Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84
During the SIBEX I cruise of the R. V. KAIYO MARU of the Fisheries Agency in the 1983/84 season, zooplankton samplings were conducted in the Prydz Bay region in the Indian Ocean sector of the Antarctic Ocean. The sampling scheme consisted of two legs, i.e. December 4-24,1983 (Leg I) and January 19-F...
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Faculty of Fisheries, Hokkaido University/Faculty of Fisheries, Hokkaido University
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00002034 2023-05-15T13:47:59+02:00 Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 Satoshi Yamada Akito Kawamura 1986-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2034 http://id.nii.ac.jp/1291/00002034/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2034&item_no=1&attribute_id=18&file_no=1 en eng Faculty of Fisheries, Hokkaido University/Faculty of Fisheries, Hokkaido University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2034 http://id.nii.ac.jp/1291/00002034/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 44, 86-95(1986-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2034&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:52Z During the SIBEX I cruise of the R. V. KAIYO MARU of the Fisheries Agency in the 1983/84 season, zooplankton samplings were conducted in the Prydz Bay region in the Indian Ocean sector of the Antarctic Ocean. The sampling scheme consisted of two legs, i.e. December 4-24,1983 (Leg I) and January 19-February 2,1984 (Leg II), and a total of 63 stations were occupied. At the six stations between 62° and 64°S, zooplankton samplings were repeated in both December and January. The vertical hauls with a WP-2 net were made at all stations usually from 100m to the surface and from 500m to the surface. In the catches of 100-0m layer in December, it was shown that the abundance of the total zooplankton in terms of both individual number and wet weight per m^2 was larger in the Subantarctic and the Antarctic Convergence regions where chl. a was remarkably high. This high abundance is mainly due to the ontogenetic migration of the major copepod species from deeper layers. In January, both zooplankton abundance and chl. a were more abundant at the southernmost station (Stn. 194,69°S), which was probably due to the anomalous hydrographic situation of Prydz Bay by earlier ice melt. The zooplankton at this station was represented by the major large-sized copepods (Calanoides acutus, Calanus propinquus and Metridia gerlachei) of the more advanced developmental stages. The individual number and wet weight of total zooplankton in Januray at the repeated sampling stations became 64.5 and 38.8% of those in December, respectively, and this accompanied a decrease in all taxonomic groups. In Copepoda occupying more than 60% of the total zooplankton abundance throughout this investigation, there was observed a distinct decrease in their wet weight in January showing 35.1% of the weight in December while the individual number showed a little decrease during the same period. This was due to a large decrease in the abundance of the copepodite IV-VI stages of the major large-sized copepods, especially, C. acutus and Rhincalanus gigas. On the ... Report Antarc* Antarctic Antarctic Ocean Memoirs of National Institute of Polar Research Polar Research Prydz Bay Copepods National Institute of Polar Research Repository, Japan Antarctic Antarctic Ocean Indian Prydz Bay The Antarctic |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
During the SIBEX I cruise of the R. V. KAIYO MARU of the Fisheries Agency in the 1983/84 season, zooplankton samplings were conducted in the Prydz Bay region in the Indian Ocean sector of the Antarctic Ocean. The sampling scheme consisted of two legs, i.e. December 4-24,1983 (Leg I) and January 19-February 2,1984 (Leg II), and a total of 63 stations were occupied. At the six stations between 62° and 64°S, zooplankton samplings were repeated in both December and January. The vertical hauls with a WP-2 net were made at all stations usually from 100m to the surface and from 500m to the surface. In the catches of 100-0m layer in December, it was shown that the abundance of the total zooplankton in terms of both individual number and wet weight per m^2 was larger in the Subantarctic and the Antarctic Convergence regions where chl. a was remarkably high. This high abundance is mainly due to the ontogenetic migration of the major copepod species from deeper layers. In January, both zooplankton abundance and chl. a were more abundant at the southernmost station (Stn. 194,69°S), which was probably due to the anomalous hydrographic situation of Prydz Bay by earlier ice melt. The zooplankton at this station was represented by the major large-sized copepods (Calanoides acutus, Calanus propinquus and Metridia gerlachei) of the more advanced developmental stages. The individual number and wet weight of total zooplankton in Januray at the repeated sampling stations became 64.5 and 38.8% of those in December, respectively, and this accompanied a decrease in all taxonomic groups. In Copepoda occupying more than 60% of the total zooplankton abundance throughout this investigation, there was observed a distinct decrease in their wet weight in January showing 35.1% of the weight in December while the individual number showed a little decrease during the same period. This was due to a large decrease in the abundance of the copepodite IV-VI stages of the major large-sized copepods, especially, C. acutus and Rhincalanus gigas. On the ... |
format |
Report |
author |
Satoshi Yamada Akito Kawamura |
spellingShingle |
Satoshi Yamada Akito Kawamura Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
author_facet |
Satoshi Yamada Akito Kawamura |
author_sort |
Satoshi Yamada |
title |
Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
title_short |
Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
title_full |
Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
title_fullStr |
Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
title_full_unstemmed |
Some characteristics of the zooplankton distribution in the Prydz Bay region of the Indian sector of the Antarctic Ocean in the summer of 1983/84 |
title_sort |
some characteristics of the zooplankton distribution in the prydz bay region of the indian sector of the antarctic ocean in the summer of 1983/84 |
publisher |
Faculty of Fisheries, Hokkaido University/Faculty of Fisheries, Hokkaido University |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2034 http://id.nii.ac.jp/1291/00002034/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2034&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic Antarctic Ocean Indian Prydz Bay The Antarctic |
geographic_facet |
Antarctic Antarctic Ocean Indian Prydz Bay The Antarctic |
genre |
Antarc* Antarctic Antarctic Ocean Memoirs of National Institute of Polar Research Polar Research Prydz Bay Copepods |
genre_facet |
Antarc* Antarctic Antarctic Ocean Memoirs of National Institute of Polar Research Polar Research Prydz Bay Copepods |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2034 http://id.nii.ac.jp/1291/00002034/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 44, 86-95(1986-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2034&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248338738380800 |