habitat fragmentation Argentina 26 Aves 18 bird 16 Atlantic forest 10 Ecosystem 10 Atlantic Forest 8 anthropogenic effect 8 article 8 habitat conservation 8 land use 8 landscape ecology 8 Birds 6 Bos 6 Conservation of Natural Resources 6 Land use 6 Models, Theoretical 6 Paraguay 6 abundance 6 community structure 6 controlled study 6 edge effect 6 endangered species 6 forest cover 6 habitat 6 habitat cover 6 habitat loss 6 native species 6 species richness 6 tree 6