Strong positive selection on cold hardiness and relaxed selection on heat hardiness experienced by range-expanding populations may help to explain why ectothermic animals generally have broader thermal tolerance towards the poles, and shed new light on their climate vulnerabilities.
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The author thanks Mary Power for helpful comments.
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Williams, C. Insect thermal baggage. Nature Clim Change 6, 543–544 (2016). https://doi.org/10.1038/nclimate3042
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DOI: https://doi.org/10.1038/nclimate3042