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Drivers and interrelationships among multiple dimensions of rarity for freshwater fishes [Ecography]

par Frédéric Magné - publié le

Species can be rare or common in three different dimensions : geographic range size, habitat breadth, and local abundance. Understanding drivers of rarity are not only fundamentally interesting ; it is also pertinent for their conservation. We addressed this challenge by analyzing the rarity of 291 native freshwater fishes occurring in ca 3500 independent stream reaches that span a broad environmental gradient across continental USA. Using phylogenetic regression and path analysis, we examined the concordance among the three rarity dimensions, and identified possible mechanisms by which species life-history, habitat affinities, and biogeography drive variation in rarity.(...)

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