It has a worldwide distribution with a global population of about 700,000, and there may be 3 or 4 distinct populations—two in the Pacific and one in the Atlantic and Indian Oceans. Its range is moving northward due to global warming. In the Pacific, males average 4–6m (13–20ft) and females 3–5m (9.8–16.4ft). It generally has a stocky build with black to dark gray or brown skin, and can be distinguished from its counterpart by shorter flippers, fewer teeth, and a shorter beak. It is thought to pursue fast-moving squid typically at a depth of 700m (2,300ft), but the maximum recorded depth is 1,018m (3,340ft).
The short-finned pilot whale has been reported as being highly playful and social. It typically travels in pods of 10–30 members, usually family, but has been observed moving in groups of several hundred. Like killer whales, it has a matrilineal social hierarchy with an elder female at the head and a sizable post-reproductive lifespan. It is polygynous; females often outnumber males 8:1 in a pod.
Pods are known to mass strand, possibly due to sheer accident, biosonars confused by geomagnetic anomalies, injury from loud military sonar, or disease. It was historically whaled, and is still whaled today by Japan and the Lesser Antilles, but it is protected by several international treaties.
Taxonomy
The name "pilot whale" originated with an early theory that pods were "piloted" by a leader. Other common names include the "pothead whale" (after the bulbous melon), and "blackfish" (a catch-all term used to designate numerous species of small, dark-colored toothed whales, including the pygmy sperm whale and false killer whale).[4]
Worldwide, the diversity of mitochondrial DNA in short-finned pilot whales is considered to be low relative to other species with global distributions.[5] A 2014 study found a unique haplotype in the Caribbean region.[6]
Evolution
The short-finned pilot whale is considered to be a single species with three divergent types: the Shiho, Naisa and Atlantic short-finned pilot whales.[7]
The Shiho and Naisa forms are actually subspecies of the short-finned pilot whale, with the Shiho clade having diverged approximately 17.5 thousand years ago (kya), during the last glacial maximum. The exact boundaries of the two subspecies' ranges remain undefined due to lack of data. Based on current evidence, the Shiho subspecies is distributed in the eastern Pacific Ocean, and the Naisa subspecies encompasses the central/western Pacific and Indian Oceans, as well as the Atlantic Ocean. It appears as though the Pacific Ocean acts as a semi‐permeable barrier between the two subspecies, allowing occasional migration and mixing between the eastern and western Pacific Ocean, but keeping the populations separate enough to drive this differentiation.[7]
The Atlantic clade is thought to have diverged from the Naisa approximately 12.5 kya, however this split is supported by mitochondrial DNA only, and not nuclear DNA. Further analysis is required to clarify whether the Atlantic Ocean and central/western Pacific and Indian Oceans pilot whales may also be sufficiently distinct to be considered subspecies.[7]
The Atlantic and Indian/western-central Pacific types are also diverging from each other, with the Benguela Current off the coast of South Africa separating the two.[7]
Description
Illustration
Short-finned pilot whales are black to dark gray/brown, with a thick tail stock, fluke with sharply pointed tips, bulbous head, and a broad, sickle-shaped dorsal fin.[8] Coloration typically includes light grey to white areas such as a saddle patch behind the dorsal fin, a light grey or white anchor-shaped patch under the chin and belly, and a blaze marking behind the eye.[4] These traits, however, can vary between populations. For example, two distinct forms are described from on the Pacific coast of central Japan: the Shiho morphotype is the larger of the two– females 4 to 5m (13 to 16ft), males 5 to 6m (16 to 20ft), and has a white dorsal patch and round melon, while the Naisa type is smaller– females 3 to 4m (10 to 13ft), males 4 to 5m (13 to 16ft)– with a characteristic flattened or squarish melon and a darker, indistinct saddle patch.[9] Short-finned pilot whales can reach up to 7.2m (24ft) in length and weigh up to 4,000kg (8,800lb), making it the third-largest species of oceanic dolphin, behind the orca and long-finned pilot whale. When they are born, short-finned pilot whales weigh about 60kg (130lb) at a length of 1.4 to 1.9m (4ft 7in to 6ft 3in).[10][11]
