JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 8 | PAGES 945-959 | 1994
© Oxford University Press
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Autotrophic picoplankton in southern Lake Baikal: abundance, growth and grazing mortality during summer
1National Institute for Environmental Studies Tsukuba, Ibaraki 305 2Department of Biology, Faculty of Science, Tokyo Metropolitan University Minami-Osawa, Hachioji, Tokyo 192-03, Japan 3Limnological Institute, Siberian Branch of Academy of Sciences Russia, Ulan-Botorskaya, Irkutsk, Russia 664033 4Department of Chemistry, Faculty of Science, Yamagata University Yamagata 990, Japan Institute for Hydrospheric-Atmospheric Sciences, Nagoya University Chikusa, Nagoya 464-01
Received on October 13, 1993; accepted on March 13, 1994 Autotrophic picoplankton were highly abundant during the thermal stratification period in late July in the pelagic area (water depth 500–1300 m) of southern Lake Baikal; maximum numbers were 2 x 106 cells ml–1 in the euphotic zone ({small tilde}15 m). Unicellular cyanobacteria generally dominated the picoplankton community, although unidentified picoplankton that fluoresced red under blue excitation were also abundant (maximum numbers 4 x 105 cells ml–1) and contributed up to {small tilde}40% of the total autotrophic picoplankton on occasions. Carbon and nitrogen biomasses of autotrophic picoplankton estimated by conversion from biovolumes were 14–84 µg C l–1 and 3.6–21 µg N l–1. These were comparable to or exceeded the biomass of heterotrophic bacteria. Autotropic picoplankton and bacteria accounted for as much as 33% of paniculate organic carbon and 81% of nitrogen in the euphotic zone. Measurements of the photosynthetic uptake of [l4C]bicarbonate and the growth of picoplankton in diluted or size-fractionated waters revealed that 80% of total primary production was due to picoplankton, and that much of this production was consumed by grazers in the <20 µ.m cell-size category. These results suggest that picoplankton-protozoan trophic coupling is important in the pelagic food web and biogeochemical cycling of Lake Baikal during summer.
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