びわ湖湖水中におけるB群ビタミン濃度の日変動〔英文〕

概要

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Diurnal variations in the concentrations of B group vitamins in the water of southern Lake Biwa were studied by observations at intervals of 12hr. It was found that the concentrations of thiamine, biotin and vitamin B12 were generally high in the morning and low in the evening during the investigation period. Such diurnal rhythmical fluctuation was repeatedly observed unless there had been a heavy rain. The amounts of particulate matter and chlorophyll a in seston of large and small sizes increased during the daytime and it was usually larger in the morning than in the evening. These data suggest that the diurnal rhythmical changes in the concentrations of B group vitamins in water are due to the balance between autochthonous productin of these vitamins mainly by microorganisms and the consumptin of them mainly by phytoplankton.
日本水産學會の論文