Trophic interactions of the freshwater jellyfish Craspedacusta sowerbii |
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| Authors: | Jankowski Thomas; Strauss Tido; Ratte Hans Toni |
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| Institution: | Institute of Environmental Research (Biology V), Rwth Aachen University, Worringer Weg 1, D-52056 Aachen, Germany
 Present Address: Water Resources Department, Swiss Federaz Institute of Aquatic Science and Technology (EAWAG), Überlandstrasse 133, CH-8600 Dübendorf Switzerland
 Present Address: Research Institute for Ecosystem Analysis and Assessment – Gaiac, Rwth Aachen University, Worringer Weg 1, D-52056 Aachen, Germany |
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| Abstract: | The predatory impact and the trophic role of the freshwaterjellyfish, Craspedacusta sowerbii, was studied using microcosmand enclosure experiments as well as a 3-year pond survey. Theresults showed a significant decrease of small herbivorous crustaceans,i.e. Bosmina longirostris and juvenile cyclopoid copepods, inthe medusa treatments of the microcosms and the enclosure experiments.Chlorophyll concentrations in the enclosure experiment weresignificantly increased in the medusa treatment, suggestingthat C. sowerbii may cause cascading effects in the food chain.A comparison of daily zooplankton losses during the pond surveycaused by medusae and fish (roach, Rutilus rutilus), and theirfood selectivities suggest food separation of these two predatorsand reveal a strong negative impact of medusae on the copepodpond community. In the case of a jellyfish bloom, our resultsshow that both food chains can co-occur in lakes because ofa weak interaction between these top predators, fish and jellyfish,with simultaneous impacts on the zooplankton structure. |
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