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  The temporal window of ecological adaptation in postglacial lakes: a comparison of head morphology, trophic position and habitat use in Norwegian threespine stickleback populations

Ostbye, K., Harrod, C., Gregersen, F., Klepaker, T., Schulz, M., Schluter, D., et al. (2016). The temporal window of ecological adaptation in postglacial lakes: a comparison of head morphology, trophic position and habitat use in Norwegian threespine stickleback populations. BMC Evolutionary Biology, 16, 102. doi:10.1186/s12862-016-0676-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-7EB8-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-7EBB-2
Genre: Journal Article

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Funding This study was financially supported by the Research Council of Norway (grant no 170755/V20 to LAV). CH thanks Diethard Tautz, Winfried Lampert and the Max Planck Society for financial support.
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 Creators:
Ostbye, Kjartan, Author
Harrod, Chris1, Author              
Gregersen, Finn, Author
Klepaker, Tom, Author
Schulz, Michael2, Author              
Schluter, Dolph, Author
Vollestad, Leif Asbjorn, Author
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society, ou_2025284              

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 Abstract: BACKGROUND: Studying how trophic traits and niche use are related in natural populations is important in order to understand adaptation and specialization. Here, we describe trophic trait diversity in twenty-five Norwegian freshwater threespine stickleback populations and their putative marine ancestor, and relate trait differences to postglacial lake age. By studying lakes of different ages, depths and distance to the sea we examine key environmental variables that may predict adaptation in trophic position and habitat use. We measured trophic traits including geometric landmarks that integrated variation in head shape as well as gillraker length and number. Trophic position (Tpos) and niche use (alpha) were estimated from stable isotopes (delta(13)C, delta(15)N). A comparison of head shape was also made with two North American benthic-limnetic species pairs. RESULTS: We found that head shape differed between marine and freshwater sticklebacks, with marine sticklebacks having more upturned mouths, smaller eyes, larger opercula and deeper heads. Size-adjusted gillraker lengths were larger in marine than in freshwater stickleback. Norwegian sticklebacks were compared on the same head shape axis as the one differentiating the benthic-limnetic North American threespine stickleback species pairs. Here, Norwegian freshwater sticklebacks with a more "limnetic head shape" had more and longer gillrakers than sticklebacks with "benthic head shape". The "limnetic morph" was positively associated with deeper lakes. Populations differed in alpha (mean +/- sd: 0.76 +/- 0.29) and Tpos (3.47 +/- 0.27), where alpha increased with gillraker length. Larger fish had a higher Tpos than smaller fish. Compared to the ecologically divergent stickleback species pairs and solitary lake populations in North America, Norwegian freshwater sticklebacks had similar range in Tpos and alpha values, but much less trait divergences. CONCLUSIONS: Our results showed trait divergences between threespine stickleback in marine and freshwater environments. Freshwater populations diverged in trophic ecology and trophic traits, but trophic ecology was not related to the elapsed time in freshwater. Norwegian sticklebacks used the same niches as the ecologically divergent North American stickleback species pairs. However, as trophic trait divergences were smaller, and not strongly associated with the ecological niche, ecological adaptations along the benthic-limnetic axis were less developed in Norwegian sticklebacks.

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Language(s): eng - English
 Dates: 2016-03-022016-04-292016-05-132016
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1186/s12862-016-0676-2
BibTex Citekey: Ostbye2016
 Degree: -

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Title: BMC Evolutionary Biology
Source Genre: Journal
 Creator(s):
Tautz, Diethard1, Contributor            
Lampert, Winfried2, Contributor            
Affiliations:
1 Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635            
2 Emeritus Group Lampert, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445636            
Publ. Info: BioMed Central
Pages: - Volume / Issue: 16 Sequence Number: - Start / End Page: 102 Identifier: ISSN: 1471-2148
CoNE: /journals/resource/111000136905006