Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000
The abundance, size structure and community composition of phytoplankton in the Southern Ocean were studied, using flow cytometry, microscopy and pigment profiles on two transects one latitudinal (N) and one longitudinal (W) during December 1999 and January 2000. In both transects, the concentration...
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Faculty of Bioresources, Mie University/AustralianAntarctic Division/Australian Antarctic Division/Australian Antarctic Division/Australian Antarctic Division
2002
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ftnipr:oai:nipr.repo.nii.ac.jp:00006180 2023-05-15T13:46:39+02:00 Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 Ishikawa,Akira Wright,Simon W. van den Enden, Rick Davidson,Andrew T. Marchant,Harvey J. 2002-02 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6180 http://id.nii.ac.jp/1291/00006180/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6180&item_no=1&attribute_id=18&file_no=1 en eng Faculty of Bioresources, Mie University/AustralianAntarctic Division/Australian Antarctic Division/Australian Antarctic Division/Australian Antarctic Division National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6180 http://id.nii.ac.jp/1291/00006180/ AA11327019 Polar bioscience, 15, 11-26(2002-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6180&item_no=1&attribute_id=18&file_no=1 phytoplankton size structure community composition nanoplanktonic diatoms Southern Ocean Departmental Bulletin Paper P(論文) 2002 ftnipr 2023-03-04T20:18:35Z The abundance, size structure and community composition of phytoplankton in the Southern Ocean were studied, using flow cytometry, microscopy and pigment profiles on two transects one latitudinal (N) and one longitudinal (W) during December 1999 and January 2000. In both transects, the concentration of autotrophic eukaryotes of 2-10μm equivalent spherical diameter (ESD) commonly exceeded those<2μm ESD. No cells>10μm ESD were detected by flow cytometry (however microscopy showed cells>10μm in length). Throughout transect N, chlorophyll α concentrations were generally<0.5μgι^<-1>. South of the Antarctic Polar Front (APF), chlorophyll α concentrations increased southward. CHEMTAX allocation of pigment data (italicized) showed that Diatoms contributed most chlorophyll with Haptophytes sub-dominant. North of the APF, chlorophyll α concentrations tended to increase northward. Here, Haptophytes contributed most chlorophyll, followed by Diatoms, Chlorophytes and Cyanobacteria, except at the northernmost stations where Cyanobacteria dominated. In transect W, chlorophyll α concentrations were also<0.5μgι^<-1> in most cases, but variable. Higher concentrations occasionally occurred in the west. In this transect, Diatoms contributed most (mean=61±15%) of the chlorophyll α, followed by Haptophytes. Nanodiatoms (particularly Fragilariopsis spp.) numerically dominated the diatom community. Fecal pellets composed of these nanodiatoms were observed in the Antarctic water, probably originating from heterotrophic dinoflagellates, implying a significant contribution of nanodiatoms to the microbial food web. However they contributed little to total chlorophyll α and diatom carbon biomass, particularly when chlorophyll and carbon concentrations were high. Report Antarc* Antarctic Polar bioscience Southern Ocean National Institute of Polar Research Repository, Japan Antarctic Austral Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
phytoplankton size structure community composition nanoplanktonic diatoms Southern Ocean |
spellingShingle |
phytoplankton size structure community composition nanoplanktonic diatoms Southern Ocean Ishikawa,Akira Wright,Simon W. van den Enden, Rick Davidson,Andrew T. Marchant,Harvey J. Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
topic_facet |
phytoplankton size structure community composition nanoplanktonic diatoms Southern Ocean |
description |
The abundance, size structure and community composition of phytoplankton in the Southern Ocean were studied, using flow cytometry, microscopy and pigment profiles on two transects one latitudinal (N) and one longitudinal (W) during December 1999 and January 2000. In both transects, the concentration of autotrophic eukaryotes of 2-10μm equivalent spherical diameter (ESD) commonly exceeded those<2μm ESD. No cells>10μm ESD were detected by flow cytometry (however microscopy showed cells>10μm in length). Throughout transect N, chlorophyll α concentrations were generally<0.5μgι^<-1>. South of the Antarctic Polar Front (APF), chlorophyll α concentrations increased southward. CHEMTAX allocation of pigment data (italicized) showed that Diatoms contributed most chlorophyll with Haptophytes sub-dominant. North of the APF, chlorophyll α concentrations tended to increase northward. Here, Haptophytes contributed most chlorophyll, followed by Diatoms, Chlorophytes and Cyanobacteria, except at the northernmost stations where Cyanobacteria dominated. In transect W, chlorophyll α concentrations were also<0.5μgι^<-1> in most cases, but variable. Higher concentrations occasionally occurred in the west. In this transect, Diatoms contributed most (mean=61±15%) of the chlorophyll α, followed by Haptophytes. Nanodiatoms (particularly Fragilariopsis spp.) numerically dominated the diatom community. Fecal pellets composed of these nanodiatoms were observed in the Antarctic water, probably originating from heterotrophic dinoflagellates, implying a significant contribution of nanodiatoms to the microbial food web. However they contributed little to total chlorophyll α and diatom carbon biomass, particularly when chlorophyll and carbon concentrations were high. |
format |
Report |
author |
Ishikawa,Akira Wright,Simon W. van den Enden, Rick Davidson,Andrew T. Marchant,Harvey J. |
author_facet |
Ishikawa,Akira Wright,Simon W. van den Enden, Rick Davidson,Andrew T. Marchant,Harvey J. |
author_sort |
Ishikawa,Akira |
title |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
title_short |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
title_full |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
title_fullStr |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
title_full_unstemmed |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000 |
title_sort |
abundance, size structure and community composition of phytoplankton in the southern ocean in the austral summer 1999/2000 |
publisher |
Faculty of Bioresources, Mie University/AustralianAntarctic Division/Australian Antarctic Division/Australian Antarctic Division/Australian Antarctic Division |
publishDate |
2002 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6180 http://id.nii.ac.jp/1291/00006180/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6180&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Polar bioscience Southern Ocean |
genre_facet |
Antarc* Antarctic Polar bioscience Southern Ocean |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=6180 http://id.nii.ac.jp/1291/00006180/ AA11327019 Polar bioscience, 15, 11-26(2002-02) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6180&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766245000428912640 |