Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs
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?spres...
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ftconicet:oai:ri.conicet.gov.ar:11336/104495 2023-10-09T21:47:13+02:00 Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs Cefarelli, Adrián Oscar Vernet, María Ferrario, Martha Elba application/pdf http://hdl.handle.net/11336/104495 eng eng Pergamon-Elsevier Science Ltd 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 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 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Antarctica Iceberg Meltwater Phytoplankton https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.dsr2.2010.11.023 2023-09-24T20:17:56Z 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 ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Iceberg* Weddell Sea CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Weddell Sea Austral Weddell Argentina Deep Sea Research Part II: Topical Studies in Oceanography 58 11-12 1436 1450 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Antarctica Iceberg Meltwater Phytoplankton https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Antarctica Iceberg Meltwater Phytoplankton https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Cefarelli, Adrián Oscar Vernet, María Ferrario, Martha Elba Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs |
topic_facet |
Antarctica Iceberg Meltwater Phytoplankton https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
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. 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 ... |
format |
Article in Journal/Newspaper |
author |
Cefarelli, Adrián Oscar Vernet, María Ferrario, Martha Elba |
author_facet |
Cefarelli, Adrián Oscar Vernet, María Ferrario, Martha Elba |
author_sort |
Cefarelli, Adrián Oscar |
title |
Phytoplankton composition and abundance in relation to free-floating Antarctic icebergs |
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 |
publisher |
Pergamon-Elsevier Science Ltd |
url |
http://hdl.handle.net/11336/104495 |
geographic |
Antarctic Weddell Sea Austral Weddell Argentina |
geographic_facet |
Antarctic Weddell Sea Austral Weddell Argentina |
genre |
Antarc* Antarctic Antarctica Iceberg* Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Iceberg* Weddell Sea |
op_relation |
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 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 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.dsr2.2010.11.023 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
58 |
container_issue |
11-12 |
container_start_page |
1436 |
op_container_end_page |
1450 |
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1779310160223666176 |