133. ↑ Read, Andrew (1999). Porpoises. Stillwater, MN, USA: Voyageur Press. ISBN   978-0-89658-420-4.
  134. ↑ "Evidence Puts Dolphins in New Light, as Killers". Luna.pos.to. July 6, 1999. Archived from the original on June 4, 2012. Retrieved June 12, 2012.
  135. ↑ Ryan, Conor (2008). "Attack on Harbour Porpoise (Phocoena phocoena (L. 1758) by Bottle-nosed Dolphins (Tursiops truncatus (Montagu 1821)". Irish Naturalists' Journal. 29 (2): 130.
  136. ↑ Dolphin attacks on porpoises baffle experts BBC News, July 15, 2014
  137. ↑ Reeves, R.; Stewart, B.; Clapham, P.; Powell, J. (2002). Guide to Marine Mammals of the World. New York: A.A. Knopf. p.  434. ISBN   978-0-375-41141-0.
  138. ↑ NOAA (2003). "Bottlenose Dolphin (Tursiops truncatus): California/Oregon/Washington Offshore Stock" (PDF). nmfs.noaa.gov. Retrieved September 21, 2008.
  139. ↑ Shirihai, H.; Jarrett, B. (2006). Whales Dolphins and Other Marine Mammals of the World. Princeton: Princeton Univ. Press. p. 166. ISBN   978-0-691-12757-6.
  140. 1 2 3 4 5 "Bottlenose Dolphins (Tursiops truncatus)". Animal Corner. Retrieved September 16, 2008.
  141. ↑ Heithaus, M.; Dill, L. (2002). "Food Availability and Tiger Shark Predation Risk Influence Bottlenose Dolphin Habitat Use". Ecology . 83 (2): 480–491. doi:10.1890/0012-9658(2002)083[0480:FAATSP]2.0.CO;2. S2CID   14944929.
  142. ↑ Gannon, D.; Barros, N.; Nowacek, D.; Read, A.; Waples, D.; Wells, R. (2004). "Prey detection by bottlenose dolphins, Tursiops truncatus: an experimental test of the passive listening hypothesis". Animal Behaviour. 69 (3): 709–720. doi:10.1016/j.anbehav.2004.06.020. S2CID   53201926.
  143. ↑ Eisfeld, S (October 2003). "The social affiliation and group composition of bottlenose dolphins (Tursiops truncatus) in the outer southern Moray Firth, NE Scotland" (PDF). MSc Thesis, School of Biological Sciences, University of Wales, Bangor. p. 42. Archived from the original (PDF) on October 2, 2008.
  144. ↑ The Dolphin Institute. "Bottlenose Dolphin: Natural History and Ecology". dolphin-institute.org. Archived from the original on April 5, 2002. Retrieved March 6, 2016.
  145. ↑ Thomson, Ainsley (November 25, 2004). "Dolphins saved us from shark, lifeguards say". The New Zealand Herald.
  146. ↑ Diaz Lopez, B.; Shirai, J.A.; Prieto, A.; Fernández, P. (2008). "Diving activity of a solitary wild free ranging bottlenose dolphin (Tursiops truncatus)" (PDF). Journal of the Marine Biological Association of the UK. 88 (6): 1153–1157. Bibcode:2008JMBUK..88.1153D. doi:10.1017/S0025315408000921. S2CID   85607255. Archived from the original (PDF) on January 31, 2009.
  147. ↑ Dr. Moti Nissani (2008). "Cooperative Dolphins of Laguna: Data on Nature of Signal (video and detailed description)". YouTube . Archived from the original on December 12, 2021.
  148. ↑ Simões-Lopes, Paulo C. (1998). "Dolphin interactions with the mullet artisanal fishing on southern Brazil: a qualitative and quantitative approach". Revista Brasileira de Zoologia. 15 (3): 709–726. doi: 10.1590/s0101-81751998000300016 . hdl: 10183/87930 .
  149. ↑ "Bottlenose Dolphin". Archived from the original on April 21, 2008. Retrieved August 11, 2008.
  150. ↑ Australian Government. "Dolphins and porspoises". Department of the Environment, Water, Heritage and the Arts. Archived from the original on June 29, 2007. Retrieved October 24, 2008.
  151. ↑ Waples and Gales 2002. Evaluating and minimising social stress in the care of captive bottlenose dolphins (Tursiops aduncus) http://onlinelibrary.wiley.com/doi/10.1002/zoo.10004/abstract
  152. ↑ Alave, Kristine L. (September 12, 2007). "Animal rights groups rap Pasig dolphin show". Archived from the original on January 17, 2008.
  153. ↑ "Katrina dolphin rescue launched". BBC. September 15, 2005. Retrieved February 14, 2008.
  154. ↑ "Dolphins Deployed as Undersea Agents in Iraq". National Geographic. Archived from the original on March 16, 2006. Retrieved January 18, 2009.
  155. ↑ Rehn, KW; Riggs, PK (2002). "Non-Lethal Swimmer Neutralization Study". U.S. Space and Naval Warfare Systems Center Technical Report. Document Number 3138. Archived from the original on May 30, 2011. Retrieved September 25, 2008.{{cite journal}}: CS1 maint: unfit URL (link)
  156. ↑ "U.S. Navy Marine Mammal Program Web Site". U.S. Navy. U.S. Navy Marine Mammal Program. Archived from the original on January 15, 2009.
