Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs

Autores
Cefarelli, Adrián Oscar; Vernet, María; Ferrario, Martha Elba
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Free-drifting icebergs in the Weddell Sea are expected to affect the surrounding marine ecosystem.Sampling associated with iceberg C-18a, a large tabular, free-drifting iceberg in the NW Weddell Sea,carried out from 10 March to 7 April 2009, was designed to test the hypothesis that the iceberg?spresence modified phytoplankton composition and abundance. Areas that define a gradient of possibleiceberg influence were sampled for phytoplankton: stations close (o1 km) and far (18 km) fromiceberg C-18a, an area with numerous small icebergs, Iceberg Alley, and a control site 74 km away.Quantitative samples were obtained from Niskin bottles and counted with an inverted microscope forspecies abundance. Qualitative samples were collected with nets from the ship?s seawater intake.Taxonomic determinations were performed with light and electron microscopy. Overall, diatomsdominated in the mixed layer (surface-40 m) and unidentified small flagellated and coccid cells atdepth (100 m). Fragilariopsis nana, a diatom 2.4?15.5 mm in length, dominated numerically thephytoplankton and was most abundant at the control area. The iceberg?s effect on phytoplanktoncomposition was consistent with the hypothesis that they facilitate phytoplankton communitiesenriched in diatoms, as found in other productive areas of Antarctica. Near the iceberg, diatoms weremost abundant, principally at depth, while small flagellate concentration diminished. However, totalphytoplankton abundance was lowest at Iceberg Alley in the area of highest meltwater contribution, asindicated by low mean temperature in the mixed layer, and highest at the control site. These resultssuggest that during austral fall, low growth or high zooplankton grazing could be counteracting thepositive effect by icebergs on phytoplankton biomass, otherwise observed in summer months.
Fil: Cefarelli, Adrián Oscar. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Vernet, María. University of California at San Diego; Estados Unidos
Fil: Ferrario, Martha Elba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina
Materia
Antarctica
Iceberg
Meltwater
Phytoplankton
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/104495
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Phytoplankton composition and abundance in relation to free-floating Antarctic icebergsCefarelli, Adrián OscarVernet, MaríaFerrario, Martha ElbaAntarcticaIcebergMeltwaterPhytoplanktonhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Free-drifting icebergs in the Weddell Sea are expected to affect the surrounding marine ecosystem.Sampling associated with iceberg C-18a, a large tabular, free-drifting iceberg in the NW Weddell Sea,carried out from 10 March to 7 April 2009, was designed to test the hypothesis that the iceberg?spresence modified phytoplankton composition and abundance. Areas that define a gradient of possibleiceberg influence were sampled for phytoplankton: stations close (o1 km) and far (18 km) fromiceberg C-18a, an area with numerous small icebergs, Iceberg Alley, and a control site 74 km away.Quantitative samples were obtained from Niskin bottles and counted with an inverted microscope forspecies abundance. Qualitative samples were collected with nets from the ship?s seawater intake.Taxonomic determinations were performed with light and electron microscopy. Overall, diatomsdominated in the mixed layer (surface-40 m) and unidentified small flagellated and coccid cells atdepth (100 m). Fragilariopsis nana, a diatom 2.4?15.5 mm in length, dominated numerically thephytoplankton and was most abundant at the control area. The iceberg?s effect on phytoplanktoncomposition was consistent with the hypothesis that they facilitate phytoplankton communitiesenriched in diatoms, as found in other productive areas of Antarctica. Near the iceberg, diatoms weremost abundant, principally at depth, while small flagellate concentration diminished. However, totalphytoplankton abundance was lowest at Iceberg Alley in the area of highest meltwater contribution, asindicated by low mean temperature in the mixed layer, and highest at the control site. These resultssuggest that during austral fall, low growth or high zooplankton grazing could be counteracting thepositive effect by icebergs on phytoplankton biomass, otherwise observed in summer months.Fil: Cefarelli, Adrián Oscar. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Vernet, María. University of California at San Diego; Estados UnidosFil: Ferrario, Martha Elba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; ArgentinaPergamon-Elsevier Science Ltd2011-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/104495Cefarelli, Adrián Oscar; Vernet, María; Ferrario, Martha Elba; Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 58; 11-12; 6-2011; 1436-14500967-0645CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2010.11.023info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0967064510003887info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:37:32Zoai:ri.conicet.gov.ar:11336/104495instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:37:32.637CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
title Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
spellingShingle Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
Cefarelli, Adrián Oscar
