The field data from four humic lakes suggested that water colour may have both direct and indirect effects on inter- and intra-specific interactions of perch Perca fluviatilis and roach Rutilus rutilus. The results agree with suggestions that, compared with R. rutilus, P. fluviatilis may be an inferior forager on zooplankton in highly coloured water. As an indirect effect, water colour decreases the coverage of macrophytes and limits suitable littoral habitats, benefiting R. rutilus over P. fluviatilis. Perca fluviatilis benefiting from complex habitats does not have the advantage in macrophyte-poor highly coloured water.
No Supplementary Data
Document Type: Regular Paper
Department of Biological and Environmental Sciences/Aquatic Sciences, P. O. Box 65, FIN-00014 University of Helsinki, Finland
Finnish Game and Fisheries Research Institute, Evo Fisheries Research Station, Rahtijärventie 291, FIN-16970 Evo, Finland
Publication date: 2010-07-01