Abstract
While the structuring role of fish in lakes is well studied for the summer season in North temperate lakes, little is known about their role in winter when fish activity and light irradiance potentially are lower. This is unfortunate as the progressing climate change may have strong effects on lake winter temperature and possibly on trophic dynamics too. We conducted an enclosure experiment with and without the presence of fish throughout winter in two shallow lakes with contrasting phosphorus concentrations. In hypertrophic Lake Søbygård, absence of fish led to higher biomass of zooplankton, higher grazing potential (zooplankton:phytoplankton ratio) and, accordingly, lower biomass of phytoplankton and chlorophyll a (Chl a), while the concentrations of total nitrogen (TN), total phosphorus (TP), oxygen and pH decreased. The average size of egg-bearing Daphnia and Bosmina and the minimum size of egg-bearing specimens of the two genera rose. In the less eutrophic Lake Stigsholm, zooplankton and their grazing potential were also markedly affected by fish. However, the decrease in Chl a was slight, and phytoplankton biovolume, pH and the oxygen concentration were not affected. TN was higher when fish were absent. Our results indicate that: (i) there is a notable effect of fish on zooplankton community structure and size during winter in both eutrophic and hypertrophic North temperate lakes, (ii) Chl a can be high in winter in such lakes, despite low light irradiance, if fish are abundant, and (iii) the cascading effects on phytoplankton and nutrients in winter may be more pronounced in hypertrophic lakes. Climate warming supposedly leading to reduced winter mortality and dominance of small fish may enhance the risk of turbid state conditions in nutrient-enriched shallow lakes, not only during the summer season, but also during winter.
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Acknowledgements
We wish to thank the owners of the lakes, Kirsten and Ove Henriksen (Stigsholm) and Wefri a/s Frijsenborg and Wedellsborg (Søbygård), for permission to set up the experiments. The technical staff at the National Environmental Research Institute, Silkeborg, is gratefully acknowledged for their assistance. We are also grateful to Anne Mette Poulsen for skilful editorial assistance. The study was supported by the projects EU WISER and EU REFRESH, CRES and CLEAR (a Villum Kann Rasmussen Centre of Excellence project).
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Sørensen, T., Mulderij, G., Søndergaard, M. et al. Winter ecology of shallow lakes: strongest effect of fish on water clarity at high nutrient levels. Hydrobiologia 664, 147–162 (2011). https://doi.org/10.1007/s10750-010-0595-y
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DOI: https://doi.org/10.1007/s10750-010-0595-y