Chla-specific productivity of picophytoplankton not higher than that of larger phytoplankton off the South Shetland Islands in summer |
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| Authors: | A Shiomoto S Kawaguchi K Imai Y Tsuruga |
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| Institution: | (1) National Research Institute of Far Seas Fisheries, 7-1 Orido 5-chome, Shimizu-shi, Shizuoka, 424 Japan, JP;(2) Hokkaido University, 3-8-8, Minato-cho, Hakodate, Hokkaido, 041 Japan, JP;(3) Remote Sensing Technology Center of Japan Hayama Division, 1401 Numanoue Ohashi, Hatoyama-machi, Hiki-gun, Saitama, 350-03 Japan, JP |
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| Abstract: | Size-fractionated chlorophyll a (Chla)-specific productivity (μgC μgChla
−1 h−1) was measured at 11 stations off the northern coast of the South Shetland Islands during summer. The Chla-specific productivity of the 2- to 10 or 10- to 330-μm fraction was highest at 100% and 23% light depths. The Chla-specific productivity of the 2- to 10-μm fraction was generally highest, and that of the <2 or 10- to 330-μm fraction was
sometimes highest at 12% and 1% light depths. Temperature was less than 3°C within the euphotic zone at all stations. The
hypothesis of Shiomoto et al., according to which Chla-specific productivity of picophytoplankton (<2 μm) is not significantly higher than that of larger phytoplankton (>2 μm)
in water colder than 10°C, was supported on condition that light is not limited for larger phytoplankton.
Received: 16 September 1997 / Accepted: 8 December 1997 |
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