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Spatial variation in climate mediates gene flow across an island archipelago

Logan, Michael L.; Duryea, Katie LU ; Molnar, Orsolya R.; Kessler, Benji J. and Calsbeek, Ryan (2016) In Evolution 70(10). p.2395-2403
Abstract

High levels of gene flow among partially isolated populations can overwhelm selection and limit local adaptation. This process, known as “gene swamping,” can homogenize genetic diversity among populations and reduce the capacity of a species to withstand rapid environmental change. We studied brown anole lizards (Anolis sagrei) distributed across seven islands in The Bahamas. We used microsatellite markers to estimate gene flow among islands and then examined the correlation between thermal performance and island temperature. The thermal optimum for sprint performance was correlated with both mean and maximum island temperature, whereas performance breadth was not correlated with any measure of temperature variation. Gene flow between... (More)

High levels of gene flow among partially isolated populations can overwhelm selection and limit local adaptation. This process, known as “gene swamping,” can homogenize genetic diversity among populations and reduce the capacity of a species to withstand rapid environmental change. We studied brown anole lizards (Anolis sagrei) distributed across seven islands in The Bahamas. We used microsatellite markers to estimate gene flow among islands and then examined the correlation between thermal performance and island temperature. The thermal optimum for sprint performance was correlated with both mean and maximum island temperature, whereas performance breadth was not correlated with any measure of temperature variation. Gene flow between islands decreased as the difference between mean island temperatures increased, even when those islands were adjacent to one another. These data suggest that phenotypic variation is the result of either (1) local genetic adaptation with selection against immigrants maintaining variation in the thermal optimum, (2) irreversible forms of adaptive plasticity such that immigrants have reduced fitness, or (3) an interaction between fixed genetic differences and plasticity. In general, the patterns of gene flow we observed suggest that local thermal environments represent important ecological filters that can mediate gene flow on relatively fine geographic scales.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bahamas, climate change, metapopulation, natural selection, thermal performance curve, thermoregulation
in
Evolution
volume
70
issue
10
pages
9 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:84984688344
  • wos:000385550700017
ISSN
0014-3820
DOI
10.1111/evo.13031
language
English
LU publication?
yes
id
a213461f-7b6d-4c59-ae1e-04602787d120
date added to LUP
2017-02-07 11:51:16
date last changed
2017-10-22 05:26:09
@article{a213461f-7b6d-4c59-ae1e-04602787d120,
  abstract     = {<p>High levels of gene flow among partially isolated populations can overwhelm selection and limit local adaptation. This process, known as “gene swamping,” can homogenize genetic diversity among populations and reduce the capacity of a species to withstand rapid environmental change. We studied brown anole lizards (Anolis sagrei) distributed across seven islands in The Bahamas. We used microsatellite markers to estimate gene flow among islands and then examined the correlation between thermal performance and island temperature. The thermal optimum for sprint performance was correlated with both mean and maximum island temperature, whereas performance breadth was not correlated with any measure of temperature variation. Gene flow between islands decreased as the difference between mean island temperatures increased, even when those islands were adjacent to one another. These data suggest that phenotypic variation is the result of either (1) local genetic adaptation with selection against immigrants maintaining variation in the thermal optimum, (2) irreversible forms of adaptive plasticity such that immigrants have reduced fitness, or (3) an interaction between fixed genetic differences and plasticity. In general, the patterns of gene flow we observed suggest that local thermal environments represent important ecological filters that can mediate gene flow on relatively fine geographic scales.</p>},
  author       = {Logan, Michael L. and Duryea, Katie and Molnar, Orsolya R. and Kessler, Benji J. and Calsbeek, Ryan},
  issn         = {0014-3820},
  keyword      = {Bahamas,climate change,metapopulation,natural selection,thermal performance curve,thermoregulation},
  language     = {eng},
  month        = {10},
  number       = {10},
  pages        = {2395--2403},
  publisher    = {Wiley-Blackwell},
  series       = {Evolution},
  title        = {Spatial variation in climate mediates gene flow across an island archipelago},
  url          = {http://dx.doi.org/10.1111/evo.13031},
  volume       = {70},
  year         = {2016},
}