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Co-existence of a pair of pelagic planktivorous coregonid fishes

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56716

Harrod,  Chris
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;
Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

Helland, I. P., Harrod, C., Freyhof, J., & Mehner, T. (2008). Co-existence of a pair of pelagic planktivorous coregonid fishes. Evolutionary Ecology Research, 10(3), 373-390.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-D6DC-2
Zusammenfassung
Hypothesis: Ecological specialization facilitates co-existence of Coregonus spp. in Lake Stechlin. A difference in trophic ecology is the dominant means by which the species are ecologically segregated. Background: Sympatric fish species pairs in post-glacial lakes often feed on different resources, segregating available trophic resources. Organisms: Sympatric European winter-spawning Coregonus albula and the local endemic dwarf-sized spring-spawning Coregonus fontanae. Time and place: March-December 2005, Lake Stechlin, North Germany. Methods: By combining stomach content analyses and stable isotope analyses we compared consumption patterns of the two species at different depths over a 10-month period. Results: Stable isotope analyses and stomach content analyses both showed little trophic difference between the two species, but a significant effect of capture depth and body size on individual diet. Conclusions: The sympatric species pair in Lake Stechlin does not follow the expected pattern of niche segregation. Trophic divergence is not the dominant grounds for co-existence.