科研之友
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摘要
The Atlantic forest of Brazil is extremely fragmented. This fragmentation has had a toll on the mammal's assemblages. Although different species are not equally susceptible to fragmentation, populations of some species have become locally extinct. Primate populations in these fragments are in decline or have gone locally extinct. However, there is a dearth of information on density of primates in the highly fragmented Atlantic forest of NE Brazil. We conducted a series of censuses to record primates and other mammals in the Pacatuba semi deciduous forest (similar to 267 ha). Most of the midsized and large mammals disappeared, even fragment-tolerant species such as sloths and coatis are missing in the area. Currently, marmosets (Callithrix jacchus Linnaeus, 1758) and red handed howlers (Alouatta belzebul Linnaeus, 1766) are the most abundant species. Howlers preferred areas with larger trees and marmosets were more common in edge habitat. Marmosets were the most abundant species (264 individual/km(2)). Howlers attained the highest densities recorded so far in the Atlantic forest (94.7 individual/km(2)), and the fragment is probably hyper abundant with howlers. The high availability of larger trees and fruit resources combined with the lack of natural predators, the reduced possibility of dispersal and the semi-deciduousness of the forest could explain these results.
- 出版日期2017-7