Long-finned and short-finned pilot whales are often hard to tell apart. However, as their names indicate, short-finned pilot whale flippers are shorter than those of the long-finned pilot whale, measuring about 1/6th of the body length.[4] Short-finned pilot whales also have fewer teeth – 7–9 in each row – and a shorter and broader rostrum with a premaxilla that covers more of the maxilla.[12] Both species exhibit sexual dimorphism and have similar lifespans of about 45 years for males and 60 years for females, with long-finned pilot whales being generally larger than short-finned pilot whales.[13] The two species have limited overlap worldwide; long-finned pilot whales are found in cooler temperate waters, while the distribution of short-finned pilot whales is largely tropical and subtropical.[14]
Short-finned pilot whales are found in both coastal and pelagic waters in temperate and tropical regions of the Indian, Atlantic, and Pacific Oceans. Information on the spatial habitat use of pilot whales in the northwest Atlantic is limited, however short-finned pilot whales are thought to range from the southern end of Georges Bank into the tropics, overlapping with the range of the long-finned pilot whales along the mid-Atlantic shelf break between Delaware and Georges Bank.[15][16]
Off the coast of Japan, the distributions of the Shiho and Naisa types are well-documented and largely nonoverlapping, with the Naisa-type inhabiting the warm-temperate waters of the Kuroshio Current, and the Shiho-type inhabiting cold-temperate waters of the Oyashio Current.[9] Some evidence suggests these populations might even be distinct subspecies, based on differences in morphology, mitochondrial DNA and breeding seasons. Beyond Japan, the Naisa-type occurs in southeast Asia, the Indian Ocean, and Hawaii, and the Shiho-type can be found in the California Current and off Peru.[16]
Pilot whales show strong natal philopatry, often remaining year-round in places such as Hawaii, the U.S. and British Virgin Islands, the Madeira Islands, and parts of California, though some populations migrate with the seasonal and annual fluctuations in temperature and productivity.[17]
Once commonly seen off of Southern California, short-finned pilot whales disappeared from the area after a strong El Niño year in 1982 and 1983, and have since been encountered infrequently, primarily during warm-water years such as 1991, 1993, 1997, 2014, and 2015.[18][13] It is not known whether the animals sighted more recently were part of the same population that was documented off Southern California before the mid-1980s, or a different wide-ranging pelagic population, therefore the status of this stock remains unknown.
Pilot whales are economically important in the whale-watching industry of some areas of the world, such as Madeira, Hawaii, and the Canary Islands, which host resident populations of these whales. The effects of tourism activities on pilot whales have not been well studied, but some evidence suggests that the impact of underwater noise from whale-watching boats can have the potential to significantly disrupt communication at close range.[19] Many countries offer safe whale-watching guidelines designed to minimize the impact of their activities on the animals being watched (see supplementary materials).
Short-finned pilot whales are long-lived, slow to reproduce, and highly social animals. They are usually found in pods of 10 to 30 individuals, though groups of up to several hundred short-finned pilot whales have been reported in the Caribbean.[20] These pods are stable social structures, meaning that they form hierarchical associations that remain stable for generations,[21] and are primarily thought to be matrilineal, i.e. led by an elder female relative, similar to those of resident killer whales.[4] However, a study by Van Cise et al. (2017) showed that, in the Hawaii islands, the social organization of pods was indicative of familial behaviour rather than matrilineal, and was driven by genetic relatedness.[22] Groups of closely related individuals formed tight associations, or clusters, with other close relatives, and genetic analysis revealed a significant differentiation between clusters, even those that were present in the same area. Clusters that were more genetically different also spent less time together. This could suggest that social behaviour in short-finned pilot whales inhibits gene flow outside of family groups.
Pilot whales are also known for their socializing and playful behaviour at the surface, such as lobtailing (slapping their flukes on the water surface) and spy-hopping (poking their heads above the surface). Members of a pod have also been observed making various altruistic behaviours, such as alloparental care, in which nonparent whales help to take care of young that are not their own.[23] In the closely related long-finned pilot whales, babysitting of calves by other group members is frequently documented, and can be performed by males as well as females.[24]
Reproduction
A short-finned pilot whale comes up to the surface of the water.
