Dear all,

We are pleased to share our  publication:
Louis, M., Korlević, P., Nykänen, M. et al. Ancient dolphin genomes reveal 
rapid repeated adaptation to coastal waters. Nat Commun 14, 4020 (2023). 
https://doi.org/10.1038/s41467-023-39532-z


Abstract

Parallel evolution provides strong evidence of adaptation by natural selection 
due to local environmental variation. Yet, the chronology, and mode of the 
process of parallel evolution remains debated. Here, we harness the temporal 
resolution of paleogenomics to address these long-standing questions, by 
comparing genomes originating from the mid-Holocene (8610-5626 years before 
present, BP) to contemporary pairs of coastal-pelagic ecotypes of bottlenose 
dolphin. We find that the affinity of ancient samples to coastal populations 
increases as the age of the samples decreases. We assess the youngest genome 
(5626 years BP) at sites previously inferred to be under parallel selection to 
coastal habitats and find it contained coastal-associated genotypes. Thus, 
coastal-associated variants rose to detectable frequencies close to the 
emergence of coastal habitat. Admixture graph analyses reveal a reticulate 
evolutionary history between pelagic and coastal populations, sharing standing 
genetic variation that facilitated rapid adaptation to newly emerged coastal 
habitats.


The article is available at: https://rdcu.be/dg9g7


On behalf of all co-authors,

Marie


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