Evaluating genomic divergence and parallelism in replicate ecomorphs from young and old cichlid adaptive radiations

Mc Gee, Matthew David; Neches, Russell Y.; Seehausen, Ole (2016). Evaluating genomic divergence and parallelism in replicate ecomorphs from young and old cichlid adaptive radiations. Molecular Ecology, 25(1), pp. 260-268. Wiley-Blackwell 10.1111/mec.13463

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Comparative genomic studies of closely related species typically focus on single species pairs at one given stage of divergence. That makes it difficult to infer the continuum of evolutionary process during speciation and beyond. Here, we use wholegenome resequencing to examine genomic patterns of divergence in three sympatric cichlid species pairs with very similar functional and ecological differentiation, but different ages. We find a strong signature of increasing genomic divergence with time in both the mitochondrial genome and the nuclear genome. In contrast to many other systems, we find that in these cichlids, regions of elevated relative differentiation also exhibit increased absolute differentiation. We detect a signature of convergent evolution in a comparison of outlier regions across all three species pair comparisons, but the extent of it is modest, and regions that are strongly divergent in any one pair tend to be only slightly elevated in the other pairs, consistent with a repeatable but polygenic basis of traits that characterize the ecomorphs. Our results suggest that strong functional phenotypic differentiation, as seen in all three species pairs, is generally associated with a clear signature of genomic divergence, even in the youngest species pair.

Item Type:

Journal Article (Original Article)

Division/Institute:

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

UniBE Contributor:

Seehausen, Ole

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0962-1083

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

12 Jul 2017 15:49

Last Modified:

12 Jul 2017 15:49

Publisher DOI:

10.1111/mec.13463

PubMed ID:

26558354

BORIS DOI:

10.7892/boris.99717

URI:

https://boris.unibe.ch/id/eprint/99717

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