Abstract
Habitat fragmentation is one of the major threats to biodiversity the impacts of which is usually measured by species richness. However, changes in species richness do not inform about the consequences on ecosystem functioning and other measures, such as functional diversity, are needed. Primates represent between 25 and 40% of tropical frugivore biomass and are considered to play a key role in forest maintenance and regeneration through their seed dispersal function. Despite providing important ecosystem services, little is known about the consequences of primate extinctions on ecosystem functioning. Working at three spatial scales, this project aims at determining 1) the inter-continental differences of the effects of forest fragmentation on primate functional diversity, 2) how does forest fragmentation affect more particularly the primates of the Brazilian Atlantic forest, and 3) whether seed dispersal services provided by primates living in fragments are disrupted by fragmentation through ecological, behavioral and physiological changes. The two first questions will be answered by using functional diversity indices and a large database of occurrence and functional traits of the primates in fragments around the world. At the smallest scale, the black-lion-tamarin, Leontopithecus chrysopygus, whose habitat is one of the most fragmented among primates of the Atlantic Forest, will be used as a model. Their seed dispersal effectiveness and stress level will be compared between fragments and a continuous forest and linked to ecological and behavioral data. Three wild groups will be followed to gather data on home range use, diet, time budget and seed dispersal that will allow validating a model of the movements and seed rain of L. chrysopygus in a fragmented landscape. The application of the model to other fragments where L. chrysopygus occurs will allow determining how the seed dispersal traits vary with landscape characteristics. This project aims at establishing the bases needed to the management of L. chrysopygus populations in order to ensure the survival of the species and its associated services to the ecosystem. (AU)
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