Comparison of the roles of Ostracods and Cladocerans in regulating community structure and metabolism in freshwater microcosms |
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Authors: | Mary Pitts Diner Eugene P. Odum Paul F. Hendrix |
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Affiliation: | (1) Center for Interdisciplinary Studies, University of Colorado, 80309 Boulder, Colorado, USA;(2) Institute of Ecology, University of Georgia, 30602 Athens, Georgia, USA |
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Abstract: | Laboratory microcosms were used to compare the effects of the littoral ostracod Cypridopsis vidua and the planktonic cladoceran Daphnia magna on community structure and metabolism. Filter-feeding by cladocerans, both in the presence and absence of ostracods, greatly reduced the abundance of planktonic algae when D. magna reached peak density around day 50; rotifers and euglenids were then limited to flocculent matter on the container bottom. Both net production and community respiration rates decreased as community composition changed. Microcosms containing ostracods as the only microcrustacean showed little reduction in total algal numbers but the otherwise dominant alga, Scenedesmus spp., was replaced by Ankistrodesmus spp. when peak ostracod density was reached around day 100. Rotifers were completely eliminated but euglenids were able to coexist with ostracods. Ostracods impacted community metabolism less than cladocerans, but depressed respiration slightly more than net production. |
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Keywords: | algal grazing Daphnia magna Cypridopsis vidua oxygen metabolism |
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