Atlantic titi [1] | |
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Atlantic titi in Domingos Martins, Brazil | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Primates |
Suborder: | Haplorhini |
Infraorder: | Simiiformes |
Family: | Pitheciidae |
Genus: | Callicebus |
Species: | C. personatus |
Binomial name | |
Callicebus personatus (É. Geoffroy in Humboldt, 1812) | |
Atlantic titi range |
The Atlantic titi monkey or masked titi (Callicebus personatus) is a species of titi, a type of New World monkey, endemic to Brazil.
The Atlantic titi is part of the genus Callicebus which is composed of thirteen species and sixteen subspecies. Some more recent classifications of titis recognise many more species, and split the genus into three separate genera. The C. personatus group is retained in Callicebus. [3]
Three subspecies of Callicebus personatus have been described in scientific literature: C.p. melanochir, C.p. nigrifrons, and C.p. personatus, [4] each of which has been treated as a full species by some authors. Atlantic titis are territorial, middle-sized, cebid monkeys; usually 1–2 kg in size. [5] C. personatus are found primarily in the humid forests east of the Andes Mountains, specifically in the coastal, inland forests of south-eastern Brazil. The states they have been documented to dwell within include Bahia, Espírito Santo, Minas Gerais, Rio de Janeiro, and São Paulo. [6] Of all the Callicebus species, Atlantic titi monkeys have the largest geographic range except for C. torquatus , covering approximately 1,000 kilometers. They customarily share their living area with other monkeys such as the lion tamarin and spider monkey. [4]
The three subspecies of Callicebus personatus are products of clinical differentiation (when certain portions of the population are cut off from the parental stock due to an ecological barrier such as a river and are thus completely genetically isolated from one another). [4] Distinctions between each of the Callicebus subspecies are based on coat color. The evolution of these coat colors is termed metachromism. The pigments are produced by melanocytes which deposit the pigments into the medulla of growing hair so that the hair grows with the color of that distinct pigment. The characteristic pigment of the Callicebus is eumelanin (dark brown or black) found in the iris, skin, and hair (usually on the forehead, crown and tail). [4]
Atlantic titis are opportunistic feeders. In other words, they eat based on the abundance of food that is available to them in each season. Their food choices are not usually very selective, but they are frugivorous, usually eating fleshy fruits, seeds, and leaves. [5]
It has been documented that they can be geophagic meaning that at times they eat soil. Various hypotheses exist for their geophagic nature. These include the following: [7]
Masked titis are tree monkeys. It is not customary to find them on the forest floor. It is speculated that they prefer to remain in the rainforest trees to avoid snake predation. They remain at least 5 meters above the ground for 99% of their daily activities. Due to their frugivorous nature, they have rarely been observed on the ground foraging for insects or small vertebrates. Instead they prefer to remain high in the tree limbs of the dense eastern Brazilian rainforest. [7] Because they prefer not to be on the ground, researchers have observed them eating soil found atop ant mounds. This is an added advantage to the masked titis for the following reasons: [7]
For many years, researchers believed that geophagy might be used by the masked titi's as a sodium supplement as their high foliage diets were quite low in sodium. [7] However, results of geochemical analysis of the soils eaten by C. personatus demonstrated that these soils did not contain high quantities of sodium. Although the soil consumed by masked titis was found to contain many different minerals in comparison to random soil samples, these minerals where not necessarily a valuable component of the titi diet. Therefore, it was concluded that soil was not a nutritionally significant portion of their diet. [7] Another hypothesis suggested that the soil served as an antacid. However, results of the most recent studies demonstrated that the soil consumed by the monkeys contained a very low pH compared to random soil samples. Therefore, it seems geophagy is not principally used to buffer the stomach pH levels. In addition, because the clay molecule has a large flat structure that is ideal for toxin absorption, researchers also suggested that soil could serve to absorb the toxins acquired by the consumption of such a high quantity and variety of forest foliage. Unfortunately, more research needs to be conducted on this hypothesis to test its validity as currently no studies have been conducted on the toxicity levels in the fruit eaten by the masked titis. It is also important to note that termite mound soil was preferred by the titis in addition to the ant soil. Both the ant mound soil as well as the termite mound soil perform the same function for the monkeys, however some researchers have observed that the monkeys usually tend to prefer termite mound soil to ant mound soil when given both options. The reason for such a preference is not yet known. [7]
