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The Salvelinus species is one of the most thoroughly studied groups of fishes and there are many reasons for this intense interest in charr biology. Charr have an Holarctic distribution encompassing many Asian, North American and European countries and occupy diverse marine and freshwater environments. Furthermore, the current distribution of charr includes areas that were directly influenced by climate and topographic change associated with the many Pleistocene glaciations. Undoubtedly, these conditions have promoted much of the tremendous morphological, ecological and genetic variability and plasticity within Salvelinus species and they make charr very good models to study evolutionary processes in action . Many charr species also exhibit demographic characteristics such as slow growth, late maturity and life in extreme environments, that may increase their susceptibility to extinction from habitat changes and overexploitation, especially in depauperate aquatic habitats. This vulnerability makes understanding their biology of great relevance to biodiversity and conservation. Finally, charr are of great cultural, commercial and recreational significance to many communities, and their intimate linkage with human societies has stimulated much interest in this enigmatic genus. This volume comprises of a selection of papers presented at the fourth International Charr Symposium held in Trois-Rivieres (Quebec, Canada), from 26 June to 1 July 2000. It includes 31 papers on ecological interactions and behaviour, trophic polymorphism, movement and migration, ecophysiology and evolutionary genetics, ecological parasitology, environmental stress and conservation. These studies cannot cover all recent developments in the ecology, behaviour and conservation of Salvelinus species, but collecting them into one volume should bring attention to current research on this important genus and stimulate further work on Salvelinus species.
