Diurnal Change of ¹⁴C-Glucose Uptake by Epilimnetic Microbes in Lake Kizaki

Abstract

A pattern of diurnal change in microbial ¹⁴C-glucose uptake (net assimilation+mineralization) was observed in the epilimnion in Lake Kizaki, a typical mesotrophic lake. The highest uptake rate was found in the morning or noon and the rate decreased toward evening. During the nocturnal period the glucose uptake increased with time, and most of this increase was due to net assimilation.