Importance of Photosynthetic Sulfur Bacteria, <I>Chromatium</I> sp. as an Organic Matter Producer in Lake Kaiike
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概要
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The purpose of the present paper is to show the importance of photosynthetic sulfur bacteria, <I>Chromatium</I> sp., as an organic matter producer in Lake Kaiike, a small lake situated on the north coast of Kamikoshiki Island. The lake (surface area : 0.15 km<SUP>2</SUP>, maximum depth : 11.6 m) waters are brackish above and very saline below. The deeper part of the saline water contains a remarkable amount of hydrogen sulfide. Water at the O<SUB>2</SUB>-H<SUB>2</SUB>S boundary contains a dense population of <I>Chromatium</I> sp. The bacteria concentration attains a maximum of 5.3 10<SUP>6</SUP> cells/m<I>l</I>, forming the so-called "bacterial plate." The carbon assimilation rate at the boundary reaches 30-80 % of the total one. A large number of zooplankton such as <I>Brachionus</I> sp. and <I>Tintinnopsis</I> sp. inhabit the water above the bacterial plate. <I>Chromatium</I> sp. appears to have an important role as a food source in supporting the high zooplankton biomass in Lake Kaiike.
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日本陸水学会 | 論文
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