In situ feeding of the planktonic copepod Calanus sinicus in the Inland Sea of Japan, examined by the gut fluorescence method
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We investigated in situ feeding of adult females of the planktonic copepod Calanus sinicus in the Inland Sea of Japan by the gut fluorescence method. Unlike many empirical observations of food-dependent feeding in copepods, no correlation was found between in situ gut pigment of C. sinicus and ambient chlorophyll a concentration. This might partly be due to the large (up to 13-fold) variability in individual gut content, which persisted thrdughout the day. The C. sinicus population showed a diel feeding periodicity; mean gut pigment was significantly higher at night than during the day. Gut evacuation rate increased linearly with increasing temperature. Daily pigment ingestion rates were estimated at 3 stations where gut pigment data over 24 h were available. They varied from 209 to 842 ng pigment indiv.^<-1> d^<-1>. Assuming that the population biomass of C. sinicus at these stations was 32 mg C m^<-3> (the average biomass in Osaka Bay), the population would have consumed 13 to 85% of the phytoplankton standing crop per day.
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