Antarctica
Iceberg
Meltwater
Phytoplankton
title_short Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
title_full Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
title_fullStr Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
title_full_unstemmed Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
title_sort Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
dc.creator.none.fl_str_mv Cefarelli, Adrián Oscar
Vernet, María
Ferrario, Martha Elba
author Cefarelli, Adrián Oscar
author_facet Cefarelli, Adrián Oscar
Vernet, María
Ferrario, Martha Elba
author_role author
author2 Vernet, María
Ferrario, Martha Elba
author2_role author
author
dc.subject.none.fl_str_mv Antarctica
Iceberg
Meltwater
Phytoplankton
topic Antarctica
Iceberg
Meltwater
Phytoplankton
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Free-drifting icebergs in the Weddell Sea are expected to affect the surrounding marine ecosystem.Sampling associated with iceberg C-18a, a large tabular, free-drifting iceberg in the NW Weddell Sea,carried out from 10 March to 7 April 2009, was designed to test the hypothesis that the iceberg?spresence modified phytoplankton composition and abundance. Areas that define a gradient of possibleiceberg influence were sampled for phytoplankton: stations close (o1 km) and far (18 km) fromiceberg C-18a, an area with numerous small icebergs, Iceberg Alley, and a control site 74 km away.Quantitative samples were obtained from Niskin bottles and counted with an inverted microscope forspecies abundance. Qualitative samples were collected with nets from the ship?s seawater intake.Taxonomic determinations were performed with light and electron microscopy. Overall, diatomsdominated in the mixed layer (surface-40 m) and unidentified small flagellated and coccid cells atdepth (100 m). Fragilariopsis nana, a diatom 2.4?15.5 mm in length, dominated numerically thephytoplankton and was most abundant at the control area. The iceberg?s effect on phytoplanktoncomposition was consistent with the hypothesis that they facilitate phytoplankton communitiesenriched in diatoms, as found in other productive areas of Antarctica. Near the iceberg, diatoms weremost abundant, principally at depth, while small flagellate concentration diminished. However, totalphytoplankton abundance was lowest at Iceberg Alley in the area of highest meltwater contribution, asindicated by low mean temperature in the mixed layer, and highest at the control site. These resultssuggest that during austral fall, low growth or high zooplankton grazing could be counteracting thepositive effect by icebergs on phytoplankton biomass, otherwise observed in summer months.
Fil: Cefarelli, Adrián Oscar. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Vernet, María. University of California at San Diego; Estados Unidos
Fil: Ferrario, Martha Elba. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina
description Free-drifting icebergs in the Weddell Sea are expected to affect the surrounding marine ecosystem.Sampling associated with iceberg C-18a, a large tabular, free-drifting iceberg in the NW Weddell Sea,carried out from 10 March to 7 April 2009, was designed to test the hypothesis that the iceberg?spresence modified phytoplankton composition and abundance. Areas that define a gradient of possibleiceberg influence were sampled for phytoplankton: stations close (o1 km) and far (18 km) fromiceberg C-18a, an area with numerous small icebergs, Iceberg Alley, and a control site 74 km away.Quantitative samples were obtained from Niskin bottles and counted with an inverted microscope forspecies abundance. Qualitative samples were collected with nets from the ship?s seawater intake.Taxonomic determinations were performed with light and electron microscopy. Overall, diatomsdominated in the mixed layer (surface-40 m) and unidentified small flagellated and coccid cells atdepth (100 m). Fragilariopsis nana, a diatom 2.4?15.5 mm in length, dominated numerically thephytoplankton and was most abundant at the control area. The iceberg?s effect on phytoplanktoncomposition was consistent with the hypothesis that they facilitate phytoplankton communitiesenriched in diatoms, as found in other productive areas of Antarctica. Near the iceberg, diatoms weremost abundant, principally at depth, while small flagellate concentration diminished. However, totalphytoplankton abundance was lowest at Iceberg Alley in the area of highest meltwater contribution, asindicated by low mean temperature in the mixed layer, and highest at the control site. These resultssuggest that during austral fall, low growth or high zooplankton grazing could be counteracting thepositive effect by icebergs on phytoplankton biomass, otherwise observed in summer months.
publishDate 2011
dc.date.none.fl_str_mv 2011-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/104495
Cefarelli, Adrián Oscar; Vernet, María; Ferrario, Martha Elba; Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 58; 11-12; 6-2011; 1436-1450
0967-0645
CONICET Digital
CONICET
url http://hdl.handle.net/11336/104495
identifier_str_mv Cefarelli, Adrián Oscar; Vernet, María; Ferrario, Martha Elba; Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 58; 11-12; 6-2011; 1436-1450
0967-0645
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2010.11.023
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0967064510003887
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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