Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S)
A large spatial scale study of the diatom species inhabiting waters from the subantarctic (Argentine shelf) to antarctic was made for the first time in order to understand the relationships between these two regions with regard to the fluctuations in diatom abundances in relation with environmental...
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ftunibueairesbd:paper:paper_09670645_v58_n1-2_p139_Olguin 2023-05-15T13:51:25+02:00 Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) Olguin Salinas, Héctor Fernando Alder, Viviana A. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v58_n1-2_p139_Olguin https://hdl.handle.net/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v58_n1-2_p139_Olguin http://hdl.handle.net/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Chlorophyll a Chlorophyll-a concentration Current system Drake passage Environmental features Jaccard index Main group Oceanographic stations Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance community composition diatom floristics ice cover nutrient availability 2011 ftunibueairesbd https://doi.org/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin 2023-02-16T02:19:07Z A large spatial scale study of the diatom species inhabiting waters from the subantarctic (Argentine shelf) to antarctic was made for the first time in order to understand the relationships between these two regions with regard to the fluctuations in diatom abundances in relation with environmental features, their floristic associations and the effect of the Polar Front as a biogeographic barrier. Species-specific diatom abundance, nutrient and chlorophyll-a concentration were assessed from 64 subsurface oceanographic stations carried out during the austral summer 2002, a period characterized by an anomalous sea-ice coverage corresponding to a "warm year". Significant relationships of both diatom density and biomass with chlorophyll-a (positive) and water temperature (negative) were found for the study area as a whole. Within the Subantarctic region, diatom density and biomass values were more uniform and significantly (in average: 35 and 11 times) lower than those of the Antarctic region, and did not correlate with chlorophyll-a. In antarctic waters, instead, biomass was directly related with chlorophyll-a, thus confirming the important contribution of diatoms to the Antarctic phytoplanktonic stock. A total of 167 taxa were recorded for the entire study area, with Chaetoceros and Thalassiosira being the best represented genera. Species richness was maximum in subantarctic waters (46; Argentine shelf) and minimum in the Antarctic region (21; Antarctic Peninsula), and showed a significant decrease with latitude. Floristic associations were examined both qualitatively (Jaccard Index) and quantitatively (correlation) by cluster analyses and results allowed differentiating a similar number of associations (12 vs. 13, respectively) and two main groups of stations. In the Drake Passage, the former revealed that the main floristic change was found at the Polar Front, while the latter reflected the Southern ACC Front as a main boundary, and yielded a higher number of isolated sites, most of them located next to ... Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Drake Passage Sea ice Weddell Sea Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Antarctic Peninsula Argentine Austral Drake Passage The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Chlorophyll a Chlorophyll-a concentration Current system Drake passage Environmental features Jaccard index Main group Oceanographic stations Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance community composition diatom floristics ice cover nutrient availability |
spellingShingle |
Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Chlorophyll a Chlorophyll-a concentration Current system Drake passage Environmental features Jaccard index Main group Oceanographic stations Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance community composition diatom floristics ice cover nutrient availability Olguin Salinas, Héctor Fernando Alder, Viviana A. Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
topic_facet |
Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Chlorophyll a Chlorophyll-a concentration Current system Drake passage Environmental features Jaccard index Main group Oceanographic stations Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance community composition diatom floristics ice cover nutrient availability |
description |
A large spatial scale study of the diatom species inhabiting waters from the subantarctic (Argentine shelf) to antarctic was made for the first time in order to understand the relationships between these two regions with regard to the fluctuations in diatom abundances in relation with environmental features, their floristic associations and the effect of the Polar Front as a biogeographic barrier. Species-specific diatom abundance, nutrient and chlorophyll-a concentration were assessed from 64 subsurface oceanographic stations carried out during the austral summer 2002, a period characterized by an anomalous sea-ice coverage corresponding to a "warm year". Significant relationships of both diatom density and biomass with chlorophyll-a (positive) and water temperature (negative) were found for the study area as a whole. Within the Subantarctic region, diatom density and biomass values were more uniform and significantly (in average: 35 and 11 times) lower than those of the Antarctic region, and did not correlate with chlorophyll-a. In antarctic waters, instead, biomass was directly related with chlorophyll-a, thus confirming the important contribution of diatoms to the Antarctic phytoplanktonic stock. A total of 167 taxa were recorded for the entire study area, with Chaetoceros and Thalassiosira being the best represented genera. Species richness was maximum in subantarctic waters (46; Argentine shelf) and minimum in the Antarctic region (21; Antarctic Peninsula), and showed a significant decrease with latitude. Floristic associations were examined both qualitatively (Jaccard Index) and quantitatively (correlation) by cluster analyses and results allowed differentiating a similar number of associations (12 vs. 13, respectively) and two main groups of stations. In the Drake Passage, the former revealed that the main floristic change was found at the Polar Front, while the latter reflected the Southern ACC Front as a main boundary, and yielded a higher number of isolated sites, most of them located next to ... |
author |
Olguin Salinas, Héctor Fernando Alder, Viviana A. |
author_facet |
Olguin Salinas, Héctor Fernando Alder, Viviana A. |
author_sort |
Olguin Salinas, Héctor Fernando |
title |
Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
title_short |
Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
title_full |
Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
title_fullStr |
Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
title_full_unstemmed |
Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) |
title_sort |
species composition and biogeography of diatoms in antarctic and subantarctic (argentine shelf) waters (37-76°s) |
publishDate |
2011 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v58_n1-2_p139_Olguin https://hdl.handle.net/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin |
geographic |
Antarctic Antarctic Peninsula Argentine Austral Drake Passage The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Argentine Austral Drake Passage The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Sea ice Weddell Sea |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v58_n1-2_p139_Olguin http://hdl.handle.net/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin |
op_doi |
https://doi.org/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin |
_version_ |
1766255279975956480 |