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Denise Früh, Stefan Stoll and Peter Haase Physico-chemical variables determining the invasion risk of freshwater habitats by alien mollusks and crustaceans Ecology and Evolution 2

Article first published online: 11 OCT 2012 | DOI: 10.1002/ece3.382

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The aim of this study was to assess the invasion risk of freshwater habitats and determine the environmental variables that are most favorable for the establishment of alien amphipods, isopods, gastropods, and bivalves. We analyzed presence-absence data of alien and indigenous amphipods, isopods, gastropods, and bivalves with regard to eight environmental variables: chloride, ammonium, nitrate, oxygen, orthophosphate, distance to the next navigable waterway, and maximum and minimum temperature, respectively. Degraded sites close to navigable waters were exposed to an increased invasion risk by all major groups of alien species. Increased temperature and chloride concentration as well as decreased oxygen concentration were identified as major factors for the invasibility of a site.

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