Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing

16 pages, 10 figures, 2 tables

Detalles Bibliográficos
Autores: Landry, Michael R., Constantinou, J., Latasa, Mikel, Brown, Susan L., Bidigare, Robert R., Ondrusek, Michael
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2000
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/184104
Acceso en línea:http://hdl.handle.net/10261/184104
Access Level:acceso abierto
Palabra clave:Marker pigments
Diatoms
Dinoflagellates
Ciliates
Grazing regulation
Iron-limitation
Production
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spelling Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazingLandry, Michael R.Constantinou, J.Latasa, MikelBrown, Susan L.Bidigare, Robert R.Ondrusek, MichaelMarker pigmentsDiatomsDinoflagellatesCiliatesGrazing regulationIron-limitationProduction16 pages, 10 figures, 2 tablesPhytoplankton growth and microzooplankton grazing were investigated during the IronEx II mesoscale enrichment experiment using the seawater dilution technique combined with group-specific pigment markers. Growth rate estimates for the phytoplankton community increased ≥ 2-fold, from 0.6 d-1 in the ambient environment to 1.2-1.6 d-1 in the iron-enhanced bloom. Grazing lagged growth, allowing phytoplankton biomass to accumulate at a high rate (~0.8 d-1) initially. However, grazing mortality ultimately increased 3- to 4-fold to 1.2-1.4 d-1, largely balancing growth by Day 6 of the experiment. Increased rates were broadly distributed among phytoplankton taxa, but they differed in timing. Whereas picophytoplankton showed more of a steady balance between growth and grazing, increasing grazing pressure on diatoms followed a 3-5-fold increase in larger (> 20 μm) heterotrophic dinoflagellates and ciliates, which grew in response to enhanced diatom biomass. In the ambient environment, phytoplankton production was 15 to 20 μg C l-1 d-1, with diatoms accounting for 17% of growth and 7% of grazing losses. Total phytoplankton production increased to 150-200 μg C l-1 d-1 at the peak of the patch bloom, where 79% of growth and 55% of microzooplankton grazing involved diatoms. Phytoplankton grazing mortality was significantly correlated with grazer biovolume, and high carbon-specific grazing estimates at the bloom peak indicated growth rates ~1.0 d-1 for the heterotrophic community and up to 1.4 d-1 for > 20 μm heterotrophs. During several days when high phytoplankton biomass was relatively constant in the patch bloom, the pennate diatom dominated the community and remained physiologically healthy and growing at a fast rate, even though nutrient conditions were suboptimal. Efficient cropping of diatoms by large protistan grazers and rapid remineralization of iron and biogenic silica were required to maintain this dynamic balance. Contrary to expectations, the carbon export ratio did not increase with the iron-induced diatom bloom. Thus, mesoscale iron-enrichment of high-nutrient, low chlorophyll waters in the eastern equatorial Pacific clearly demonstrated that phytoplankton growth rates and standing stocks were iron-limited. However, the food web also demonstrated a remarkable resiliency to environmental perturbation by establishing a new balance in which the essential features of a microzooplankton-dominated, low export system were maintainedPeer ReviewedInter ResearchConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2019201920002019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/184104reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.3354/meps201057Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1841042026-05-22T06:33:51Z
dc.title.none.fl_str_mv Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
title Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
spellingShingle Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
Landry, Michael R.
Marker pigments
Diatoms
Dinoflagellates
Ciliates
Grazing regulation
Iron-limitation
Production
title_short Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
title_full Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
title_fullStr Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
title_full_unstemmed Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
title_sort Biological response to iron fertilization in the eastern equatorial Pacific (IronEx II). III. Dynamics of phytoplankton growth and microzooplankton grazing
dc.creator.none.fl_str_mv Landry, Michael R.
Constantinou, J.
Latasa, Mikel
Brown, Susan L.
Bidigare, Robert R.
Ondrusek, Michael
author Landry, Michael R.
author_facet Landry, Michael R.
Constantinou, J.
Latasa, Mikel
Brown, Susan L.
Bidigare, Robert R.
Ondrusek, Michael
author_role author
author2 Constantinou, J.
Latasa, Mikel
Brown, Susan L.
Bidigare, Robert R.
Ondrusek, Michael
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Marker pigments
Diatoms
Dinoflagellates
Ciliates
Grazing regulation
Iron-limitation
Production
topic Marker pigments
Diatoms
Dinoflagellates
Ciliates
Grazing regulation
Iron-limitation
Production
description 16 pages, 10 figures, 2 tables
publishDate 2000
dc.date.none.fl_str_mv 2000
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/10261/184104
url http://hdl.handle.net/10261/184104
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.3354/meps201057
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Inter Research
publisher.none.fl_str_mv Inter Research
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 15,198674

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