Standing chromosomal variation in Lake Whitefish species pairs: the role of historical contingency and relevance for speciation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985904%3A_____%2F17%3A00471419" target="_blank" >RIV/67985904:_____/17:00471419 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1111/mec.13816" target="_blank" >http://dx.doi.org/10.1111/mec.13816</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/mec.13816" target="_blank" >10.1111/mec.13816</a>

Result language

angličtina

Original language name

Standing chromosomal variation in Lake Whitefish species pairs: the role of historical contingency and relevance for speciation

Original language description

The role of chromosome changes in speciation remains a debated topic, although demographic conditions associated with divergence should promote their appearance. We tested a potential relationship between chromosome changes and speciation by studying two Lake Whitefish (Coregonus clupeaformis) lineages that recently colonized postglacial lakes following allopatry. A dwarf limnetic species evolved repeatedly from the normal benthic species, becoming reproductively isolated. Lake Whitefish hybrids experience mitotic and meiotic instability, which may result from structurally divergent chromosomes. Motivated by this observation, we test the hypothesis that chromosome organization differs between Lake Whitefish species pairs using cytogenetics. While chromosome and fundamental numbers are conserved between the species (2n = 80, NF = 98), we observe extensive polymorphism of subtle karyotype traits. We describe intrachromosomal differences associated with heterochromatin and repetitive DNA, and test for parallelism among three sympatric species pairs. Multivariate analyses support the hypothesis that differentiation at the level of subchromosomal markers mostly appeared during allopatry. Yet we find no evidence for parallelism between species pairs among lakes, consistent with colonization effect or postcolonization differentiation. The reported intrachromosomal polymorphisms do not appear to play a central role in driving adaptive divergence between normal and dwarf Lake Whitefish. We discuss how chromosomal differentiation in the Lake Whitefish system may contribute to the destabilization of mitotic and meiotic chromosome segregation in hybrids, as documented previously. The chromosome structures detected here are still difficult to sequence and assemble, demonstrating the value of cytogenetics as a complementary approach to understand the genomic bases of speciation.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

<a href="/en/project/GA14-02940S" target="_blank" >GA14-02940S: Ploidy and hybrid diversity in sturgeons (Acipenseriformes) and its impacts on conservation and breeding</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Molecular Ecology

ISSN

0962-1083

e-ISSN

—

Volume of the periodical

26

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

178-192

UT code for WoS article

000391940600012

EID of the result in the Scopus database

2-s2.0-84987621933