Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation

Aim: 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...

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Detalles Bibliográficos
Autores: Hermoso, Virgilio, Clavero Pineda, Miguel, Kennard, Mark J.
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2011
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/69911
Acceso en línea:https://doi.org/10.1111/j.1472-4642.2011.00828.x
http://hdl.handle.net/10459.1/69911
Access Level:acceso abierto
Palabra clave:Biological invasions
Fish conservation
Habitat degradation
Introduced species
Reference condition
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spelling Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservationHermoso, VirgilioClavero Pineda, MiguelKennard, Mark J.Biological invasionsFish conservationHabitat degradationIntroduced speciesReference conditionAim: 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.The fieldwork for this study was funded by the Guadiana River basin management authority.Blackwell Publishing Ltd2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/submittedVersionhttps://doi.org/10.1111/j.1472-4642.2011.00828.xhttp://hdl.handle.net/10459.1/69911reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésVersió preprint del document publicat a: https://doi.org/10.1111/j.1472-4642.2011.00828.xDiversity and Distributions, 2012, vol. 18, núm. 3, p. 236-247(c) Blackwell Publishing Ltd, 2011info:eu-repo/semantics/openAccessoai:repositori.udl.cat:10459.1/699112026-06-24T12:42:17Z
dc.title.none.fl_str_mv Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
title Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
spellingShingle Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
Hermoso, Virgilio
Biological invasions
Fish conservation
Habitat degradation
Introduced species
Reference condition
title_short Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
title_full Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
title_fullStr Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
title_full_unstemmed Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
title_sort Determinants of fine‐scale homogenization and differentiation of native freshwater fish faunas in a Mediterranean Basin: implications for conservation
dc.creator.none.fl_str_mv Hermoso, Virgilio
Clavero Pineda, Miguel
Kennard, Mark J.
author Hermoso, Virgilio
author_facet Hermoso, Virgilio
Clavero Pineda, Miguel
Kennard, Mark J.
author_role author
author2 Clavero Pineda, Miguel
Kennard, Mark J.
author2_role author
author
dc.subject.none.fl_str_mv Biological invasions
Fish conservation
Habitat degradation
Introduced species
Reference condition
topic Biological invasions
Fish conservation
Habitat degradation
Introduced species
Reference condition
description Aim: 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.
publishDate 2011
dc.date.none.fl_str_mv 2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1111/j.1472-4642.2011.00828.x
http://hdl.handle.net/10459.1/69911
url https://doi.org/10.1111/j.1472-4642.2011.00828.x
http://hdl.handle.net/10459.1/69911
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió preprint del document publicat a: https://doi.org/10.1111/j.1472-4642.2011.00828.x
Diversity and Distributions, 2012, vol. 18, núm. 3, p. 236-247
dc.rights.none.fl_str_mv (c) Blackwell Publishing Ltd, 2011
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Blackwell Publishing Ltd, 2011
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Blackwell Publishing Ltd
publisher.none.fl_str_mv Blackwell Publishing Ltd
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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