Zoogeography, ecology, and conservation status of the large freshwater mussels in Sweden.
The Swedish fauna of native Unionids contains one Margaritiferidae species, six Unionidae species and four non-native species, one Unionidae, two Dreissenidae and one Mactridae. This is the first attempt to describe the Swedish freshwater mussel species in detail and put them in context with zoogeography, ecology, and conservation status. Detailed distribution maps for all species, based on all available material in museum collections, databases and literature are presented. Details in the distributions, and possible causes for the different geographical patterns exhibited, especially the so called limes norrlandicus-an important biogeographical transition zone in Central Sweden-are discussed. Information on the ecology, especially host fish species, and conservation status and projects are also given.