Effects of phytoplankton-induced turbidity on predation success of piscivorous Eurasian perch (Perca fluviatilis): possible implications for fish community structure in lakes

Turbidity can strongly influence predation success of visually oriented fish, especially piscivores such as adult Eurasian perch (Perca fluviatilis). This purely carnivorous species usually becomes a facultative piscivore after two discrete food niche shifts. Perch biomass has been observed to decrease in lakes along the productivity gradient, and then be replaced by cyprinids in non-manipulated eutrophic systems. Until now, this change has been mainly attributed to the competitive superiority of cyprinids for zooplankton prey during the juvenile phase of perch, while the piscivorous phase—as a possible factor influencing the recruitment success of perch—has been neglected. As the abundance of suitably sized prey fish should not be limiting in highly productive systems, we hypothesise that the switch from benthivorous feeding to preying on fish is inhibited by the reduced visibility in eutrophic lakes. We tested this hypothesis in laboratory experiments, where perch were fed two size classes of juvenile cyprinids at different phytoplankton- and bentonite-induced turbidity levels. Predation success was significantly influenced by turbidity level and turbidity source, but not by prey size. These experimental results suggest for the first time that piscivory of Eurasian perch is negatively influenced by different sources of turbidity, and hence low visibility might delay the onset of the food niche shift to fish prey.

[1]  S. Reid,et al.  Influence of turbidity on piscivory in largemouth bass (Micropterus salmoides) , 1999 .

[2]  T. Bonner,et al.  Effects of Turbidity on Prey Consumption by Prairie Stream Fishes , 2002 .

[3]  I. Cowx.  Rehabilitation of freshwater fisheries , 1994 .

[4]  S. Diehl,et al.  Density dependent interactions in lake ecosystems : whole lake perturbation experiments , 1993 .

[5]  G. R. Spangler,et al.  Effects of Eutrophication on Salmonid Communities in Oligotrophic Lakes , 1972 .

[6]  C. R. Braekevelt,et al.  Relationships between Turbidity, Piscivory, and Development of the Retina in Juvenile Walleyes , 1991 .

[7]  K. R. Allen.  The food and migration of the perch (Perca fluviatilis) in Windermere. , 1935 .

[8]  R. Eckmann,et al.  No General Percid Dominance under Mesotrophic Lake Conditions : A Test of Several Hypotheses , 2001 .

[9]  C. Levings,et al.  The effects of turbidity and vegetation on the risk of juvenile salmonids, Oncorhynchus spp., to predation by adult cutthroat trout, O. clarkii , 1996, Environmental Biology of Fishes.

[10]  J. Thorpe.  Morphology, Physiology, Behavior, and Ecology of Perca fluviatilis L. and P. flavescens Mitchill , 1977 .

[11]  L. Persson.  Food consumption and competition between age classes in a perch Perca fluviatilis population in a shallow eutrophic lake , 1983 .

[12]  L. Greenberg,et al.  Competition between a Planktivore, a Benthivore, and a Species with Ontogenetic Diet Shifts , 1994 .

[13]  Jürgen Benndorf,et al.  Possibilities and Limits for Controlling Eutrophication by Biomanipulation , 1995 .

[14]  E. Bergman.  Foraging abilities and niche breadths of two percids, Perca fluviatilis and Gymnocephalus cernua, under different environmental conditions , 1988 .

[15]  D. G. Smith,et al.  TURBIDITY SUSPENI)ED SEDIMENT, AND WATER CLARITY: A REVIEW 1 , 2001 .

[16]  M. Rask,et al.  Fish community structure in mesotrophic and eutrophic lakes of southern Finland: the relative abundances of percids and cyprinids along a trophic gradient , 2002 .

[17]  Lennart Persson,et al.  SHIFTS IN FISH COMMUNITIES ALONG THE PRODUCTIVITY GRADIENT OF TEMPERATE LAKES - PATTERNS AND THE IMPORTANCE OF SIZE-STRUCTURED INTERACTIONS , 1991 .

[18]  S. Diehl.  Foraging efficiency of three freshwater fishes: effects of structural complexity and light , 1988 .

[19]  E. Werner,et al.  THE ONTOGENETIC NICHE AND SPECIES INTERACTIONS IN SIZE-STRUCTURED POPULATIONS , 1984 .

[20]  M. Abrahams,et al.  The role of turbidity as a constraint on predator-prey interactions in aquatic environments , 1997, Behavioral Ecology and Sociobiology.

[21]  David A. Beauchamp,et al.  Effects of light, prey size, and turbidity on reaction distances of lake trout (Salvelinus namaycush) to salmonid prey , 1999 .

[22]  W. C. Leggett,et al.  Empirical Prediction of Fish Biomass and Yield , 1982 .

[23]  M. Scheffer.  Ecology of Shallow Lakes , 1997, Population and Community Biology Series.

[24]  P. A. Larkin,et al.  Factors Affecting Rainbow Trout (Salmo gairdneri) Predation on Migrant Fry of Sockeye Salmon (Oncorhynchus nerka) , 1976 .

[25]  J. Hartmann,et al.  Percids of Lake Constance, a Lake Undergoing Eutrophication , 1977 .