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- W2030788891 abstract "Summary 1. Density gradients of cladocerans and copepods were generated in an enclosure experiment to compare the impact on the plankton of a filter feeder ( Daphnia hyalina × galeata ) with that of more selective feeders (calanoid and cyclopoid copepods). The experiment was conducted in situ over 25 days during spring in a mesotrophic lake, Schöhsee, Germany. 2. The plankton community was monitored regularly. Daphniids were able to graze on the phytoplankton present, which mainly consisted of small (<1000 μ m 3 ) species, whereas copepods did not show any impact on algae. 3. At the end of the experiment, Daphnia and remaining cyclopoid copepods were harvested and sorted manually, prior to analyses for stable isotopes of carbon and nitrogen. Daphniids from mesocosms stocked purely with differing densities of Daphnia showed little variability in stable isotope values, whereas those that thrived in enclosure bags together with copepods exhibited lower δ 13 C values. 4. The change in Daphnia δ 13 C indicates a change of food sources, modified by the presence of the copepods: the higher the mean abundance of copepods in the enclosures, the more 13 C‐depleted the daphniids. Increasing abundance of high nucleic acid (HNA) bacteria in the copepod bags may account for the trend in Daphnia δ 13 C via increased grazing on the bacteria themselves, or via grazing on phytoplankton utilising isotopically light CO 2 from respiratory release. 5. Cyclopoid copepod stable isotope signatures were related to Daphnia and copepod abundances in copepod bags, suggesting that cyclopoids preyed on the available zooplankton." @default.
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- W2030788891 date "2004-10-04" @default.
- W2030788891 modified "2023-10-15" @default.
- W2030788891 title "Zooplankton interactions in an enclosure experiment: insights from stable isotope analyses" @default.
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- W2030788891 doi "https://doi.org/10.1111/j.1365-2427.2004.01283.x" @default.
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