Temporal and spatial variation of the phytoplankton assemblage in the eastern Indian sector of the Southern Ocean in summer 2001/2002 |
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Authors: | Yasushi Gomi Akira Taniguchi Mitsuo Fukuchi |
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Institution: | (1) National Institute of Polar Research, 1-9-10 Kaga, Itabashi-ku, Tokyo 173-8515, Japan;(2) Faculty of Bio-Industry, Tokyo University of Agriculture, 196 Yasaka, Abashiri, Hokkaido, 099-2493, Japan |
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Abstract: | The abundance and species composition of phytoplankton were investigated at stations in a permanently ice-free (61°S) and
seasonally ice-covered area (64°S and 66°30′S) in the eastern Indian sector of the Southern Ocean between November 2001 and
March 2002. Although a phytoplankton bloom occurred just after retreat of the sea ice at both stations in the seasonally ice-covered
area, vertical stability of the water column during the bloom was weak at the most southerly station. This shows that a bloom
can form even under weak vertical stability. In the bloom, diatoms dominated under weak vertical stability and Phaeocystis under strong vertical stability. In the latter case, ice algae largely contributed to development of the bloom. In the later
observation period, a subsurface chlorophyll maximum (SCM) was observed at 61°S and 64°S. Species composition was different
between the mixed layer and SCM at 64°S, but was uniform with depth at 61°S, indicating that the SCM is formed by different
mechanisms. |
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Keywords: | |
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