Abstract
Gut-evacuation rates were compared for feeding and non-feeding Calanus marshallae collected near Yaquina Bay, Oregon (44°37′N; 124°04′W) from June 1986 through May 1987. Evacuation rates were measured at four concentrations of Thalassiosira weissflogii from the decline of gut-pigment fluorescence following transfer of copepods to filtered seawater and from the loss of cells labelled with 68-germanium, a radioactive analog of silicon. There was no significant difference between gut-evacuation rates of feeding and non-feeding copepods over both short-term (20 min) and long-term (90 min) evacuation times. Furthermore there was no difference between rates obtained using either pigment or 68Ge as tracers of gut food-passage. These results are discussed in the light of possible “dilution” of tracer in the guts of feeding copepods due to mixing with unlabelled food. Gut-evacuation rates measured at food concentrations ranging from 500 to 4000 cells ml-1 were not significantly different, regardless of the technique employed.
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Communicated by J. M. Pérès, Marseille
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Ellis, S.G., Small, L.F. Comparison of gut-evacuation rates of feeding and non-feeding Calanus marshallae . Mar. Biol. 103, 175–181 (1989). https://doi.org/10.1007/BF00543345
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DOI: https://doi.org/10.1007/BF00543345