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Adaptation at a snail’s pace: Successful invasion without rapid adaptation in new thermal environments by Atlantic oyster drills (Urosalpinx cinerea)
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  • Blair Bentley,
  • Brian Cheng,
  • Reid Brennan,
  • John Swenson,
  • Jamie Adkins,
  • Andrew Villeneuve,
  • Lisa Komoroske
Blair Bentley
University of Massachusetts Amherst

Corresponding Author:[email protected]

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Brian Cheng
University of Massachusetts Amherst
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Reid Brennan
GEOMAR
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John Swenson
University of Massachusetts Amherst
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Jamie Adkins
University of Massachusetts Amherst
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Andrew Villeneuve
University of New Hampshire
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Lisa Komoroske
University of Massachusetts Amherst
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Abstract

Invasive species with native ranges spanning strong environmental gradients that establish in new habitats are particularly well-suited for examining the roles of selection and population history in rapid environmental adaptation, providing insight into potential evolutionary responses to climate change. The Atlantic oyster drill (Urosalpinx cinerea) is a marine snail with a native range spanning the strongest marine thermal gradient in the world that has established invasive populations on the U.S. Pacific coast. Here, we leverage this system using genome-wide SNPs and environmental data to examine invasion history and identify genotype-environment associations indicative of local adaptation across its native range, and then assess evidence for predicted allelic frequency shifts signaling rapid adaptation in invasive populations. We demonstrate strong genetic structuring among native regions aligned with life history expectations and identify southern New England as the source of invasive populations. We also identify putatively thermally adaptive loci across the native range, for which two invasive populations show significant divergence from source populations. However, we find no evidence of directional shifts in allele frequencies as would be predicted by environmental selection, suggesting that divergence is likely due to genetic drift rather than rapid adaptation. Alternatively, the success of new populations in environments differing from their origin may be due to relaxed selection pressures associated with more benign conditions, and/or standing capacity for phenotypic plasticity. This demonstrates the utility of invasive species for understanding evolutionary responses to changing environments, and the importance of considering population history and environmental selection pressures when evaluating adaptative capacity.
Submitted to Molecular Ecology
15 Apr 2024Review(s) Completed, Editorial Evaluation Pending
25 Jun 2024Editorial Decision: Revise Minor
11 Sep 20241st Revision Received
13 Sep 2024Submission Checks Completed
13 Sep 2024Assigned to Editor
13 Sep 2024Review(s) Completed, Editorial Evaluation Pending
30 Sep 2024Editorial Decision: Accept