Published In
Proceedings of the Royal Society – B
Document Type
Post-Print
Publication Date
1-22-2014
Subjects
Freshwater ecology, Fishes -- Phylogeny, Phylogenetics, Fish diversity
Abstract
Despite long-standing interest of 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 of native and non-native fishes of a large river basin in the American Southwest to test for the mechanisms (environmental filtering versus 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 the most phylogenetically divergent from natives across watersheds, but not within watersheds, supporting the hypothesis that Darwin's naturalization conundrum is driven by the 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.
Rights
Copyright 2014 The Author(s). Published by the Royal Society. All rights reserved.
DOI
10.1098/rspb.2013.3003
Persistent Identifier
http://archives.pdx.edu/ds/psu/11491
Citation Details
Strecker AL, Olden JD. 2014 Fish species introductions provide novel insights into the patterns and drivers of phylogenetic structure in freshwaters. Proc. R. Soc. B 281: 20133003. http://dx.doi.org/10.1098/rspb.2013.3003
Included in
Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Fresh Water Studies Commons
Description
This is an author’s manuscript that was accepted for publication in the journal Proceedings of the Royal Society - B. The definitive version can be found at http://rspb.royalsocietypublishing.org.