Nutrient limitation of the primary production of phytoplankton in Lake Baikal |
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Authors: | Yasuhiro Satoh Toshiya Katano Takeshi Satoh Osamu Mitamura Kaori Anbutsu Shin-ichi Nakano Hiroyuki Ueno Masaki Kihira Valentin Drucker Yuji Tanaka Tetsuro Mimura Yasunori Watanabe Masahito Sugiyama |
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Institution: | (1) Faculty of Science, Yamagata University, Yamagata 990-8560, Japan;(2) CMES, Ehime University, Matsuyama, Japan;(3) School of Environmental Science, University of Shiga Prefecture, Hikone, Japan;(4) Limnological Institute, Siberian Branch, Russian Academy of Science, Irkutsk, Russia;(5) Department of Ocean Sciences, Tokyo University of Fisheries, Tokyo, Japan;(6) Faculty of Science, Nara Women’s University, Nara, Japan;(7) Department of Biology, Tokyo Metropolitan University, Tokyo, Japan;(8) Graduate School of Human Environmental Studies, Kyoto University, Kyoto, Japan |
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Abstract: | Nutrient limitation of the primary production of phytoplankton at some stations in southern and central Lake Baikal was studied
by nutrient enrichment experiments in August 2002. Chlorophyll (Chl.) a concentrations ranged from 0.7 to 5.8μgl−1. Inorganic nutrient concentrations were low: soluble reactive phosphorus ranged from 0.05 to 0.20μmoll−1, ammonia from 0.21 to 0.41μmoll−1, and nitrite plus nitrate from 0.33 to 0.37μmoll−1. In the five enrichment experiments, phosphate spikes and phosphate plus nitrate spikes always stimulated primary production.
Nitrate spikes also stimulated primary production in four of the experiments. Significant differences were detected between
the controls and phosphate spikes and between the controls and phosphate plus nitrate spikes. Thus, the first limiting nutrient
is thought to be phosphorus, but once phosphorus is supplied to the surface water, the limiting nutrient will quickly shift
from phosphorus to nitrogen. |
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Keywords: | Enrichment experiments Nitrate Phosphate Summer |
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