Association of landscape and environmental variables with the recruitment of the freshwater pearl mussel (Margaritifera margaritifera) in Norway

Using data from 309 localities with freshwater pearl mussel, Margaritifera margaritifera, in Norway, we analyzed the effect of several landscape and environmental variables on this species’ recruitment. Median summer air temperature and, to a lesser extent, percentage wetland cover in the catchment were the strongest (negative) influences on recruitment. This is the first study to show an effect of air temperature on recruitment across a wide range of populations. The results are of importance for the conservation of the species, particularly in the context of climate change.