Males are polygynous, meaning they will mate with multiple females at one time and throughout their lives.[25] Pods are often found with around one mature male per every eight mature females. During mating aggregations, males will temporarily leave their pods to mate with females from other pods, but will return to their own pods once mating is over, which helps to prevent inbreeding.[23] Female pilot whales mature at about 7–12 years of age, and will start having calves every five to eight years, averaging about 4 to 5 calves in a lifetime. A calf will suckle its mother for a minimum of two years, with most continuing to suckle for five years, and some evidence suggests that females may continue to lactate for up to 15 years after the birth of their last calf. A female will usually stop reproducing once reaching the age of 40 years, even though the maximum lifespan exceeds 60 years.[23]
Foraging
Short-finned pilot whales are apex predators.[26][27] The diet preferences and foraging habits of short-finned pilot whales are still poorly understood, however, they are known to be deep-divers, and are generally found foraging on the steep slopes along the continental shelf break.[16] The diet of these large marine predators is thought to consist primarily of squid, but will also include certain species of fish and octopus.[28] On rare occasions, they are also known to prey on other marine mammals.[29][30]
They use echolocation when they hunt, clicking and listening for echoes from prey as they descend and generating a rapid "buzz" of clicks at the depth of their dive that accompanies a high-speed sprinting attack.[31][32]
They have been recorded to feed at a maximum depth of 1018m (3340ft) for a length of 21 minutes, although average dives tend to be shallower (around 700m) and last around 15 minutes. When foraging, a pod may spread out up to 800 m (half-mile) to find food. Pilot whales are known as the 'cheetahs of the deep' for the high-speed pursuits of squid at depths of hundreds of meters.[32]
The total of all available abundance estimates for short-finned pilot whales is approximately 700,000 individuals, but populations vary worldwide, and large parts of the species' range have not been surveyed, therefore actual abundance could be considerably greater than this.[15]
In the western Pacific, population estimates range from 5,300 individuals in Northern Japan to 53,608 in Southern Japan.[33] 7,700 individuals are reported in the eastern Sulu Sea (Philippines),[34] and in the Eastern tropical Pacific the most recent estimate from 2000 gives 589,000 individuals.[35] The resident population in Tenerife, Spain, is estimated at only 350 individuals.[36]
Three stocks of short-finned pilot whales are recognized in U.S. waters, which live along the east and west coasts, and around the Hawaiian Islands.[13] The best available abundance estimates place the West Coast stock at only 800 animals, and the East Coast stock at 21,500. These estimates come from sightings reported from vessel and aerial surveys, and may be under-representing the true population abundance due to the wide range that the species covers, and the difficulty of distinguishing long-finned and short-finned pilot whales at sea.[13]
The Hawaiian archipelago is home to the Naisa-type short-finned pilot whale, which appears to be segregated into three island-associated communities based on photo-ID and satellite tagging data: the Main Hawaiian Islands (MHI) community, the Northwestern Hawaiian Islands (NWHI) community, found around O’ahu and Kaua’i Islands, and the central MHI community around O’ahu and Lāna’i Islands.[37] There are no population estimates for the different island communities, but in all of Hawaiian waters there are an estimated 90-20 thousand short-finned pilot whales, with the MHI community being the most abundant.
Short-finned pilot whales are among the most frequently encountered cetaceans in the Canary Islands, but estimates of abundance are not available.[38] Records suggest they are also abundant in deep water off the west coast of Africa, around the Maldives, and in the northern Indian Ocean more generally.[15] However, despite previous study efforts, there is still no information on global numbers or trends for this species.[4]
Threats
Natural predators and strandings
A number of beached short-finned pilot whales on Highland beach.
