Biodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes

Thibaud Decaens 1 Marlucia Martins 2 Alex Feijoo 3 Johan Oszwald 4 Sylvain Dolédec 5 Jérôme Mathieu 6 Xavier Arnauld de Sartre 7 Diego Bonilla 8 George Brown 9 Yeimmy Andrea Cuellar Criollo 10 Florence Dubs 11, 12, 13 Ivaneide Furtado 2 Valérie Gond 14 Erika Gordillo 10 Solen Le Clec'H 4 Raphaël Marichal 15 Danielle Mitja 16, 12 Izildinha Miranda de Souza 17 Catarina Praxedes 2 Rodolphe Rougerie 18 Darío Ruiz 3 Joel Tupac Otero 19 Catalina Sanabria 20 Alex Velasquez 10 Luz Elena M. Zararte 21 Patrick Lavelle 22, 12
Abstract : Assessing how much management of agricultural landscapes, in addition to protected areas, can offset biodiversity erosion in the tropics is a central issue for conservation that still requires cross-taxonomic and landscape-scale studies. We measured the effects of Amazonia deforestation and subsequent land-use intensification in 6 agricultural areas (landscape scale), where we sampled plants and 4 animal groups (birds, earthworms, fruit flies, and moths). We assessed land-use intensification with a synthetic index based on landscape metrics (total area and relative percentages of land uses, edge density, mean patch density and diversity, and fractal structures at 5 dates from 1990 to 2007). Species richness decreased consistently as agricultural intensification increased despite slight differences in the responses of sampled groups. Globally, in moderately deforested landscapes species richness was relatively stable, and there was a clear threshold in biodiversity loss midway along the intensification gradient, mainly linked to a drop in forest cover and quality. Our results suggest anthropogenic landscapes with high-quality forest covering >40 % of the surface area may prevent biodiversity loss in Amazonia.
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Thibaud Decaens, Marlucia Martins, Alex Feijoo, Johan Oszwald, Sylvain Dolédec, et al.. Biodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes. Conservation Biology, Wiley, 2018, 32 (6), pp.1380 - 1391. ⟨10.1111/cobi.13206⟩. ⟨hal-01922346⟩

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