Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea
peer reviewed The spatial and temporal distributions of phytoplankton pigments were investigated in the western and south central Ross Sea during austral spring 1994 and summer 1990. Large gradients in biomass and phytoplankton community composition were observed both in the east-west and south-nort...
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Elsevier Science
2000
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Online Access: | https://orbi.uliege.be/handle/2268/19659 https://orbi.uliege.be/bitstream/2268/19659/1/Goffart%20%20et%20al.%20JMS%202000.pdf https://doi.org/10.1016/S0924-7963(00)00065-8 |
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ftorbi:oai:orbi.ulg.ac.be:2268/19659 2024-04-21T07:46:42+00:00 Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea Goffart, Anne Catalano, Guilio Hecq, Jean-Henri MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège 2000 https://orbi.uliege.be/handle/2268/19659 https://orbi.uliege.be/bitstream/2268/19659/1/Goffart%20%20et%20al.%20JMS%202000.pdf https://doi.org/10.1016/S0924-7963(00)00065-8 en eng Elsevier Science urn:issn:0924-7963 https://orbi.uliege.be/handle/2268/19659 info:hdl:2268/19659 https://orbi.uliege.be/bitstream/2268/19659/1/Goffart%20%20et%20al.%20JMS%202000.pdf doi:10.1016/S0924-7963(00)00065-8 scopus-id:2-s2.0-0033667744 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Journal of Marine Systems, 27, 161-175 (2000) Antarctica Ross Sea Phytoplankton Diatoms Phaeocystis stratification Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2000 ftorbi https://doi.org/10.1016/S0924-7963(00)00065-8 2024-03-27T14:55:55Z peer reviewed The spatial and temporal distributions of phytoplankton pigments were investigated in the western and south central Ross Sea during austral spring 1994 and summer 1990. Large gradients in biomass and phytoplankton community composition were observed both in the east-west and south-north directions, in relation to differences in water column structure and stability, which themselves depend on the processes of ice retreat within the different areas. Important are melting in the western Ross Sea, which induces strong stratification, and ice breakup and wind stress in the south central Ross Sea, which result in deep mixing and weakly stratified waters. In the western Ross Sea, the highest chl a concentrations observed in this study (129 - 358 mg m-2 in the upper 100 m) were tightly coupled to the stratified region of meltwater influence and were dominated by diatoms, as indicated by elevated fucoxanthin concentrations (89 - 239 mg m-2 in the upper 100 m). In the diatom bloom area, high levels of phaeophorbides a (maximum value of 192 mg . m-2 in the upper 100 m) indicated that the dominant grazers, identified as Limacina helecina and copepods (Hecq et al., 1992), transferred a sustained part of the diatom production to the herbivore trophic level. Synthesis of our data with published information suggests that the diatom bloom we observed in the western Ross Sea was dominated by the species Fragilariopsis curta, and occurs annually off the coast of Victoria Land from 72°30'S to 77°S within 100 to 250 km from the coastal ice edge. It is assumed to persist on the order of 2.5 - 3 months during summer. In the south central Ross Sea, which was characterized by a poorly or unstratified water column, moderate chl a concentrations (55 - 186 mg m-2 in the upper 100 m) were found in the polynya and in the ice edge area in early spring. 19'-hexanoyloxyfucoxanthin, a biomarker for Phaeocystis, was the major contributor to the total carotenoid abundance (29 - 132 mg m-2 in the upper 100 m), corroborating the ... Article in Journal/Newspaper Antarc* Antarctica Ross Sea Victoria Land Copepods University of Liège: ORBi (Open Repository and Bibliography) Journal of Marine Systems 27 1-3 161 175 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Antarctica Ross Sea Phytoplankton Diatoms Phaeocystis stratification Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
spellingShingle |
Antarctica Ross Sea Phytoplankton Diatoms Phaeocystis stratification Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie Goffart, Anne Catalano, Guilio Hecq, Jean-Henri Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
topic_facet |
Antarctica Ross Sea Phytoplankton Diatoms Phaeocystis stratification Life sciences Aquatic sciences & oceanology Sciences du vivant Sciences aquatiques & océanologie |
description |
peer reviewed The spatial and temporal distributions of phytoplankton pigments were investigated in the western and south central Ross Sea during austral spring 1994 and summer 1990. Large gradients in biomass and phytoplankton community composition were observed both in the east-west and south-north directions, in relation to differences in water column structure and stability, which themselves depend on the processes of ice retreat within the different areas. Important are melting in the western Ross Sea, which induces strong stratification, and ice breakup and wind stress in the south central Ross Sea, which result in deep mixing and weakly stratified waters. In the western Ross Sea, the highest chl a concentrations observed in this study (129 - 358 mg m-2 in the upper 100 m) were tightly coupled to the stratified region of meltwater influence and were dominated by diatoms, as indicated by elevated fucoxanthin concentrations (89 - 239 mg m-2 in the upper 100 m). In the diatom bloom area, high levels of phaeophorbides a (maximum value of 192 mg . m-2 in the upper 100 m) indicated that the dominant grazers, identified as Limacina helecina and copepods (Hecq et al., 1992), transferred a sustained part of the diatom production to the herbivore trophic level. Synthesis of our data with published information suggests that the diatom bloom we observed in the western Ross Sea was dominated by the species Fragilariopsis curta, and occurs annually off the coast of Victoria Land from 72°30'S to 77°S within 100 to 250 km from the coastal ice edge. It is assumed to persist on the order of 2.5 - 3 months during summer. In the south central Ross Sea, which was characterized by a poorly or unstratified water column, moderate chl a concentrations (55 - 186 mg m-2 in the upper 100 m) were found in the polynya and in the ice edge area in early spring. 19'-hexanoyloxyfucoxanthin, a biomarker for Phaeocystis, was the major contributor to the total carotenoid abundance (29 - 132 mg m-2 in the upper 100 m), corroborating the ... |
author2 |
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège |
format |
Article in Journal/Newspaper |
author |
Goffart, Anne Catalano, Guilio Hecq, Jean-Henri |
author_facet |
Goffart, Anne Catalano, Guilio Hecq, Jean-Henri |
author_sort |
Goffart, Anne |
title |
Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
title_short |
Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
title_full |
Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
title_fullStr |
Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
title_full_unstemmed |
Factors controlling the distribution of diatoms and Phaeocystis in the Ross Sea |
title_sort |
factors controlling the distribution of diatoms and phaeocystis in the ross sea |
publisher |
Elsevier Science |
publishDate |
2000 |
url |
https://orbi.uliege.be/handle/2268/19659 https://orbi.uliege.be/bitstream/2268/19659/1/Goffart%20%20et%20al.%20JMS%202000.pdf https://doi.org/10.1016/S0924-7963(00)00065-8 |
genre |
Antarc* Antarctica Ross Sea Victoria Land Copepods |
genre_facet |
Antarc* Antarctica Ross Sea Victoria Land Copepods |
op_source |
Journal of Marine Systems, 27, 161-175 (2000) |
op_relation |
urn:issn:0924-7963 https://orbi.uliege.be/handle/2268/19659 info:hdl:2268/19659 https://orbi.uliege.be/bitstream/2268/19659/1/Goffart%20%20et%20al.%20JMS%202000.pdf doi:10.1016/S0924-7963(00)00065-8 scopus-id:2-s2.0-0033667744 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/S0924-7963(00)00065-8 |
container_title |
Journal of Marine Systems |
container_volume |
27 |
container_issue |
1-3 |
container_start_page |
161 |
op_container_end_page |
175 |
_version_ |
1796944272858021888 |