There are no documented cases of natural predation on pilot whales, although the species could occasionally be targeted by killer whales or large sharks.[4] Most of the data on pilot whale mortalities comes from mass stranding events. Pilot whales are often involved in mass strandings throughout their range, with several well-documented incidents involving dozens of individuals in Australia, the Canary Islands, and the U.S.[39][40][41] Many theories have been proposed to explain these events, which include accidents in navigation that lead animals to unexpectedly shallow waters,[42] anomalies in the earth's geomagnetic fields impacting navigation,[43] injury or disorientation caused by military sonar,[44] or impaired navigation in diseased individuals that lead the rest of the group astray. Due to their tight social bonds, rescue attempts following strandings are not always successful, as whales will often re-strand themselves upon hearing the calls of their group members on shore.
Human-induced threats
A Japanese meal with short-finned pilot whale meat includes a skewer of fried whale meat (left) and a bowl with grilled meat over rice, topped with pickled ginger (right).
Short-finned pilot whales have been hunted for many centuries, particularly by Japanese whalers.[25] Between 1948 and 1980, hundreds of whales were exploited at Hokkaido and Sanriku in the north and Taiji, Izu, and Okinawa in the south. Annual catches have ranged from 100 to 500 whales from 1972 to 2009 across the country, and the practice continues to this day. Today, pilot whales are hunted in a few areas of Japan, mainly along the central Pacific coast, as well as the Lesser Antilles (e.g., St. Vincent and the Grenadines, St. Lucia, Dominica, Martinique), where whales are commercially hunted and the meat is available for human consumption.[45] Pilot whales' strong social bonds and herding instincts make them prime candidates for so-called drive fisheries, where whales are herded towards shore by boats and then killed in shallow waters.[46] Other hunting methods include hand or crossbow-projected harpooning, and small-type whaling (defined as the use of a cannon mounted on a vessel below a certain size). From 1993 to 2004, the annual quota for all short-finned pilot whale takes in Japan was 500, a large proportion of which was allocated to the drive hunt in Taiji.[47] Whaling documentation in the Caribbean has been sporadic and often incomplete, but at least in St. Vincent and the Grenadines, local hunters have taken an average of 141 pilot whales and 159 dolphins of various species annually from 1962 to 2009.[48]
Certain Japanese restaurants serve pilot whale as sashimi, or as steaks that are marinated, cut into small chunks, and grilled. The meat is high in protein and low in fat (a whale's fat is contained in the layer of blubber beneath the skin).[49] It is considered integral to certain cultures.[46] When grilled, the meat is slightly flaky and described as being quite flavorful, somewhat gamey, with distinct yet subtle undertones recalling its marine origin.
Like many marine predators, pilot whales are susceptible to entanglement and bycatch in pelagic fishing gear, such as gill nets, long lines and some trawl fisheries.[4] Once entangled or hooked, whales may drag the gear behind them for long distances, resulting in fatigue, compromised feeding ability, or injury, often leading to reduced reproductive success and death. Pilot whales are also susceptible to vessel strikes, which can be lethal, or lead to injury and behavioural changes.[50] As top predators, pilot whales also suffer from the bioaccumulation of contaminants such as heavy metals and organichlorines in their tissues, which can have serious long-term impacts on health and reproduction, and is a rising concern in cultures that consume pilot whale meat.[47] Short-finned pilot whales off the west coast of the US were found to have high amounts of DDT and PCB, however the levels were lower in whales from Japan and the Antilles.
Short-finned pilot whales, have been kept in captivity in various marine parks off southern California, Hawaii and Japan, arguably starting the late 1940s.[51] Pilot whales have historically had low survival rates in captivity, with less than half surviving past 24 months.[52] Bubbles, a female short-finned pilot whale who was displayed in Marineland, and eventually at Sea World California, was one exception to the rule, living to be somewhere in her 50s when she eventually died on 12 June 2016.[53]
Climate change
In the context of global warming, the ranges of short-finned pilot whales are expected to shift northward in response to warming temperatures, which could eventually lead to increased overlap and potential hybridization with their long-finned cousins.[54] The distribution limit of short-finned pilot whales in the Northeast Atlantic has already shifted 3° latitude in only two decades, and evidence for introgressive hybridization (i.e. the movement of a genes from one species into the gene pool of another) with long-finned pilot whales is appearing in DNA samples from the Northeast Atlantic. Like many other species, pilot whales are also likely to be affected by changes in prey distribution and abundance, habitat degradation, and other secondary effects of climate change, coupled with human-mediated stressors such as marine traffic and pollution, which could lead to the global decline, or even loss, of this species.
