Abstract
We examined the effects of fish on lower trophic levels in a small pond in eastern Finland. The pond was divided into four sections with plastic curtains and stocked with crucian carp (Carassius carassius)\ two sections had low (4.4–5.5 gm-3) and two high (10.4–13.7 g m-3) densities offish. In the summer of 1987, the pond was sampled weekly for phyto- and Zooplankton until the fish were removed by ro-tenone in September after a three month experiment. Fish density as well as the extent of macrophyte cover had a considerable impact on planktonic communities and water quality. Mean Zooplankton biomass was significantly lower and phytoplankton biomass higher, at high fish density. Water transparency was correlated negatively with chlorophyll- a at low fish density but turbidity appeared to reduce transparency at high fish density. The composition and dynamics of the plankton also differed at different fish densities. The mechanisms behind these effects, and the influences of habitat and fish behaviour on the results, are discussed.
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Holopainen, I.J., Tonn, W.M., Paszkowski, C.A. (1992). Effects of fish density on planktonic communities and water quality in a manipulated forest pond. In: Ilmavirta, V., Jones, R.I. (eds) The Dynamics and Use of Lacustrine Ecosystems. Developments in Hydrobiology, vol 79. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2745-5_32
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DOI: https://doi.org/10.1007/978-94-011-2745-5_32
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