Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Biodiversity and land-use change
T2 - understanding the complex responses of an endemic-rich bird assemblage
AU - de Lima, Ricardo Faustino
AU - Dallimer, Martin
AU - Atkinson, Philip W.
AU - Barlow, Jos
PY - 2013/4
Y1 - 2013/4
N2 - Aim Anthropogenic land-use change is a major driver of the current extinction crisis, but the processes through which it acts on biodiversity are complex and still poorly understood. Here, we use several biodiversity metrics to make a comprehensive assessment of the response of an endemic-rich bird assemblage to land-use change. Location SAo Tome Island (SAo Tome and Principe, Africa). Methods We sampled bird assemblages in 220 point counts, stratified across three regions and four land-use types. Species richness was examined using accumulation curves and generalized linear mixed-effect models. Compositional and structural changes were analysed with ordination techniques. We used correlations and model selection to identify species traits and environmental variables associated with such changes. Results At the point level, there was a slight decrease of species richness in more intensive land uses. However, higher dissimilarities within these land uses led them to have higher overall species richness. Endemics dominated forest environments and, although most preferred less-disturbed land uses, many persisted across all land uses. Non-endemics were virtually absent from forests, but became very abundant in the more intensive land uses. Canopy cover was the best predictor of the shift between endemic and non-endemic species, and allowed identifying regional differences in the local responses of bird assemblages to land-use change. Main conclusions To better understand biodiversity, it is crucial to use several metrics simultaneously. In SAo Tome, simply using species richness, the single most used biodiversity metric, could have been misleading as it concealed major shifts in the bird assemblage structure towards an endemism impoverished avifauna. Despite scarce data on land-use cover, we demonstrate how landscape context can be vital to understand biodiversity patterns and that highly forested surroundings might overestimate the strict value of more intensive land uses. Our results raise concerns about the long-term persistence of endemic species restricted to islands where forested land uses are being lost.
AB - Aim Anthropogenic land-use change is a major driver of the current extinction crisis, but the processes through which it acts on biodiversity are complex and still poorly understood. Here, we use several biodiversity metrics to make a comprehensive assessment of the response of an endemic-rich bird assemblage to land-use change. Location SAo Tome Island (SAo Tome and Principe, Africa). Methods We sampled bird assemblages in 220 point counts, stratified across three regions and four land-use types. Species richness was examined using accumulation curves and generalized linear mixed-effect models. Compositional and structural changes were analysed with ordination techniques. We used correlations and model selection to identify species traits and environmental variables associated with such changes. Results At the point level, there was a slight decrease of species richness in more intensive land uses. However, higher dissimilarities within these land uses led them to have higher overall species richness. Endemics dominated forest environments and, although most preferred less-disturbed land uses, many persisted across all land uses. Non-endemics were virtually absent from forests, but became very abundant in the more intensive land uses. Canopy cover was the best predictor of the shift between endemic and non-endemic species, and allowed identifying regional differences in the local responses of bird assemblages to land-use change. Main conclusions To better understand biodiversity, it is crucial to use several metrics simultaneously. In SAo Tome, simply using species richness, the single most used biodiversity metric, could have been misleading as it concealed major shifts in the bird assemblage structure towards an endemism impoverished avifauna. Despite scarce data on land-use cover, we demonstrate how landscape context can be vital to understand biodiversity patterns and that highly forested surroundings might overestimate the strict value of more intensive land uses. Our results raise concerns about the long-term persistence of endemic species restricted to islands where forested land uses are being lost.
KW - DEFORESTATION
KW - landscape context
KW - assemblage composition and structure
KW - PATTERNS
KW - TOME-AND-PRINCIPE
KW - DIVERSITY
KW - ISLAND
KW - tropical forest
KW - SPECIES RICHNESS
KW - species richness
KW - biodiversity loss
KW - FOREST
KW - SAo Tome island
KW - LANDSCAPES
KW - AGRICULTURAL SUSTAINABILITY
KW - CONSERVATION
U2 - 10.1111/ddi.12015
DO - 10.1111/ddi.12015
M3 - Journal article
VL - 19
SP - 411
EP - 422
JO - Diversity and Distributions
JF - Diversity and Distributions
SN - 1366-9516
IS - 4
ER -