Diet shifts and food selection of perch Perca fluviatilis and roach Rutilus rutilus in humic lakes of varying water colour

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 infer...

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Bibliographic Details
Published in:Journal of fish biology 2010-07, Vol.77 (1), p.241-256
Main Authors: Estlander, S., Nurminen, L., Olin, M., Vinni, M., Immonen, S., Rask, M., Ruuhijärvi, J., Horppila, J., Lehtonen, H.
Format: Article
Language:English
Subjects:
Animals
bottleneck
Color
competitive interactions
Cyprinidae - physiology
Diet
Ecosystem
Finland
Food Preferences
Fresh Water - analysis
Freshwater
niche shift
ontogeny
Perca fluviatilis
Perches - physiology
Predatory Behavior
Rutilus rutilus
water transparency
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Summary: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.
ISSN:0022-1112
1095-8649
DOI:10.1111/j.1095-8649.2010.02682.x