Reservoirs promote the taxonomic homogenization of fish communities within river basins

Clavero, Miguel and Hermoso, Virgilio (2011) Reservoirs promote the taxonomic homogenization of fish communities within river basins. Biodiversity and Conservation, 20 1: 41-57. doi:10.1007/s10531-010-9945-3

Author Clavero, Miguel
Hermoso, Virgilio
Title Reservoirs promote the taxonomic homogenization of fish communities within river basins
Journal name Biodiversity and Conservation   Check publisher's open access policy
ISSN 0960-3115
Publication date 2011-01
Sub-type Article (original research)
DOI 10.1007/s10531-010-9945-3
Volume 20
Issue 1
Start page 41
End page 57
Total pages 17
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2012
Language eng
Abstract Most studies analyzing patterns in biotic homogenization of fish communities have used large-scale approaches, while the community-level effects of species introductions and local extinctions within river basins have been sparsely analyzed. In this article, we examine patterns in freshwater fish α- and β-diversity in relation to the presence of reservoirs in a Mediterranean river (Guadiana river; Iberian Peninsula). We used fish samples from 182 river localities and 59 reservoir ones to address two main questions: (i) do reservoirs favor the establishment of invasive fish species?; and (ii) do reservoirs bear taxonomically homogenized fish communities? Although total species richness was not different between rivers and reservoirs, the latter had more invasive species and less native ones. Fish species found in reservoirs tended to be larger ones, but invasive species of any size showed higher preferences for reservoirs. Native species that were rare or absent in reservoirs were those that showed higher sensitivity to invasive species in rivers. Reservoir fish communities were taxonomically homogenized in relation to river ones, both when considering all fish species and using only natives or only invasive ones. Our results suggest that invasive species occupying reservoirs constitute an ecological filter excluding most native species from such systems. Invasive species in the study area are often widely introduced elsewhere, while native species found in reservoirs are congeneric and ecologically similar to those found in other Iberian studies. Thus, we conclude that reservoirs promote taxonomic homogenization at multiple spatial scales, while could also be promoting the functional homogenization of Iberian fish communities.
Keyword Biotic homogenization
Freshwater fish
Fish conservation
Mediterranean rivers
Invasive species
Regulated rivers
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Biological Sciences Publications
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Created: Thu, 24 Mar 2011, 11:49:14 EST by Gail Walter on behalf of School of Biological Sciences