児島湖におけるチアミン,ビオチン,およびビタミンB12の分布について-2-底土中の分布〔英文〕

概要

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In the previous report, concentrations of thiamine, biotin, and vitamin B12 in the water of Lake Kojima, a eutrophic lake, were shown to be fairly high. In the present paper, contents of these B group vitamins in the bottom sediments of Lake Kojima which were determined by microbiological assay methods are reported. Also the relations between vitamin contents and some chemical or biological environmental factors are described. Contents of the B group vitamins in the lake sediments were found to be also fairly high: thiamine 13.6-212.0ng/g, biotin 0-3.28ng/g, and vitamin B12 1.28-116.0ng/g, on the basis of wet sediment; these values were about 100-1000times as much as in the lake water. The contents of these vitamins in sediment cores generally decreased with increasing depth of the sediment. Contents of biotin and vitamin B12, but not thiamine, correlated positively with both IL and COD values. Contents of all these three vitamins correlated positively with the population of aerobic heterotrophic bacteria. It is suggested that each vitamin contained abundantly in the sediments of Lake Kojima may be an important source of that vitamin in the lake water and that these vitamins originate mainly through microbial processes. It is also suggested that anaerobic as well as aerobic processes may be involved in the accumulation of each vitamin in the sediments of the lake.
日本水産學會の論文