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  Phenotype-environment correlations in a putative whitefish adaptive radiation

Harrod, C., Mallela, J., & Kahilainen, K. K. (2010). Phenotype-environment correlations in a putative whitefish adaptive radiation. Journal of Animal Ecology, 79(5), 1057-1068. doi:10.1111/j.1365-2656.2010.01702.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D4F1-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D4F2-F
Genre: Journal Article

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 Creators:
Harrod, Chris1, 2, Author              
Mallela, Jennie1, Author              
Kahilainen, Kimmo K., Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              

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Free keywords: ecological speciation; ecomorphology; gill rakers; niche; stable isotope analysis
 Abstract: 1. The adaptive radiation of fishes into benthic (littoral) and pelagic (lentic) morphs in post-glacial lakes has become an important model system for speciation. Although these systems are well studied, there is little evidence of the existence of morphs that have diverged to utilize resources in the remaining principal lake habitat, the profundal zone. 2. Here, we tested phenotype-environment correlations of three whitefish (Coregonus lavaretus) morphs that have radiated into littoral, pelagic and profundal niches in northern Scandinavian lakes.We hypothesized that morphs in such trimorphic systems would have a morphology adapted to one of the principal lake habitats (littoral, pelagic or profundal niches). Most whitefish populations in the study area are formed by a single (monomorphic) whitefish morph, and we further hypothesized that these populations should display intermediate morphotypes and niche utilization. We used a combination of traditional (stomach content, habitat use, gill raker counts) and more recently developed (stable isotopes, geometric morphometrics) techniques to evaluate phenotype-environment correlations in two lakes with trimorphic and two lakes with monomorphic whitefish. 3. Distinct phenotype-environment correlations were evident for each principal niche in whitefish morphs inhabiting trimorphic lakes. Monomorphic whitefish exploited multiple habitats, had intermediate morphology, displayed increased variance in gillraker-counts, and relied significantly on zooplankton, most likely due to relaxed resource competition. 4. We suggest that the ecological processes acting in the trimorphic lakes are similar to each other, and are driving the adaptive evolution of whitefish morphs, possibly leading to the formation of new species.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Published in print
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 Identifiers: eDoc: 493173
DOI: 10.1111/j.1365-2656.2010.01702.x
Other: 2775/S 39113
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Title: Journal of Animal Ecology
Source Genre: Journal
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Pages: - Volume / Issue: 79 (5) Sequence Number: - Start / End Page: 1057 - 1068 Identifier: ISSN: 0021-8790 (print)
ISSN: 1365-2656 (online)