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Global correlates of extinction risk in freshwater crayfish [Animal Conservation]

Keywords : IUCN Red List, crayfish, extinction risk, freshwater invertebrate, threat mapping, phylogenetic regression models

par Frédéric Magné - publié le

Global trait-based analyses can shed light on the factors predisposing species to high extinction risk, and can help bridge knowledge gaps in speciose and poorly known taxa. In this paper, I conduct the first global comparative study of crayfish extinction risk. I collated data on intrinsic (biology and ecology) and extrinsic (environment and threats) factors for 450 crayfish species assessed on the IUCN Red List. Phylogenetic multiple regression models were used to identify correlates of risk in all species ; in centres of diversity (American cambarids and Australian parastacids) ; and among threat types (agriculture, water management, pollution). I assessed the relative ability of threat maps quantifying specific threats (e.g. river fragmentation, mercury deposition) or a generic threat (human population density) to predict crayfish extinction risk.(...)

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