Biodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes - Archive ouverte HAL Access content directly
Journal Articles Conservation Biology Year : 2018

Biodiversity loss along a gradient of deforestation in Amazonian agricultural landscapes

Xavier Arnauld de Sartre
George Brown
  • Function : Author

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.
Fichier principal
Vignette du fichier
decans2018.pdf (505.87 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-01922346 , version 1 (27-11-2018)

Identifiers

Cite

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, 2018, 32 (6), pp.1380 - 1391. ⟨10.1111/cobi.13206⟩. ⟨hal-01922346⟩
822 View
2236 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More