CS06 Benthos
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
Gohse-ReimannS, Christian-Albrechts-Universitšt , Kiel, Germany, sgohse@zoologie.uni-kiel.de
 
FOOD, FEEDING AND PERFORMANCE OF TWO DECAPOD CRUSTACEANS
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The role of decapod crustaceans in aquatic foodwebs was examined by compairing marine and freshwater macrophyte systems. The investigations were focused on Carcinus maenas (L.) in the seagrass (Zostera marina) communities of the Kiel Bight (western Baltic Sea) and Orconectes limosus Raf. in Potamogeton perfoliatus communities in the „Schluensee“ (Holsteinische Seenplatte). In field studies the seasonal occurrence of both decapod species and their potential food resources were investigated. To determine the role of animal (small molluscs) and vegetable (macrophyte) food in C. maenas and O. limosus diets and feeding preferences were examined in relation to seasonal differences. Data suggest that C. maenas prefers carnivore food whereas O. limosus prefers herbivore food. But both decapod species showed an optimal growth rate (measured as wet weight) by consuming mixed (mollusc and macrophyte) food as compared to pure herbivore or pure carnivore diets.