Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean

11 pages, 5 figures, 3 tables

Detalhes bibliográficos
Autores: Calbet, Albert, Landry, Michael R.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:1999
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/180929
Acesso em linha:http://hdl.handle.net/10261/180929
Access Level:Acceso aberto
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spelling Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-oceanCalbet, AlbertLandry, Michael R.11 pages, 5 figures, 3 tablesThe phytoplankton in warm oligotrophic regions of the open oceans is dominated by <2 μm cells too small for efficient direct consumption by mesozooplankton. However, these primary producers are hypothetically linked to higher trophic levels via the cascading impacts of mesozooplankton grazing on intermediate consumers. To assess the magnitudes of these indirect trophic linkages, grazing experiments, involving different concentration treatments of the mixed mesozooplankton community, were performed during cruises in the subtropical North Pacific at station ALOHA. Mesozooplankton fed on a diverse assemblage of microzooplankton and nanoheterotrophs <5 μm, and their predation indirectly enhanced net growth rates of phytoplankton and 2–5 μm heterotrophs. Increasing the concentration of mesozooplankton also enhanced growth rates of heterotrophic bacteria, but this was more likely the result of organic enrichment than trophic transfer. Scaled to their natural abundance, the indirect grazing impacts of mesozooplankton on lower trophic levels are small, accounting for <0.005 d‐1 of the growth rates of each prey category examined. Thus, the larger consumers appear to exert little net influence on the dynamics at the base of the food web. In contrast, size‐fraction manipulations of consumers between 2 and 20 μm (i.e., the nanozooplankton) elicited strong responses among bacterial populations indicative of tightly coupled predatory chain of at least two steps. Given the present results, detailed studies of the interactions among pico‐ and nanoplankton appear to be the most profitable avenue for improving our understanding of community structure and function in this region and for acquiring useful data for developing and validating ecosystem models of the open oceansPeer ReviewedAmerican Society of Limnology and OceanographyConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2019201919992019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/180929reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.4319/lo.1999.44.6.1370Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1809292026-05-22T06:33:51Z
dc.title.none.fl_str_mv Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
title Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
spellingShingle Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
Calbet, Albert
title_short Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
title_full Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
title_fullStr Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
title_full_unstemmed Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
title_sort Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open-ocean
dc.creator.none.fl_str_mv Calbet, Albert
Landry, Michael R.
author Calbet, Albert
author_facet Calbet, Albert
Landry, Michael R.
author_role author
author2 Landry, Michael R.
author2_role author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description 11 pages, 5 figures, 3 tables
publishDate 1999
dc.date.none.fl_str_mv 1999
2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/180929
url http://hdl.handle.net/10261/180929
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.4319/lo.1999.44.6.1370
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Society of Limnology and Oceanography
publisher.none.fl_str_mv American Society of Limnology and Oceanography
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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