Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000
Abstract: 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 con...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.518.1542 2023-05-15T13:41:35+02:00 Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 Akira Ishikawal Simon W. Wright Rick Van Den Enden Andrew T. Davidson Harvey J. Marchant The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.1542 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.1542 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf text ftciteseerx 2016-01-08T09:57:49Z Abstract: 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 2-10 p m equivalent spherical diameter (ESD) commonly exceeded those < 2 p m ESD. No cells> I 0 p m ESD were detected by flow cytometry (however microscopy showed cells>10 p m in length). Throughout transect N, chlorophyll a concentrations were generally <0.5 p g I '. South of the Antarctic Polar Front (APF), chlorophyll a concentrations increased southward. CHEMTAX allocation of pigment data (italicized) showed that Diatoms contributed most chlorophyll with Haptophytes sub-dominant. North of the APF, chlorophyll a 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 a concentrations were also <0.5 jus I ' in most cases, but variable. Higher concentra-tions occasionally occurred in the west. In this transect, Diatoms contributed most (mean=61 * 15%) of the chlorophyll a, 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 a and diatom carbon biomass, particularly when chlorophyll and carbon concentrations were high. key words: phytoplankton, size structure, community composition, nanoplanktonic diatoms, Southern Ocean Text Antarc* Antarctic Southern Ocean Unknown Antarctic Austral Southern Ocean The Antarctic |
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ftciteseerx |
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English |
description |
Abstract: 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 2-10 p m equivalent spherical diameter (ESD) commonly exceeded those < 2 p m ESD. No cells> I 0 p m ESD were detected by flow cytometry (however microscopy showed cells>10 p m in length). Throughout transect N, chlorophyll a concentrations were generally <0.5 p g I '. South of the Antarctic Polar Front (APF), chlorophyll a concentrations increased southward. CHEMTAX allocation of pigment data (italicized) showed that Diatoms contributed most chlorophyll with Haptophytes sub-dominant. North of the APF, chlorophyll a 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 a concentrations were also <0.5 jus I ' in most cases, but variable. Higher concentra-tions occasionally occurred in the west. In this transect, Diatoms contributed most (mean=61 * 15%) of the chlorophyll a, 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 a and diatom carbon biomass, particularly when chlorophyll and carbon concentrations were high. key words: phytoplankton, size structure, community composition, nanoplanktonic diatoms, Southern Ocean |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Akira Ishikawal Simon W. Wright Rick Van Den Enden Andrew T. Davidson Harvey J. Marchant |
spellingShingle |
Akira Ishikawal Simon W. Wright Rick Van Den Enden Andrew T. Davidson Harvey J. Marchant Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
author_facet |
Akira Ishikawal Simon W. Wright Rick Van Den Enden Andrew T. Davidson Harvey J. Marchant |
author_sort |
Akira Ishikawal |
title |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
title_short |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
title_full |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
title_fullStr |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
title_full_unstemmed |
Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 199912000 |
title_sort |
abundance, size structure and community composition of phytoplankton in the southern ocean in the austral summer 199912000 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.1542 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.1542 http://polaris.nipr.ac.jp/~penguin/polarbiosci/issues/pdf/2002-Ishikawa.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766152594889113600 |