The effects of planktivorous fish (golden shiners) on the ciliate community of a mesotrophic lake
| Autor: | Anke B. Müller-Solger, James J. Elser, Charles R. Goldman, Chris Luecke, Michael T. Brett |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Journal of Plankton Research. 19:1815-1828 |
| ISSN: | 1464-3774 0142-7873 |
| DOI: | 10.1093/plankt/19.12.1815 |
| Popis: | A whole-lake food web manipulation suggested that planktivorous fish can play an impor- tant role in regulating the pelagic food web structure of mesotrophic lakes. In this study, we exam- ined the impact of golden shiners (Notemigonus crysoleucas) on zooplankton, ciliates, phytoplankton and nutrients. We conducted a mesocosm experiment using treatments with and without golden shiners with three replicates per treatment in summer. We monitored plankton and nutrient dynam- ics in these mesocosms for 6 weeks. Total macrozooplankton biomass and the proportion of large crus- taceans decreased dramatically in the golden shiner treatment, while rotifer biomass decreased only in the second half of the experiment. In the mesocosms with golden shiners, total ciliate biovolume increased. However, the impact of golden shiners on ciliates was species specific. Chlorophyll a con- centrations increased and dissolved nutrients (inorganic nitrogen and phosphorus) were statistically unaffected in the golden shiner treatment. This experiment showed that golden shiners had a strong negative impact on macrozooplankton, a variable impact on rotifers, weak positive impacts on cili- ates and phytoplankton, and no discernible impact on dissolved inorganic nutrient concentrations. The results of this study help integrate aspects of previous research in mesotrophic lakes and provide evidence for cascading trophic interactions from fish to protozoans in a mesotrophic lake. |
| Databáze: | OpenAIRE |
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