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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2011
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| Acceso en línea: | 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 |
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paper:paper_09670645_v58_n1-2_p139_Olguin |
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dspace |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Biogeography Chlorophyll a Chlorophyll-a concentration Current system Diatoms Drake passage Environmental features Jaccard index Main group Oceanographic stations Plankton Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic and antarctic waters Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biodiversity Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance biogeography biomass chlorophyll a cluster analysis community composition diatom floristics ice cover nutrient availability phytoplankton polar front population distribution sea ice spatial analysis Subantarctic Intermediate Water water temperature Antarctic Peninsula Antarctica Argentine Shelf Atlantic Ocean Drake Passage Southern Ocean Weddell Sea West Antarctica Bacillariophyta Chaetoceros Fragilariopsis kerguelensis Porosira glacialis Thalassiosira |
| spellingShingle |
Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Biogeography Chlorophyll a Chlorophyll-a concentration Current system Diatoms Drake passage Environmental features Jaccard index Main group Oceanographic stations Plankton Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic and antarctic waters Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biodiversity Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance biogeography biomass chlorophyll a cluster analysis community composition diatom floristics ice cover nutrient availability phytoplankton polar front population distribution sea ice spatial analysis Subantarctic Intermediate Water water temperature Antarctic Peninsula Antarctica Argentine Shelf Atlantic Ocean Drake Passage Southern Ocean Weddell Sea West Antarctica Bacillariophyta Chaetoceros Fragilariopsis kerguelensis Porosira glacialis Thalassiosira 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 Biogeography Chlorophyll a Chlorophyll-a concentration Current system Diatoms Drake passage Environmental features Jaccard index Main group Oceanographic stations Plankton Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic and antarctic waters Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biodiversity Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance biogeography biomass chlorophyll a cluster analysis community composition diatom floristics ice cover nutrient availability phytoplankton polar front population distribution sea ice spatial analysis Subantarctic Intermediate Water water temperature Antarctic Peninsula Antarctica Argentine Shelf Atlantic Ocean Drake Passage Southern Ocean Weddell Sea West Antarctica Bacillariophyta Chaetoceros Fragilariopsis kerguelensis Porosira glacialis Thalassiosira |
| 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 different Antarctic islands. Such differences are attributed to the high relative density of Fragilariopsis kerguelensis in Argentine shelf and Drake Passage waters and of Porosira glacialis and species of Chaetoceros and Thalasiosira in the Weddell Sea and near the Antarctic Peninsula. From a total of 84 taxa recorded in antarctic waters, only 17 were found exclusively in this region, and the great majority (67) was also present in subantarctic waters but in extremely low (<1celll-1) concentrations, probably as a result of expatriation processes via the ACC-Malvinas Current system. The present results were compared with those of previous studies on the Antarctic region with respect to both diatom associations in regular vs. atypically warm years, and the distribution and abundance of some selected planktonic species reported for surface sediments. © 2010 Elsevier Ltd. |
| 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 http://hdl.handle.net/20.500.12110/paper_09670645_v58_n1-2_p139_Olguin |
| work_keys_str_mv |
AT olguinsalinashectorfernando speciescompositionandbiogeographyofdiatomsinantarcticandsubantarcticargentineshelfwaters3776s AT aldervivianaa speciescompositionandbiogeographyofdiatomsinantarcticandsubantarcticargentineshelfwaters3776s |
| _version_ |
1768546684541861888 |
| spelling |
paper:paper_09670645_v58_n1-2_p139_Olguin2023-06-08T15:58:44Z Species composition and biogeography of diatoms in antarctic and subantarctic (Argentine shelf) waters (37-76°S) Olguin Salinas, Héctor Fernando Alder, Viviana A. Biodiversity Biogeography Diatoms Plankton Subantarctic and antarctic waters Antarctic Peninsula Antarctic regions Austral summers Biogeography Chlorophyll a Chlorophyll-a concentration Current system Diatoms Drake passage Environmental features Jaccard index Main group Oceanographic stations Plankton Polar Front Relative density Similar numbers Spatial scale Species composition Species richness Study areas Subantarctic and antarctic waters Subantarctic waters Surface sediments Water temperatures Weddell Sea Anoxic sediments Biodiversity Biomass Cluster analysis Ocean habitats Phytoplankton Chlorophyll abundance biogeography biomass chlorophyll a cluster analysis community composition diatom floristics ice cover nutrient availability phytoplankton polar front population distribution sea ice spatial analysis Subantarctic Intermediate Water water temperature Antarctic Peninsula Antarctica Argentine Shelf Atlantic Ocean Drake Passage Southern Ocean Weddell Sea West Antarctica Bacillariophyta Chaetoceros Fragilariopsis kerguelensis Porosira glacialis Thalassiosira 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 different Antarctic islands. Such differences are attributed to the high relative density of Fragilariopsis kerguelensis in Argentine shelf and Drake Passage waters and of Porosira glacialis and species of Chaetoceros and Thalasiosira in the Weddell Sea and near the Antarctic Peninsula. From a total of 84 taxa recorded in antarctic waters, only 17 were found exclusively in this region, and the great majority (67) was also present in subantarctic waters but in extremely low (<1celll-1) concentrations, probably as a result of expatriation processes via the ACC-Malvinas Current system. The present results were compared with those of previous studies on the Antarctic region with respect to both diatom associations in regular vs. atypically warm years, and the distribution and abundance of some selected planktonic species reported for surface sediments. © 2010 Elsevier Ltd. Fil:Olguín, H.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:A. Alder, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 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 |