University of Oulu

Hämälä, T. , Mattila, T. M. and Savolainen, O. (2018), Local adaptation and ecological differentiation under selection, migration, and drift in Arabidopsis lyrata*. Evolution, 72: 1373-1386. doi:10.1111/evo.13502

Local adaptation and ecological differentiation under selection, migration, and drift in Arabidopsis lyrata

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Author: Hämälä, Tuomas1,2; Mattila, Tiina M.1; Savolainen, Outi1,2
Organizations: 1Department of Ecology and Genetics, University of Oulu, FI‐90014 Oulu, Finland
2Biocenter Oulu, University of Oulu, FI‐90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019040411184
Language: English
Published: John Wiley & Sons, 2018
Publish Date: 2019-05-09
Description:

Abstract

How the balance between selection, migration, and drift influences the evolution of local adaptation has been under intense theoretical scrutiny. Yet, empirical studies that relate estimates of local adaptation to quantification of gene flow and effective population sizes have been rare. Here, we conducted a reciprocal transplant trial, a common garden trial, and a whole‐genome‐based demography analysis to examine these effects among Arabidopsis lyrata populations from two altitudinal gradients in Norway. Demography simulations indicated that populations within the two gradients are connected by gene flow (0.1 < 4Nₑm < 11) and have small effective population sizes (Nₑ < 6000), suggesting that both migration and drift can counteract local selection. However, the three‐year field experiments showed evidence of local adaptation at the level of hierarchical multiyear fitness, attesting to the strength of differential selection. In the lowland habitat, local superiority was associated with greater fecundity, while viability accounted for fitness differences in the alpine habitat. We also demonstrate that flowering time differentiation has contributed to adaptive divergence between these locally adapted populations. Our results show that despite the estimated potential of gene flow and drift to hinder differentiation, selection among these A. lyrata populations has resulted in local adaptation.

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Series: Evolution
ISSN: 0014-3820
ISSN-E: 1558-5646
ISSN-L: 0014-3820
Volume: 72
Issue: 7
Pages: 1373 - 1386
DOI: 10.1111/evo.13521
OADOI: https://oadoi.org/10.1111/evo.13521
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
Subjects:
Funding: This work was financially supported by Biocenter Oulu (to TH and OS), Eemil Aaltonen Foundation (to TH and TMM), and Academy of Finland's Research Council for Biosciences and Environment (decision 132611 to OS).
Academy of Finland Grant Number: 132611
Detailed Information: 132611 (Academy of Finland Funding decision)
Dataset Reference: Supporting information:
  https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2Fevo.13502&file=evo13502-sup-0001-SuppMat.pdf
https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2Fevo.13502&file=evo13502-sup-0002-tableS2-S5.xlsx
Copyright information: © 2018 The Author(s). Evolution © 2018 The Society for the Study of Evolution. This is the peer reviewed version of the following article: Hämälä, T. , Mattila, T. M. and Savolainen, O. (2018), Local adaptation and ecological differentiation under selection, migration, and drift in Arabidopsis lyrata*. Evolution, 72: 1373-1386, which has been published in final form at https://doi.org/10.1111/evo.13502. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.