@ARTICLE{TreeBASE2Ref22593, author = {Angela Strecker and Julian Olden}, title = {Fish species introductions provide novel insights into the patterns and drivers of phylogenetic structure in freshwaters }, year = {2013}, keywords = {community phylogenetics, desert ecology, Lower Colorado River Basin, biogeography}, doi = {}, url = {http://}, pmid = {}, journal = {Proceedings of the Royal Society of London, Biological Sciences, Biology Letters}, volume = {}, number = {}, pages = {}, abstract = {Despite longstanding interest from terrestrial ecologists, freshwater ecosystems are a fertile, yet unappreciated, testing ground for applying community phylogenetics to uncover mechanisms of species assembly. We quantify phylogenetic clustering and overdispersion for native and non-native fishes of a large river basin in the American Southwest to test for the mechanisms (environmental filtering vs. competitive exclusion) and spatial scales influencing community structure. Contrary to expectations, non-native species were phylogenetically clustered and related to natural environmental conditions, whereas native species were not phylogenetically structured, likely reflecting human-related changes to the basin. The species that are most invasive (in terms of ecological impacts) tended to be most phylogenetically divergent from natives across watersheds, but not within watersheds, supporting the hypothesis that Darwin?s naturalization conundrum is driven by spatial scale. Phylogenetic distinctiveness may facilitate non-native establishment at regional scales, but environmental filtering restricts local membership to closely-related species with physiological tolerances for current environments. By contrast, native species may have been phylogenetically clustered in historical times, but species loss from contemporary populations by anthropogenic activities has likely shaped the phylogenetic signal. Our study implies that fundamental mechanisms of community assembly have changed, with fundamental consequences for the biogeography of both native and non-native species. } }

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