  157. ↑ Reuters (1994), Female-friendly dolphin kills male swimmer in Brazil Archived June 17, 2016, at the Wayback Machine , article retrieved October 26, 2006.
  158. ↑ "American Cetacean Society – Bottlenose Dolphin". Archived from the original on July 25, 2008. Retrieved August 31, 2008.
  159. ↑ "Flipper (1995)". IMDb. October 1995. Retrieved November 3, 2006.
  160. ↑ Scully, Mike (2009). The Simpsons The Complete Twelfth Season DVD commentary for the episode "Treehouse of Horror IX" (DVD). 20th Century Fox.
  161. ↑ "Dolphin Tale". Rotten Tomatoes . Flixster . Retrieved January 9, 2016.
  162. ↑ "Dolphin Tale 2". Rotten Tomatoes . Flixster . Retrieved January 9, 2016.
  163. ↑ Sports Ecyclopedia. "Miami dolphins (1996-Present)". sportsecyclopedia.com. Retrieved March 6, 2016.
  164. ↑ Constantine, R. (2002). "Folklore and Legends". In Perrin, W.; Würsig, B.; Thewissen, J (eds.). Encyclopedia of Marine Mammals. Academic Press. p.  448. ISBN   978-0-12-551340-1.
  165. ↑ "More than 80% of Indian Ocean dolphins may have been killed by commercial fishing, study finds". TheGuardian.com . March 2, 2020.
  166. ↑ Betts KS (May 2007). "Perfluoroalkyl Acids: What Is the Evidence Telling Us?". Environmental Health Perspectives. 115 (5): A250–A256. doi:10.1289/ehp.115-a250. PMC   1867999 . PMID   17520044. Archived from the original on June 27, 2007.
  167. ↑ Betts KS (2008). "Not immune to PFOS effects?". Environ. Health Perspect. 116 (7): A290. doi:10.1289/ehp.116-a290a. PMC   2453185 . PMID   18629339.
  168. ↑ Houde M; Martin JW; Letcher RJ; Solomon KR; Muir DC (2006). "Biological monitoring of polyfluoroalkyl substances: A review". Environmental Science & Technology. 40 (11): 3463–73. Bibcode:2006EnST...40.3463H. doi:10.1021/es052580b. PMID   16786681.
  169. ↑ Lavery TJ, Butterfield N, Kemper CM, Reid RJ, Sanderson K (2008). "Metals and selenium in the liver and bone of three dolphin species from South Australia, 1988–2004". The Science of the Total Environment. 390 (1): 77–85. Bibcode:2008ScTEn.390...77L. doi:10.1016/j.scitotenv.2007.09.016. PMID   18006044.
  170. ↑ Lavery TJ, Kemper CM, Sanderson K, et al. (2009). "Heavy metal toxicity of kidney and bone tissues in South Australian adult bottlenose dolphins (Tursiops aduncus)" (PDF). Marine Environmental Research. 67 (1): 1–7. Bibcode:2009MarER..67....1L. doi:10.1016/j.marenvres.2008.09.005. PMID   19012959.
  171. ↑ Curran S, Wilson B, Thompson P (1996). "Recommendations for the sustainable management of the bottlenose dolphin population in the Moray Firth". Scottish Natural Heritage Review. 56. Archived from the original on December 22, 2015. Retrieved August 27, 2013.
  172. ↑ Currey RJ, Dawson SM, Slooten E, Schneider K, Lusseau D, Boisseau OJ, Haase P, Williams JA (November 25, 2008). "Survival rates for a declining population of bottlenose dolphins in Doubtful Sound, New Zealand: an information theoretic approach to assessing the role of human impacts". Aquatic Conservation: Marine and Freshwater Ecosystems. 19 (6): 658–670. Bibcode:2009ACMFE..19..658C. doi:10.1002/aqc.1015.
  173. ↑ Currey, Rohan; M. Dawson, Stephen; Slooten, Elisabeth; Schneider, Karsten; Lusseau, David; J. Boisseau, Oliver (2009). "Survival rates for a declining population of bottlenose dolphins in Doubtful Sound, New Zealand: An information theoretic approach to assessing the role of human impacts". Aquatic Conservation: Marine and Freshwater Ecosystems. 19 (6): 658–670. Bibcode:2009ACMFE..19..658C. doi:10.1002/aqc.1015.
  174. ↑ Manlik O.; McDonald J.A.; Mann J.; Raudino H.C.; Bejder L.; Krützen M.; Connor R.C.; Heithaus M.R.; Lacy R.C.; Sherwin W.B. (2016). "The relative importance of reproduction and survival for the conservation of two dolphin populations". Ecology and Evolution. 6 (11): 3496–3512. Bibcode:2016EcoEv...6.3496M. doi:10.1002/ece3.2130. PMC   5513288 . PMID   28725349.
  175. ↑ Marine Mammal Center. "The Marine Mammal Protection Act of 1972, Amended 1994". marinemammalcenter.org. Retrieved March 6, 2016.

Further reading

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.