Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss

Mediterranean endemic freshwater fish are among the most threatened biota in the world. Distinguishing the role of different extinction drivers and their potential interactions is crucial for achieving conservation goals. While some authors argue that invasive species are a main driver of native spe...

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Autores: Hermoso, Virgilio, Clavero Pineda, Miguel, Blanco-Garrido, Francisco, Prenda, José
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2011
País:España
Recursos:Universitat de Lleida (UdL)
Repositório:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/69121
Acesso em linha:https://doi.org/10.1890/09-2011.1
http://hdl.handle.net/10459.1/69121
Access Level:Acceso aberto
Palavra-chave:Animals invasors
Ecologia d'aigua dolça
Peixos d'aigua dolça
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spelling Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity lossHermoso, VirgilioClavero Pineda, MiguelBlanco-Garrido, FranciscoPrenda, JoséAnimals invasorsEcologia d'aigua dolçaPeixos d'aigua dolçaMediterranean endemic freshwater fish are among the most threatened biota in the world. Distinguishing the role of different extinction drivers and their potential interactions is crucial for achieving conservation goals. While some authors argue that invasive species are a main driver of native species declines, others see their proliferation as a co‐occurring process to biodiversity loss driven by habitat degradation. It is difficult to discern between the two potential causes given that few invaded ecosystems are free from habitat degradation, and that both factors may interact in different ways. Here we analyze the relative importance of habitat degradation and invasive species in the decline of native fish assemblages in the Guadiana River basin (southwestern Iberian Peninsula) using an information theoretic approach to evaluate interaction pathways between invasive species and habitat degradation (structural equation modeling, SEM). We also tested the possible changes in the functional relationships between invasive and native species, measured as the per capita effect of invasive species, using ANCOVA. We found that the abundance of invasive species was the best single predictor of natives' decline and had the highest Akaike weight among the set of predictor variables examined. Habitat degradation neither played an active role nor influenced the per capita effect of invasive species on natives. Our analyses indicated that downstream reaches and areas close to reservoirs had the most invaded fish assemblages, independently of their habitat degradation status. The proliferation of invasive species poses a strong threat to the persistence of native assemblages in highly fluctuating environments. Therefore, conservation efforts to reduce native freshwater fish diversity loss in Mediterranean rivers should focus on mitigating the effect of invasive species and preventing future invasions.The fieldwork was funded by the Confederación Hidrográfica del Guadiana through the project “Diseño y Explotación de la Red de Control Biológico de la Cuenca del Río Guadiana” and the Ministry of Science and Technology (REN2002‐03513, CGL2005‐02699). V. Hermoso held a pre‐doctoral fellowship funded by the Spanish Ministry of Education (MEC) (AP‐2004‐1414). M. Clavero benefited from a Juan de la Cierva contract also funded by MEC.Ecological Society of America2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://doi.org/10.1890/09-2011.1http://hdl.handle.net/10459.1/69121reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)Inglésinfo:eu-repo/grantAgreement/MICYT//REN2002-03513info:eu-repo/grantAgreement/MEC//CGL2005-02699Reproducció del document publicat a: https://doi.org/10.1890/09-2011.1Ecological Applications, 2011, vol. 21, núm. 1, p. 175-188(c) Ecological Society of America, 2011info:eu-repo/semantics/openAccessoai:repositori.udl.cat:10459.1/691212026-06-24T12:42:17Z
dc.title.none.fl_str_mv Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
title Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
spellingShingle Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
Hermoso, Virgilio
Animals invasors
Ecologia d'aigua dolça
Peixos d'aigua dolça
title_short Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
title_full Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
title_fullStr Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
title_full_unstemmed Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
title_sort Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss
dc.creator.none.fl_str_mv Hermoso, Virgilio
Clavero Pineda, Miguel
Blanco-Garrido, Francisco
Prenda, José
author Hermoso, Virgilio
author_facet Hermoso, Virgilio
Clavero Pineda, Miguel
Blanco-Garrido, Francisco
Prenda, José
author_role author
author2 Clavero Pineda, Miguel
Blanco-Garrido, Francisco
Prenda, José
author2_role author
author
author
dc.subject.none.fl_str_mv Animals invasors
Ecologia d'aigua dolça
Peixos d'aigua dolça
topic Animals invasors
Ecologia d'aigua dolça
Peixos d'aigua dolça
description Mediterranean endemic freshwater fish are among the most threatened biota in the world. Distinguishing the role of different extinction drivers and their potential interactions is crucial for achieving conservation goals. While some authors argue that invasive species are a main driver of native species declines, others see their proliferation as a co‐occurring process to biodiversity loss driven by habitat degradation. It is difficult to discern between the two potential causes given that few invaded ecosystems are free from habitat degradation, and that both factors may interact in different ways. Here we analyze the relative importance of habitat degradation and invasive species in the decline of native fish assemblages in the Guadiana River basin (southwestern Iberian Peninsula) using an information theoretic approach to evaluate interaction pathways between invasive species and habitat degradation (structural equation modeling, SEM). We also tested the possible changes in the functional relationships between invasive and native species, measured as the per capita effect of invasive species, using ANCOVA. We found that the abundance of invasive species was the best single predictor of natives' decline and had the highest Akaike weight among the set of predictor variables examined. Habitat degradation neither played an active role nor influenced the per capita effect of invasive species on natives. Our analyses indicated that downstream reaches and areas close to reservoirs had the most invaded fish assemblages, independently of their habitat degradation status. The proliferation of invasive species poses a strong threat to the persistence of native assemblages in highly fluctuating environments. Therefore, conservation efforts to reduce native freshwater fish diversity loss in Mediterranean rivers should focus on mitigating the effect of invasive species and preventing future invasions.
publishDate 2011
dc.date.none.fl_str_mv 2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1890/09-2011.1
http://hdl.handle.net/10459.1/69121
url https://doi.org/10.1890/09-2011.1
http://hdl.handle.net/10459.1/69121
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/MICYT//REN2002-03513
info:eu-repo/grantAgreement/MEC//CGL2005-02699
Reproducció del document publicat a: https://doi.org/10.1890/09-2011.1
Ecological Applications, 2011, vol. 21, núm. 1, p. 175-188
dc.rights.none.fl_str_mv (c) Ecological Society of America, 2011
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Ecological Society of America, 2011
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Ecological Society of America
publisher.none.fl_str_mv Ecological Society of America
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
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repository.mail.fl_str_mv
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