Regardless of the presence of humans in Brazilian forests, titi monkeys customarily venture to dwell in "disturbed" forests (forests that have been cut down or invaded by humans) as long as the food availability is higher than in undisturbed forests. [8] The use of disturbed and undisturbed forest by masked titi monkeys Callicebus personatus melanochir is proportional to food availability. [8] The Atlantic Forest of eastern Brazil has been cut down to 5% of its original state with only 2% of that being undisturbed forest. Their existence is completely dependent on their ability to successfully reside in disturbed forests. However, titis do not seem to be aware of the difference between a disturbed and undisturbed forest. As previously mentioned, they feed opportunistically and therefore will reside in whatever forest has the most food available. As long as food is available to them (even if humans provide this food), it is feasible that the monkeys survive the deforestation of much of the Southern American rain forests. [5]
Atlantic titis are usually monogamous (they stay with one mate throughout their entire lifespan). [5] They have one offspring per year. It is difficult to distinguish between the sexes externally, however Atlantic titi family dynamics indicate that the father carries the infant at all times during the nursing. [4]
Two major types of activity have been observed in masked titis. The first is characterized by two feeding periods separated by a relatively long resting period. The two feeding periods are in different locations in which a significant portion of the day was spent traveling to the second location to feed. The second activity pattern contained three feeding periods also separated by resting periods. However, travel was much more evenly dispersed throughout the day in this pattern. Each feeding period lasted approximately 2–3 hours, and traveling usually consumed approximately 20% of their day. [6]
Masked titis do have territorial displays throughout the day. The defend their territories by loud intergroup vocalizations to other groups of monkeys and to other animals in the general area. Additionally, all titi monkeys have "Dawn Calls" in the mornings in which the male and female usually duet the same song. [6]
The Pitheciidae are one of the five families of New World monkeys now recognised. Formerly, they were included in the family Atelidae. The family includes the titis, saki monkeys and uakaris. Most species are native to the Amazon region of Brazil, with some being found from Colombia in the north to Bolivia in the south.
Geophagia, also known as geophagy, is the intentional practice of eating earth or soil-like substances such as clay, chalk, or termite mounds. It is a behavioural adaptation that occurs in many non-human animals and has been documented in more than 100 primate species. Geophagy in non-human primates is primarily used for protection from parasites, to provide mineral supplements and to help metabolize toxic compounds from leaves. Geophagy also occurs in humans and is most commonly reported among children and pregnant women.
The titis, or titi monkeys, are New World monkeys of the subfamily Callicebinae, which contains three extant genera: Cheracebus, Callicebus, and Plecturocebus. This subfamily also contains the extinct genera Miocallicebus, Homunculus, and Carlocebus.
Callicebus is a genus of monkeys known as titi monkeys.
The Indian pangolin, also called thick-tailed pangolin and scaly anteater, is a pangolin native to the Indian subcontinent. Like other pangolins, it has large, overlapping scales on its body which act as armour. The colour of its scales varies depending on the colour of the earth in its surroundings. It can also curl itself into a ball as self-defence against predators such as the tiger. It is an insectivore feeding on ants and termites, digging them out of mounds and logs using its long claws, which are as long as its fore limbs. It is nocturnal and rests in deep burrows during the day.
The collared titi monkey is a species of titi, a type of New World monkey. It is endemic to northern Brazil.
The black-fronted titi monkey is a species of titi, a type of New World monkey.
The coastal black-handed titi monkey is a species of titi, a type of New World monkey, endemic to Brazil.
