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dc.contributor.authorHermoso, Virgilio
dc.contributor.authorClavero Pineda, Miguel
dc.contributor.authorKennard, Mark J.
dc.date.accessioned2020-11-19T09:24:13Z
dc.date.available2020-11-19T09:24:13Z
dc.date.issued2011-08-31
dc.identifier.issn1366-9516
dc.identifier.urihttp://hdl.handle.net/10459.1/69911
dc.description.abstractAim: Increasing threats to freshwater biodiversity are rapidly changing the distinctiveness of regional species pools and local assemblages. Biotic homogenization/differentiation processes are threatening the integrity and persistence of native biodiversity patterns at a range of spatial scales and pose a challenge for effective conservation planning. Here, we evaluate the extent and determinants of fine‐scale alteration in native freshwater fish assemblages among stream reaches throughout a large river basin and consider the implications of these changes for the long‐term conservation of native fishes. Location: Guadiana River basin (South‐Western Iberian Peninsula). Methods: We quantified the magnitude of change in compositional similarity between observed and reference assemblages and its potential effect on natural patterns of compositional distinctiveness. Reference assemblages were defined as the native species expected to occur naturally (in absence of anthropogenic alterations) and were reconstructed using a multivariate adaptive regression splines predictive model. We also evaluated the role of habitat degradation and introduced species as determinants of biotic homogenization/differentiation. Results: We found a significant trend towards homogenization for native fish assemblages. Changes in native fish distributions led to the loss of distinctiveness patterns along natural environmental gradients. Introduced species were the most important factor explaining the homogenization process. Homogenization of native assemblages was stronger in areas close to reservoirs and in lowland reaches where introduced species were more abundant. Main conclusions: The implementation of efficient conservation for the maintenance of native fish diversity is seriously threatened by the homogenization processes. The identification of priority areas for conservation is hindered by the fact that the most diverse communities are vanishing, which would require the selection of broader areas to adequately protect all the species. Given the principal role that introduced species play in the homogenization process and their relation with reservoirs, special attention must be paid to mitigating or preventing these threats.ca_ES
dc.description.sponsorshipThe fieldwork for this study was funded by the Guadiana River basin management authority.ca_ES
dc.language.isoengca_ES
dc.publisherBlackwell Publishing Ltdca_ES
dc.relation.isformatofVersió preprint del document publicat a: https://doi.org/10.1111/j.1472-4642.2011.00828.xca_ES
dc.relation.ispartofDiversity and Distributions, 2012, vol. 18, núm. 3, p. 236-247ca_ES
dc.rights(c) Blackwell Publishing Ltd, 2011ca_ES
dc.subjectBiological invasionsca_ES
dc.subjectFish conservationca_ES
dc.subjectHabitat degradationca_ES
dc.subjectIntroduced speciesca_ES
dc.subjectReference conditionca_ES
dc.titleDeterminants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservationca_ES
dc.typeinfo:eu-repo/semantics/articleca_ES
dc.type.versioninfo:eu-repo/semantics/submittedVersionca_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_ES
dc.identifier.doihttps://doi.org/10.1111/j.1472-4642.2011.00828.x


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