Бурощекий тамарин: экология, поведение и коммуникация.

Species of New World monkey

The brown mantled tamarin (Leontocebus fuscicollis), also known as Spix's saddle back tamarin, is a species of saddle back tamarin. This New World monkey is found in the Southern American countries of Bolivia, Brazil and Peru. This omnivorous member of the Callitrichidae family is usually found in smaller groups ranging between 4 and 15 individuals. This species communicates vocally and largely rely their olfactory system. The brown mantled tamarin is considered as a species of Least Concern by the International Union for Conservation of Nature, despite a decreasing population and being threatened by poaching, habitat loss and capture for the illegal pet trade.

This species is eats both plant and animal matter, feeding on fruits, flowers, nectar, eggs, and smaller animals including snails, lizards, tree frogs and insects. They do not however use their vocalization skill as their main form of communication, the brown mantled tamarin will sound alarm calls when in proximity of potential danger from intruders or predators, individuals will respond to the alarm calls which aids in determining the location of each group member. Due to the geographic distribution of the brown mantled tamarin, their territory often overlaps with that of other primate species and it is not uncommon for different species such as the moustached tamarin to respond to their calls, even though every species has a different sounding alarm calls.

This species possess a well developed olfactory communication system with specialized glands in the anogenital, suprapubic, and sternal regions, they can perceive information about species, subspecies, sex, and individual identity in the sender's scent marks as well as females relaying the status of their reproductive condition through their scents. Olfactory communication is substantially different from other forms of communication, scent marks are deposited in the substrate and can be detected long after they were deposited. There are three functional motives for scent marking behavior amongst New World primates which include territorial function, regulation of social and reproductive dominance and mate attraction. The use of scent marking for territorial defense was hypothesized to be one of the main functions within brown mantled tamarins, as they typically would mark more on the periphery of their area of territory, however spatial patterns of scent marking failed to reveal a consistent pattern and that there is no difference in the pattern of scent marking between exclusive and overlap areas rather that the distribution of scent marking was correlated with the intensity of home range use. Although scent marking may not be primarily as a mechanism for defending their territory, it does serve a purpose to neighboring groups and intruders, as the territory of brown mantled tamarins overlaps the territory of many other primates, scent marking is a strategy used to communicate with other groups to reduce aggressive intergroup encounters. A secondary use of olfactory communication can be found for reproductive functions where females will release certain pheromones within their territory to convey their reproductive status as a way to find a mating partner or to prevent other females within the group from breeding. It has been found that males within the group may deposit his own scent mark over the secretions of females as a strategy to claim the female as his copulation partner. Generally, these glandular secretions will be deposited on branches or trees but can occasionally be deposited on other primates known as allomarking.

Groups of brown mantled tamarins typically involve two or more adult males and a single reproductive female. It is common within this species that the dominant female births twins which are cared for by all group members. Polyandry is more common within groups of brown mantled tamarins because of the high frequency of twin births making it difficult for the mother to take care of her offspring's at once, as a result, alloparenting highly prevails where nonreproductive helpers and polyandrous males aid with infant care. The breeding male typically carries the infants until they are 90 days old, only passing them back to their mother for feeding. The gestation period for this species is roughly 150 days and babies are not fully weaned from their mothers until 3–4 months and reach maturity at the age of 2.

The brown mantled tamarin is listed as Least concern species by the International Union for Conservation of Nature (IUCN) but is slowly becoming in danger of extinction through destruction of habitat for logging or clearing of land for farming, poaching and being captured for the illegal pet trade.