THE FEEDING BEHAVIOR AND RESPIRATION OF SOME MARINE PLANKTONIC CRUSTACEA

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Abstract
The relationship between dry weight and metabolism was examined at 4-8[degree] C for 12 species of marine planktonic Crustacea, largely from depths greater than 100 m. The exponential constant obtained, 0.65, was lower than most previous observations on Crustacea and may be related to the low temperature at which the experiments were run. With a single species, Artemia salina, size and metabolism were related by a coefficient of 0.67 at 5[degree] C and 0.93 at 13[degree] C. Examination of food habits in captivity was made for most animals whose respiration was measured. Animals found largely herbivorous included the copepods Calanus finmarchicus, C. hyperboreus, and Rhincalanus nasutus; non-herbivores were the copepods Paraeuchaeta norvegica, Euchirella rostrata, Bathycalanus sp., amphipods Euthemisto compressa, Hyperia galba, and some euphausids. Those zooplankters which seemed to be largely carnivorous in the laboratory had a significantly higher metabolic rate than the herbivores.

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