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• W2007453067 abstract "Results obtained with three methods for measuring feeding rhythms of copepods were different. Gut fluorescence showed clear day-night variation during 2 out of 3 cruises at the Oyster Ground in the North Sea. The species studied (Pseudocalanus, Temora, Centropages, Calanus) had highest gut fluorescence during the night in May and September, the larger species demonstrating the largest difference. Gut fluorescence was positively correlated with ambient chlorophyll concentrations. Gut clearance rate was not dependent on temperature but on gut fullness. Gut passage times at high gut fluorescence levels were ∼25 minutes, at low levels 2 hours. In grazing experiments with 14C labelled food, filtering rates declined after 5 to 15 minutes, presumably before the first defecation of radioactive material. Filtering rates in Temora were higher at night than by day during May and July, but not in Pseudocalanus and Calanus during September. No diurnal pattern of amylase and tryptic activity was found, except in July for amylase but then probably due to vertical migration. The activity of these digestive enzymes appeared to be least and gut fluorescence most suitable for the detection of grazing rhythms. The occurrence of high fluorescence levels at night in all species studied suggests that intermittent feeding by copepods on phytoplankton is a general phenomenon from spring to autumn. The increase in foraging activity appeared to start well before complete darkness, during May and July even one hour or more before sunset." @default.
• W2007453067 created "2016-06-24" @default.
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• W2007453067 date "1984-11-01" @default.
• W2007453067 modified "2023-09-27" @default.
• W2007453067 title "Diurnal feeding rhythms in north sea copepods measured by Gut fluorescence, digestive enzyme activity and grazing on labelled food" @default.
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• W2007453067 doi "https://doi.org/10.1016/0077-7579(84)90027-9" @default.
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