Conservation
The short-finned pilot whale was listed on the IUCN Red List as Data Deficient in 2008, and remains data-poor in much of its range, especially in the Southern Hemisphere and in large parts of the tropical and warm temperate North Atlantic Ocean.[15]
The short-finned pilot whale is covered by the Agreement on the Conservation of Small Cetaceans of the Baltic, North East Atlantic, Irish and North Seas (ASCOBANS),[55] and the Agreement on the Conservation of Cetaceans in the Black Sea, Mediterranean Sea and Contiguous Atlantic Area (ACCOBAMS).[56] The purpose of these two groups is to reduce threats to cetaceans through improving current knowledge, and enforcement of the outlined conservation measures.
The species is further included in the Memorandum of Understanding Concerning the Conservation of the Manatee and Small Cetaceans of Western Africa and Macaronesia (Western African Aquatic Mammals MoU)[57] and the Memorandum of Understanding for the Conservation of Cetaceans and Their Habitats in the Pacific Islands Region (Pacific Cetaceans MoU).[58] In the United States, short-finned pilot whales are protected under the Marine Mammal Protection Act. Globally, they are listed in Appendix II of the Convention on International Trade in Endangered Species (CITES), which aim is to ensure that international trade in specimens of wild animals and plants does not threaten their survival.
Around the world, several efforts aim to address the threats faced by cetaceans, including pilot whales. For example, in the United States, NOAA Fisheries implemented the Pacific Offshore Cetacean Take Reduction Plan, which aims to reduce serious injuries and deaths of marine mammals incidental to the California/Oregon thresher shark/swordfish drift gillnet fishery through methods like gear modifications, limited fishing depth, and skipper education workshops.[59]
In areas where resident pilot whale populations are seen near the coast, such as those off the Canary Islands, Madeira, and Hawaii, they can be studied using photo-identification. This technique helps researchers identify unique markings and scars on the whales' dorsal fins, which are used to recognize individuals from photographic surveys to monitor movements and life histories over time.[60][50] Other research techniques including satellite tagging, acoustics, and genetics to learn about the species' long-range movements, genetic diversity and social behaviour. However, there have been few long-term studies focused on this species, and data is spotty for many of the small local populations. This makes assessing threats and population dynamics difficult, and more research is needed before any statements can be made on the global status of short-finned pilot whales.
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.
The fin whale, also known as the finback whale or common rorqual, is a species of baleen whale and the second-longest cetacean after the blue whale. The biggest individual reportedly measured 26 m (85 ft) in length, with a maximum recorded weight of 77,000–81,000 kg (170,000–179,000 lb). The fin whale's body is long, slender and brownish-gray in color, with a paler underside to appear less conspicuous from below (countershading).
Risso's dolphin is a dolphin, the only species of the genus Grampus. Some of the closest related species to these dolphins include: pilot whales, pygmy killer whales, melon-headed whales, and false killer whales.
Blainville's beaked whale, or the dense-beaked whale, is believed to be the widest ranging mesoplodont whale. The French zoologist Henri de Blainville first described the species in 1817 from a small piece of jaw — the heaviest bone he had ever come across — which resulted in the name densirostris. Off the northeastern Bahamas, the animals are particularly well documented, and a photo identification project started sometime after 2002.
The tropical bottlenose whale, also known as the Indo-Pacific beaked whale or Longman's beaked whale, was considered to be the world's rarest cetacean until recently, but the spade-toothed whale now holds that position. As of 2010, the species is now known from nearly a dozen strandings and over 65 sightings. This is the only species in the genus Indopacetus.
The long-finned pilot whale, or pothead whale (Globicephalamelas) is a large species of oceanic dolphin. It shares the genus Globicephala with the short-finned pilot whale. Long-finned pilot whales are known as such because of their unusually long pectoral fins.
