%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Quenta, E.
%A Molina-Rodriguez, J.
%A Gonzales, K.
%A Rebaudo, François
%A Casas, J.
%A Jacobsen, D.
%A Dangles, Olivier
%T Direct and indirect effects of glaciers on aquatic biodiversity in high Andean peatlands
%D 2016
%L fdi:010067764
%G ENG
%J Global Change Biology
%@ 1354-1013
%K aquatic biodiversity ; environmental heterogeneity ; glacial influence ; high Andean peatlands ; peatland area ; tropical Andes
%K BOLIVIE ; ANDES ; ZONE TROPICALE ; CORDILLERA REAL
%M ISI:000381077300020
%N 9
%P 3196-3205
%R 10.1111/gcb.13310
%U https://www.documentation.ird.fr/hor/fdi:010067764
%> https://www.documentation.ird.fr/intranet/publi/2016/09/010067764.pdf
%V 22
%W Horizon (IRD)
%X The rapid melting of glacier cover is one of the most obvious impacts of climate change on alpine ecosystems and biodiversity. Our understanding of the impact of a decrease in glacier runoff on aquatic biodiversity is currently based on the glacier-heterogeneity-diversity' paradigm, according to which there is high -diversity at intermediate levels of glacial influence due to the high degree of environmental heterogeneity caused by glacier water. This -diversity pattern generates high levels of between-site aquatic community variation (high diversity) and increases regional diversity (-diversity). There is a rich conceptual background in favor of this paradigm, but empirical data supporting it are scarce. We investigated this paradigm by analyzing the different diversity patterns (, and -diversity) of four aquatic groups (zooplankton, macroinvertebrates, algae and macrophytes) living in high-elevation peatlands (>4500m above sea level). We sampled 200 pools from 20 peatlands along a glacier gradient in the Cordillera Real of Bolivia. We performed structural equationmodeling (SEM) to analyze the potential mechanisms underlying the observed diversity patterns. Intermediate levels of glacial influence (15-20% cover) resulted in high heterogeneity, but -diversity responded to glacial influence only for the zooplankton group (Cladocera). Our SEM analysis did not identify environmental heterogeneity as a significant variable explaining the relationship between glacier and -diversity. Peatland area had a strong positive effect on heterogeneity and diversity. -diversity was significantly associated with glacier gradient, and 12.9% of the total regional diversity (-diversity) was restricted to peatlands with a high degree of glacial influence. These species might be lost in a context of glacial retreat. These findings provide new insight into the potential effects of glacial retreat on the aquatic environment and biodiversity in the peatlands of the tropical Andes.
%$ 036 ; 082