Some Aspects of Predation by Chaoborus Punctipennis (Diptera: Chaoboridae) on Crustacean Zooplankton
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Selective predation by Chaoborus punctipennis on crustacean zooplankton was investigated in both field and experimental situations. Crop contents of larvae taken in Gull Lake, Michigan, were analyzed and selection of copepods over Daphnids was found. Selection between Cyclopoid and Calnoid copepods was minimal. Experiments involved several standardized zooplankton assemblages of representatives of each of these three major prey types. Predation was measured by comparing prey losses in experimental bottles to any prey losses in control bottles. Again, copepods were selected over Daphnids, and little selection between the two copepod types was evident.