Pilot whales are cetaceans belonging to the genus Globicephala. The two extant species are the long-finned pilot whale and the short-finned pilot whale. The two are not readily distinguishable at sea, and analysis of the skulls is the best way to distinguish between the species. Between the two species, they range nearly worldwide, with long-finned pilot whales living in colder waters and short-finned pilot whales living in tropical and subtropical waters. Pilot whales are among the largest of the oceanic dolphins, exceeded in size only by the orca. They and other large members of the dolphin family are also known as blackfish.
The sei whale is a baleen whale. It is one of ten rorqual species, and the third-largest member after the blue and fin whales. They can grow up to 19.5 m (64 ft) in length and weigh as much as 28 t. Two subspecies are recognized: B. b. borealis and B. b. schlegelii. The whale's ventral surface has sporadic markings ranging from light grey to white, and its body is usually dark steel grey in colour. It is among the fastest of all cetaceans, and can reach speeds of up to 50 km/h (31 mph) over short distances.
The four-toothed whales or giant beaked whales are beaked whales in the genus Berardius. They include Arnoux's beaked whale in cold Southern Hemispheric waters, and Baird's beaked whale in the cold temperate waters of the North Pacific. A third species, Sato's beaked whale, was distinguished from B. bairdii in the 2010s.
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.
The pygmy killer whale is a poorly known and rarely seen oceanic dolphin. It is the only species in the genus Feresa. It derives its common name from sharing some physical characteristics with the orca, also known as the killer whale. It is the smallest cetacean species that has the word "whale" in its common name. Although the species has been known to be extremely aggressive in captivity, this aggressive behavior has not been observed in the wild.
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.
The northern right whale dolphin is a small, slender species of cetacean found in the cold and temperate waters of the North Pacific Ocean. Lacking a dorsal fin, and appearing superficially porpoise-like, it is one of the two species of right whale dolphin.
The Atlantic white-sided dolphin is a distinctively coloured dolphin found in the cool to temperate waters of the North Atlantic Ocean.
Cetacean stranding, commonly known as beaching, is a phenomenon in which whales and dolphins strand themselves on land, usually on a beach. Beached whales often die due to dehydration, collapsing under their own weight, or drowning when high tide covers the blowhole. Cetacean stranding has occurred since before recorded history.
Cetaceans form an infra-order of marine mammals. In 2020, approximately 86 species of cetaceans had been identified worldwide. Among these species, at least 35 have been sighted in the wider Caribbean region with very widespread distribution and density variations between areas. Caribbean waters are a preferred breeding site for several species of mysticeti, who live further north the rest of the year. The tucuxi and the boto live at the southern periphery of the Caribbean region in the freshwaters of the Amazon River and surrounding drainage basins.
Natacha Aguilar de Soto is a Spanish marine biologist at the University of La Laguna (ULL), Tenerife, Canary Islands. She is a Ramón y Cajal research and teaching fellow at ULL and has been a Marie Skłodowska-Curie Research Fellow at ULL and at the Center for Research in Ecological Modeling (CREEM) of the University of St. Andrews (SMRU). She is the director of cetacean research within ULL's BIOECOMAC.
1 2 3 4 5 6 7 Olson, P.M. (2008). Perrin, P.W.; Wursig, B.; Thewissen, J.G.M (eds.). Pilot whale Globicephala melas and G. muerorhynchus, in Encyclopedia of Marine Mammals. San Diego (CA): Academic Press. pp.847–852.
↑ Tellez, R.; Mignucci-Giannoni, A.A.; Caballero, S. (2014). "Initial description of short-finned pilot whale (Globicephala macrorhynchus) genetic diversity from the Caribbean". Biochemical Systematics and Ecology. 56: 196–201. Bibcode:2014BioSE..56..196T. doi:10.1016/j.bse.2014.06.001.
1 2 3 4 Cise, Amy M. Van; Baird, Robin W.; Baker, Charles Scott; Cerchio, S.; Claridge, D.; Fielding, R.; Hancock-Hanser, B.; Marrero, J.; Martien, K. K. (2019). "Oceanographic barriers, divergence, and admixture: Phylogeography and taxonomy of two putative subspecies of short-finned pilot whale". Molecular Ecology. 28 (11): 2886–2902. Bibcode:2019MolEc..28.2886V. doi:10.1111/mec.15107. hdl:10023/20029. ISSN1365-294X. PMID31002212. S2CID122577199.
