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Título: Pervasive defaunation of forest remnants in a tropical biodiversity hotspot
Autor: Canale, Gustavo Rodrigues
Peres, Carlos A.
Guidorizzi, Carlos Eduardo
Gatto, Cassiano Augusto Ferreira Rodrigues
Kierulff, Maria Cecília Martins
Palavras-chave: Biodiversity
Environmental Protection
Population Abundance
Species Composition
Species Conservations
Species Difference
Species Extinction
Species Habitat
Species Richness
Conservation Of Natural Resources
Linear Models
Tropical Climate
Data do documento: 2012
Revista: PLoS ONE
Encontra-se em: Volume 7, Número 8
Abstract: Tropical deforestation and forest fragmentation are among the most important biodiversity conservation issues worldwide, yet local extinctions of millions of animal and plant populations stranded in unprotected forest remnants remain poorly explained. Here, we report unprecedented rates of local extinctions of medium to large-bodied mammals in one of the world's most important tropical biodiversity hotspots. We scrutinized 8,846 person-years of local knowledge to derive patch occupancy data for 18 mammal species within 196 forest patches across a 252,669-km2 study region of the Brazilian Atlantic Forest. We uncovered a staggering rate of local extinctions in the mammal fauna, with only 767 from a possible 3,528 populations still persisting. On average, forest patches retained 3.9 out of 18 potential species occupancies, and geographic ranges had contracted to 0-14.4% of their former distributions, including five large-bodied species that had been extirpated at a regional scale. Forest fragments were highly accessible to hunters and exposed to edge effects and fires, thereby severely diminishing the predictive power of species-area relationships, with the power model explaining only ~9% of the variation in species richness per patch. Hence, conventional species-area curves provided over-optimistic estimates of species persistence in that most forest fragments had lost species at a much faster rate than predicted by habitat loss alone. © 2012 Canale et al.
DOI: 10.1371/journal.pone.0041671
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