Widespread phenotypic and genetic divergence along altitudinal gradients in animals

Keller, I.; Alexander, J. M.; Holderegger, R.; Edwards, P. J. (2013). Widespread phenotypic and genetic divergence along altitudinal gradients in animals. Journal of Evolutionary Biology, 26(12), pp. 2527-2543. Wiley 10.1111/jeb.12255

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Altitudinal gradients offer valuable study systems to investigate how adap- tive genetic diversity is distributed within and between natural populations and which factors promote or prevent adaptive differentiation. The environ- mental clines along altitudinal gradients tend to be steep relative to the dispersal distance of many organisms, providing an opportunity to study the joint effects of divergent natural selection and gene flow. Temperature is one variable showing consistent altitudinal changes, and altitudinal gradi- ents can therefore provide spatial surrogates for some of the changes antici- pated under climate change. Here, we investigate the extent and patterns of adaptive divergence in animal populations along altitudinal gradients by sur- veying the literature for (i) studies on phenotypic variation assessed under common garden or reciprocal transplant designs and (ii) studies looking for signatures of divergent selection at the molecular level. Phenotypic data show that significant between-population differences are common and taxo- nomically widespread, involving traits such as mass, wing size, tolerance to thermal extremes and melanization. Several lines of evidence suggest that some of the observed differences are adaptively relevant, but rigorous tests of local adaptation or the link between specific phenotypes and fitness are sorely lacking. Evidence for a role of altitudinal adaptation also exists for a number of candidate genes, most prominently haemoglobin, and for anony- mous molecular markers. Novel genomic approaches may provide valuable tools for studying adaptive diversity, also in species that are not amenable to experimentation.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Keller, Irene

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

1010-061X

Publisher:

Wiley

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

29 Apr 2014 11:00

Last Modified:

08 Sep 2015 09:58

Publisher DOI:

10.1111/jeb.12255

BORIS DOI:

10.7892/boris.44859

URI:

https://boris.unibe.ch/id/eprint/44859

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