↑ Leatherwood, S.; Caldwell, DK; Winn, D.K. (1976). Whales, dolphins, and porpoises of the western North Atlantic. A guide to their identification (Report). U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service. p.176 pp.
1 2 Kasuya, T.; Miyashita, T.; Katsamatsu, F. (1988). "Segregation of two forms of short-finned pilot whales off the Pacific coast of Japan". Scientific Reports of the Whales Research Institute. 39: 77–90.
↑ van Bree, P.J.H. (1971). "On Globicephala sieboldii Gray, 1846, and other species of Pilot Whales (Notes on Cetacea, Delphinoidea III)". Beaufortia. 19 (249): 79–87.
↑ Tellez, R.; Mignucci-Giannoni, A.A.; Caballero, S. (2014). "Initial description of short-finned pilot whale (Globicephala macrorhynchus) genetic diversity from the Caribbean". Biochemical Systematics and Ecology. 56: 196–201. Bibcode:2014BioSE..56..196T. doi:10.1016/j.bse.2014.06.001.
↑ Alves, F.; Quérouil, S.; Dinis, A.; Nicolau, C.; Ribeiro, C.; Freitas, L.; Kaufmann, M.; Fortuna, C. (2013). "Population structure of short-finned pilot whales in the oceanic archipelago of Madeira based on photo-identification and genetic analyses: implications for conservation". Aquatic Conservation. 23 (5): 758–776. Bibcode:2013ACMFE..23..758A. doi:10.1002/aqc.2332. hdl:10400.13/3706.
1 2 3 Pryor, K.; Norris, K.S.; Marsh, H.; Kasuya, T. (1991). Pryor, K.; Norris, K.S. (eds.). Changes in the role of a female pilot whale with age, in Dolphin societies. Berkeley (CA): University of California Press. pp.281–286.
↑ Augusto, J.F.; Frasier, T.R.; Whitehead, H. (2016). "Characterizing alloparental care in the pilot whale (Globicephala melas) population that summers off Cape Breton, Nova Scotia, Canada". Marine Mammal Science. 32 (2): 440–456. Bibcode:2017MMamS..33..440A. doi:10.1111/mms.12377.
1 2 Kasuya, T.; Marsh, H. (1984). "Life history and reproductive biology of the short-finned pilot whale, Globicephala macrorhynchus, off the Pacific Coast Japan". Rep. Int. Whal. Comm. 6: 259–310.
↑ Report of the Sub-Committee on Small Cetaceans (Report). International Whaling Commission. 1992. pp.178–234.
↑ Dolar, M.L.; Perrin, W.F.; Taylor, B.L.; Kooyman, G.L.; Alava, M.N.R. (2006). "Abundance and distributional ecology of cetaceans in the central Philippines". Journal of Cetacean Research and Management. 8 (1): 93–112.
↑ Gerrodette, T.; Forcada, J. (2002). Estimates of abundance of western/southern spotted, whitebelly spinner and common dolphins, and pilot, sperm and Bryde's whales in the eastern tropical Pacific. NOAA, National Marine Fisheries Service, Southwest Fisheries Center Administrative Report LJ-02-20 (Report).
↑ Glen R. (2003). Beavioural responses of the short-finned pilot whale, Globicephala macrorhynchus, in relation to the number of surrounding whale-watching vessels (Report). Annual Meeting of the European Cetacean Society, Tenerife, Spain.
↑ Baird, R.W. (2016). The lives of Hawai'i's dolphins and whales: Natural history and conservation. Honolulu (HI): University of Hawai’i Press. p.341 pp.
↑ Mintzer, V.J.; Gannon, D.P.; Barros, N.B.; Read, A.J. (2008). "Stomach contents of mass-stranded short-finned pilot whales (Globicephala macrorhynchus) from North Carolina". Marine Mammal Science. 24 (2): 290–302. Bibcode:2008MMamS..24..290M. doi:10.1111/j.1748-7692.2008.00189.x.
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