Primary production and community respiration in a warm streamer associated with Kuroshio warm core ring in spring |
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| Authors: | Mitsuyasu Waku Ken Furuya |
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| Institution: | (1) Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, University of Tokyo, Yayoi, Bunkyo, 113-8657 Tokyo, Japan;(2) Present address: Department of Agriculture and Fisheries, Aichi Prefectural Government, Naka, 460-8501 Nagoya, Aichi, Japan |
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| Abstract: | Daily rates of gross primary production, net community production and community respiration were determined in spring of 1997
at two stations in a warm streamer off Sanriku, Japan fromin vitro changes in dissolved oxygen. The phytoplankton community was composed of chlorophytes, cryptophytes and prymnesiophytes as
determined by biomarker pigment analysis. Gross production, integrated from the surface to its 1% light level was 52.5 and
80.4 mmol O2 m−2d−1. The difference in gross production is ascribed to variations in photosynthetic activity of the population. Community respiration
was 17.4 and 49.5 mmol O2 m−2d−1, and positive net community production was found within the euphotic zone. The contribution of autotrophic and heterotrophic
respiration to community respiration was estimated on the basis of the observed respiration and the phytoplankton composition.
Heterotrophic respiration was calculated to be highly variable and the observed difference in community respiration was due
to heterotrophic respiration. Heterotrophic respiration was considered to play an important role in the rapid mineralization
of organic materials. |
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| Keywords: | Primary production community respiration net community production warm streamer warm core ring subarctic Pacific Kuroshio |
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