L'utilisation d'espèces indicatrices dans un contexte de changement climatique : cas des oiseaux de l'est de la forêt boréale canadienne

Authors: Terrigeol, Alexandre
Advisor: Fortin, Daniel; Darveau, Marcel
Abstract: Many constraints can impede the broad-scale monitoring needed to assess and mitigate human-induced loss of biodiversity. The use of indicator species of species assemblage can simplify the monitoring of biodiversity based on a limited number of species. Despite promising fine-scale studies, it remains unclear whether indicator species remain effective over broad spatial extents. Using 22,041 point-counts coming from breeding bird atlases, we assessed the value of indicator species to consistently predict bird species richness despite variation in climate conditions observed over 1.75 M km2 of boreal forest. To test for the effect of climate conditions on species assemblages, we partitioned our study area into eight relatively similar climatic regions. Using null model analyses of species co-occurrence, we identified the minimum number of indicator species required to predict 70% of the variation in species richness in each of the climatic regions. Although we were able to identify a small number of indicator species in each climatic region, we observed that the identity of indicator species varied strongly among regions. When species remained an indicator in several climatic regions, they were representative of different species assemblages. This study shows that species currently identified as indicators may no longer indicate the same species assemblage in a near future. Broad-scale use of indicators thus comes with the challenge of having to determine under which new conditions a given set of indicators must be replaced by another, and by which one.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 1 June 2021
Permalink: http://hdl.handle.net/20.500.11794/69249
Grantor: Université Laval
Collection:Thèses et mémoires

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