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Effects of copepod foraging behavior on predation risk: An experimental study of the predatory copepod Pareuchaeta norvegica feeding on Acartia clausi and A-tonsa (Copepoda)

Journal article
Authors Peter Tiselius
Per R. Jonsson
S. Kaartvedt
M. E. Olsen
T. Jarstad
Published in Limnology and Oceanography
Volume 42
Issue 1
Pages 164-170
ISSN 0024-3590
Publication year 1997
Published at Department of Marine Ecology, Tjärnö Marine Biological Laboratory
Department of Marine Ecology
Pages 164-170
Language en
Links <Go to ISI>://A1997XK60100017
Keywords carnivorous marine copepod, selective predation, vertical migration, euchaeta-norvegica, calanoid copepods, prey detection, egg-production, 1st antennae, zooplankton, rates
Subject categories Biological Sciences, Ecology

Abstract

The effect of foraging behavior on predation risk was studied by exposing the two small calanoid copepods Acartia clausi and Acartia tonsa to 0 or 1 ppm (similar to 1,500 cells ml(-1)) of the diatom Thalassiosira weissflogii and to presence of the predator Pareuchaeta norvegica. In filtered water, predation rate was the same on the two species. In algal suspension, predation rate on A. clausi was half that in Filtered water and half that on A. tonsa. Video observations revealed distinct differences in motility of Acartia depending on algal concentration. Both species performed frequent short feeding bouts in algal suspension; nonfeeding copepods in filtered water alternately sank or adjusted their vertical distribution by stronger jumps. Jump frequency nearly doubled for A. clausi in filtered water. but no significant difference was observed for A. tonsa. To explain the predation, assuming that P. norvegica is a rheotactic predator, we developed a model of potential hydrodynamic disturbance associated with each foraging behavior. Increased encounter rate with P. norvegica caused by frequent strong jumps by A. clausi in the absence of algae could explain >40% of the observed increase in predation rate. For A. tonsa, jump frequencies and predation rates were similar in both food treatments, which is in accordance with the model.

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