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Influence of habitat amount, fragment size and connectivity in Atlantic Forest bird species conservation

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Martensen, Alexandre Camargo
Total Authors: 1
Document type: Master's Dissertation
Press: São Paulo. [2008]. 159 f., ilustrações.
Institution: Universidade de São Paulo (USP). Instituto de Biociências
Defense date:
Examining board members:
Metzger, Jean Paul Walter; Batista, João Luis Ferreira; Frische, Cintia Cornelius
Advisor: Metzger, Jean Paul Walter
Field of knowledge: Biological Sciences - Ecology
Indexed in: Banco de Dados Bibliográficos da USP-DEDALUS; Biblioteca Digital de Teses e Dissertações - USP
Location: Universidade de São Paulo. Biblioteca do Instituto de Biociências; IB/M-1360

Landscape aspects such as habitat amount, fragment size and connectivity, have been suggested as key features for maintaining species in altered landscapes, and thus are essential to be modeled and comprehended for management and conservation purposes. To test their effects on understory Atlantic forest bird species, we built models with variables representing fragment size and functional connectivity in 3 landscapes with different proportions of forest (14, 31 and 45%), and confronted with data from more than 4,818 individuals captured in 53 fragments of different sizes (2.06 to 158.45 ha) and connectivitys (connected by corridors, or by short distances), and then we ranked under a model selection approach (AIC). A total of 117 species were recorded, and the landscape with higher amount of forest was richer (87) than the two others which presented a similar lower richness (62 and 70), what suggests a threshold amount of habitat between 32 to 44%. Configuration aspects were important in all cases; however, different characteristics influenced species richness and abundance in each landscape. Patch size was important in determining species richness and abundance in the landscape with low amount of habitat, while connectivity aspects were crucial in the landscapes with higher amounts of habitat. Within the connectivity models, particularly the ones that take in to account the connectivity by corridors, but also the ones that consider short movements through the matrix are far better supported, then the ones by longer distances gaps... (AU)

FAPESP's process: 04/11279-7 - Conservation of understory birds in fragmented landscapes: importance of cover and configuration of the habitat
Grantee:Alexandre Camargo Martensen
Support type: Scholarships in Brazil - Master