Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000

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概要

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• 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.

• 国立極地研究所の論文

著者

• WRIGHT Simon

  Australian Antarctic Division, Channel Highway

• Davidson Andrew

  Australian Antarctic Division

• Marchant H

  Australian Antarctic Division

• Wright Simon

  Australianantarctic Division

• Wright Simon

  Australian Antarctic Division Channel Highway

• Ishikawa Akira

  Faculty of Bioresources, Mie University

• van den

  Australian Antarctic Division

• Marchant Harvey

  Australian Antarctic Division

• Davidson Andrew

  Australia Antarctic Division Channel High Way Kingston

• Ishikawa Akira

  Faculty Of Bioresources Mie University

関連論文

• ZOOPLANKTON COMMUNITY STRUCTURE OF PRYDZ BAY, ANTARCTICA, JANUARY-FEBRUARY 1993 (18th Symposium on Polar Biology)
• Abundance, size structure and community composition of phytoplankton in the Southern Ocean in the austral summer 1999/2000
• THE DISTRIBUTION AND ABUNDANCE OF CHROOCOCCOID CYANOBACTERIA IN THE SOUTHERN OCEAN (Ninth Symposium on Polar Biology)
• MARINE SNOW IN ANTARCTIC COASTAL WATERS (17th Symposium on Polar Biology)
• GRAZING RATE AND PARTICLE SIZE SELECTION BY THE CHOANOFLAGELLATE DIAPHANOECA GRANDIS FROM THE SEA-ICE OF LAGOON SAROMA KO, HOKKAIDO (Eleventh Symposium on Polar Biology)
• COMPARATIVE IMPACT OF IN SITU UV EXPOSURE ON PRODUCTIVITY, GROWTH AND SURVIVAL OF ANTARCTIC PHAEOCYSTIS AND DIATOMS (15th Symposium on Polar Biology)
• Life history stages of Pyramimonas tychotreta (Prasinophyceae, Chlorophyta), a marine flagellate from the Ross Sea, Antarctica
• MEASUREMENT OF ACRYLIC ACID AND DIMETHYL SULFIDE IN ANTARCTIC COASTAL WATER DURING A SUMMER BLOOM OF PHAEOCYSTIS POUCHETII (15th Symposium on Polar Biology)
• Variation in the diatom community under fast ice near Syowa Station, Antarctica, during the austral summer of 1997/98

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