Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure

This study aims to contribute to the understanding of the impact of Didymosphenia geminata massive growths upon river ecosystem communities' composition and functioning. This is the first study to jointly consider the taxonomic composition and functional structure of diatom and macroinvertebrat...

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Detalhes bibliográficos
Autores: Ladrera, Rubén, Gomà Martínez, Joan, Prat i Fornells, Narcís
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2018
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositório:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/121058
Acesso em linha:https://hdl.handle.net/2445/121058
Access Level:Acceso aberto
Palavra-chave:Diatomees
Cursos d'aigua
Algues d'aigua dolça
Invasions biològiques
Diatoms
Rivers
Freshwater algae
Biological invasions
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spelling Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structureLadrera, RubénGomà Martínez, JoanPrat i Fornells, NarcísDiatomeesCursos d'aiguaAlgues d'aigua dolçaInvasions biològiquesDiatomsRiversFreshwater algaeBiological invasionsThis study aims to contribute to the understanding of the impact of Didymosphenia geminata massive growths upon river ecosystem communities' composition and functioning. This is the first study to jointly consider the taxonomic composition and functional structure of diatom and macroinvertebrate assemblages in order to determine changes in community structure, and the food web alterations associated with this invasive alga. This study was carried out in the Lumbreras River (Ebro Basin, La Rioja, Northern Spain), which has been affected by a considerable massive growth of D. geminata since 2011. The study shows a profound alteration in both the river community composition and in the food web structure at the sites affected by the massive growth, which is primarily due to the alteration of the environmental conditions, thus demonstrating that D. geminata has an important role as an ecosystem engineer in the river. Thick filamentous mats impede the movement of large invertebrates especially those that move and feed up on it and favor small, opportunistic, herbivorous organisms, mainly chironomids, that are capable of moving between filaments and are aided by the absence of large trophic competitors and predators -prey release effect-. Only small predators, such as hydra, are capable of surviving in the new environment, as they are favored by the increase in chironomids, a source of food, and by the reduction in both their own predators and other midge predators -mesopredator release-. This change in the top-down control affects the diatom community, since chironomids may feed on large diatoms, increasing the proportion of small diatoms in the substrate. The survival of small and fast-growing pioneer diatoms is also favored by the mesh of filaments, which offers them a new habitat for colonization. Simultaneously, D. geminata causes a significant reduction in the number of diatoms with similar ecological requirements (those attached to the substrate). Overall, D. geminata creates a community dominated by small organisms that is clearly different from the existing communities in the same stream where there is an absence of massive growths.Public Library of Science (PLoS)2018201820182018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion18 p.application/pdfhttps://hdl.handle.net/2445/121058Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1371/journal.pone.0193545PLoS One, 2018, vol. 3, num. 13, p. e0193545https://doi.org/10.1371/journal.pone.0193545cc-by (c) Ladrera, Rubén et al., 2018http://creativecommons.org/licenses/by/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1210582026-05-29T05:05:01Z
dc.title.none.fl_str_mv Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
title Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
spellingShingle Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
Ladrera, Rubén
Diatomees
Cursos d'aigua
Algues d'aigua dolça
Invasions biològiques
Diatoms
Rivers
Freshwater algae
Biological invasions
title_short Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
title_full Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
title_fullStr Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
title_full_unstemmed Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
title_sort Effects of Didymosphenia geminata massive growth on stream communities: Smaller organisms and simplified food web structure
dc.creator.none.fl_str_mv Ladrera, Rubén
Gomà Martínez, Joan
Prat i Fornells, Narcís
author Ladrera, Rubén
author_facet Ladrera, Rubén
Gomà Martínez, Joan
Prat i Fornells, Narcís
author_role author
author2 Gomà Martínez, Joan
Prat i Fornells, Narcís
author2_role author
author
dc.subject.none.fl_str_mv Diatomees
Cursos d'aigua
Algues d'aigua dolça
Invasions biològiques
Diatoms
Rivers
Freshwater algae
Biological invasions
topic Diatomees
Cursos d'aigua
Algues d'aigua dolça
Invasions biològiques
Diatoms
Rivers
Freshwater algae
Biological invasions
description This study aims to contribute to the understanding of the impact of Didymosphenia geminata massive growths upon river ecosystem communities' composition and functioning. This is the first study to jointly consider the taxonomic composition and functional structure of diatom and macroinvertebrate assemblages in order to determine changes in community structure, and the food web alterations associated with this invasive alga. This study was carried out in the Lumbreras River (Ebro Basin, La Rioja, Northern Spain), which has been affected by a considerable massive growth of D. geminata since 2011. The study shows a profound alteration in both the river community composition and in the food web structure at the sites affected by the massive growth, which is primarily due to the alteration of the environmental conditions, thus demonstrating that D. geminata has an important role as an ecosystem engineer in the river. Thick filamentous mats impede the movement of large invertebrates especially those that move and feed up on it and favor small, opportunistic, herbivorous organisms, mainly chironomids, that are capable of moving between filaments and are aided by the absence of large trophic competitors and predators -prey release effect-. Only small predators, such as hydra, are capable of surviving in the new environment, as they are favored by the increase in chironomids, a source of food, and by the reduction in both their own predators and other midge predators -mesopredator release-. This change in the top-down control affects the diatom community, since chironomids may feed on large diatoms, increasing the proportion of small diatoms in the substrate. The survival of small and fast-growing pioneer diatoms is also favored by the mesh of filaments, which offers them a new habitat for colonization. Simultaneously, D. geminata causes a significant reduction in the number of diatoms with similar ecological requirements (those attached to the substrate). Overall, D. geminata creates a community dominated by small organisms that is clearly different from the existing communities in the same stream where there is an absence of massive growths.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018
2018
2018
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://hdl.handle.net/2445/121058
url https://hdl.handle.net/2445/121058
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1371/journal.pone.0193545
PLoS One, 2018, vol. 3, num. 13, p. e0193545
https://doi.org/10.1371/journal.pone.0193545
dc.rights.none.fl_str_mv cc-by (c) Ladrera, Rubén et al., 2018
http://creativecommons.org/licenses/by/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by (c) Ladrera, Rubén et al., 2018
http://creativecommons.org/licenses/by/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 18 p.
application/pdf
dc.publisher.none.fl_str_mv Public Library of Science (PLoS)
publisher.none.fl_str_mv Public Library of Science (PLoS)
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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