The white-eared titi monkey also known as the Bolivian titi or Bolivian gray titi, is a species of titi monkey, a type of New World monkey, from eastern Bolivia and an area of western Brazil. The species has a range that extends east from the Manique River in Beni Department, Bolivia to southern Rondônia in Brazil. The southern end of its range includes forests around the city of Santa Cruz de la Sierra.
The coppery titi monkey or red titi monkey is a species of titi monkey, a type of New World monkey, from South America. They are found in the Amazon of Brazil and Peru, and perhaps northern Bolivia. It was described as Callithrix cupreus in 1823. These monkeys have a lifespan of a little over 20 years. These monkeys eat certain fruits, insects, and plants. They live in monogamous pairs with interesting ways for vocalizing and protecting themselves from predators.
Coimbra Filho's titi monkey or just Coimbra's titi is a species of titi, a type of New World monkey, endemic to forests in the Brazilian states of Bahia and Sergipe. It was first discovered by Shuji Kobayashi. It is considered one of the most endangered of all Neotropical primates. It is named after Adelmar F. Coimbra-Filho, founder and Former Director of the Rio de Janeiro Primate Centre, in honor of his work in the field of Brazilian primatology and biology.
Prince Bernhard's titi monkey, also called the zog-zog monkey, is a species of titi monkey in the genus Plecturocebus, first described in 2002. It is named after Prince Bernhard of the Netherlands. They have varying coloration of gray, black, and agouti, with dark orange in certain regions. They are endemic to Brazil, found mostly in disturbed forest environments. While officially listed as least-concern by the International Union for the Conservation of Nature (IUCN), they may, in fact, be at-risk due to human-caused deforestation.
Barbara Brown's titi monkey, also popularly known as the blond titi monkey or northern Bahian blond titi, is a species of titi, a type of New World monkey. This critically endangered species is endemic to the Caatinga in northeastern Brazil, and it is estimated that less than 250 mature individuals remain. It is named after the zoologist Barbara Elaine Russell Brown.
The Rio Mayo titi monkey is a species of titi monkey, a type of New World monkey, endemic to Peru. The Rio Mayo titi, was thought previously to have a small range of origin in the Alto Mayo valley, but research has proven that the range extends southward and reaches the Huayamba River, as well as Bajo Mayo. It had been classified as vulnerable but due to major habitat loss and restricted living space, it is now classified as Critically Endangered. In October 2012, it was included in The World's 25 Most Endangered Primates list. An increase in deforestation is leading to the decrease in available living space for this titi monkey, forcing it to live in sympatry with another species of Callicebus. Yet in some areas, such drastic deforestation has resulted in extremely high population density. The Rio Mayo titi is better adapted to moderately populated areas, thus overpopulation negatively impacts the species. The forests the Rio Mayo titi lives in are being destroyed for agricultural purposes, leaving little forest for the monkeys. They were only seen a few times and featured in museums until 2003 when more research was done on them. In order for this species to survive, their forests need to be protected to avoid overpopulation. Different conservation groups are working to help P. oenanthe survive. Neotropical Primate Conservation, Proyecto Mono Tocón and Amazónicos para la Amazonia are working in the more southern areas to protect the monkey. The Rio Mayo titi is a fairly inconspicuous creature, making observation and research difficult to obtain. Therefore, the traditional use of transect observation to monitor the monkey's population, is less effective. Instead, other methods of calculating the titi monkey's density in certain areas have been taken, such as research into the species-specific calls endemic to a certain area.
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The yellow-chevroned parakeet is native to tropical South America south of the Amazon River basin from central Brazil to southern Bolivia, Paraguay, and northern Argentina. Caged birds have been released in some areas, and the birds have established self-sustaining populations in the Miami, Florida, and Los Angeles and San Francisco, California. This bird seems to be doing better in its North American feral population than the closely related white-winged parakeet. The species is also established in the downtown area of Rio de Janeiro, Brazil; and in Buenos Aires, Argentina; where it was introduced. The native population in South America continues to do well.
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Plecturocebus is one of three genera of titi monkeys.
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