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Gene flow relates to evolutionary divergence among populations at the range margin

Kanuch, Peter and Kiehl, Berrit and Cassel-Lundhagen, Anna and Laugen, Ane and Low, Matthew and Berggren, Åsa (2020). Gene flow relates to evolutionary divergence among populations at the range margin. PeerJ. 8 , e10036
[Journal article]

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Abstract

Background: Morphological differentiation between populations resulting from local adaptations to environmental conditions is likely to be more pronounced in populations with increasing genetic isolation. In a previous study a positive clinal variation in body size was observed in isolated Roesel's bush-cricket, Metrioptera roeselii, populations, but were absent from populations within a continuous distribution at the same latitudinal range. This observational study inferred that there was a phenotypic effect of gene flow on climate-induced selection in this species.Methods: To disentangle genetic versus environmental drivers of population differences in morphology, we measured the size of four different body traits in wild-caught individuals from the two most distinct latitudinally-matched pairs of populations occurring at about 60 degrees N latitude in northern Europe, characterised by either restricted or continuous gene flow, and corresponding individuals raised under laboratory conditions.Results: Individuals that originated from the genetically isolated populations were always bigger (femur, pronotum and genital appendages) when compared to individuals from latitudinally-matched areas characterised by continuous gene flow between populations. The magnitude of this effect was similar for wild-caught and laboratory-reared individuals. We found that previously observed size cline variation in both male and female crickets was likely to be the result of local genetic adaptation rather than phenotypic plasticity.Conclusions: This strongly suggests that restricted gene flow is of major importance for frequencies of alleles that participate in climate-induced selection acting to favour larger phenotypes in isolated populations towards colder latitudes.

Authors/Creators:Kanuch, Peter and Kiehl, Berrit and Cassel-Lundhagen, Anna and Laugen, Ane and Low, Matthew and Berggren, Åsa
Title:Gene flow relates to evolutionary divergence among populations at the range margin
Year of publishing :2020
Volume:8
Article number:e10036
Number of Pages:18
Publisher:PEERJ INC
ISSN:2167-8359
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Adaptive divergence, Body size, Climate, Genetic isolation, Orthoptera
URN:NBN:urn:nbn:se:slu:epsilon-p-108638
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108638
Additional ID:
Type of IDID
DOI10.7717/peerj.10036
Web of Science (WoS)000580879600001
ID Code:18681
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:16 Nov 2020 16:43
Metadata Last Modified:16 Nov 2020 16:51

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