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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 1 | PAGES 29-40 | 1990
© Oxford University Press

research-article

Diel periodicity and selectivity in the feeding rate of the predatory copepod Mesocyclops edax

L.Jane Schoeneck, Craig E. Williamson and Mark E. Stoeckel

Lehigh University, Department of Biology Bethlehem, PA 18015, USA

Received on August 16, 1988; accepted on September 7, 1989 The diel periodicity and selectivity in the feeding behavior of the predatory cyclopoid copepod Mesocyclops edax was investigated at 3 h intervals over two 24 h sampling periods in nature. Gut content analyses revealed an increase in gut fullness at 11.30 and 20.30 in July, and at 20.30 in August. The increase in gut fullness at these times could not be explained by an increase in prey density, changes in predator-prey overlap or differences in prey vulnerability. We suggest that M.edax exhibits a true diel periodicity in the intensity of its predatory activities, although the alternative hypothesis of a diel periodicity in gut passage time cannot be ruled out. Vanderploeg and Scavia's E* selectivity index indicated a preference for rotifer and cladoceran prey over copepods.


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