Summary data for whole genome sequencing on Lottia samples collected from Northern California to Baja from Nov 2020 to Jan 2022

As climatic variation re-shapes global biodiversity, understanding eco-evolutionary feedbacks during species range shifts is of increasing importance. Theory on range expansions distinguishes between two different forms: “pulled” and “pushed” waves. Pulled waves occur when the source of the expansion comes from low-density peripheral populations, while pushed waves occur when recruitment to the expanding edge is supplied by high-density populations closer to the species' core. How extreme events shape pushed/pulled wave expansion events, as well as trailing-edge declines/contractions, remains largely unexplored. We examined eco-evolutionary responses of a marine invertebrate (the owl limpet, Lottia gigantea (urn:lsid:marinespecies.org:taxname:456593)) that increased in abundance during the 2014–2016 marine heatwaves (MHWs) near the poleward edge of its geographic range in the northeastern Pacific. We sampled Lottia gigantea from 19 populations across >11 degrees of latitude to characterize genomic variation, gene flow, and demographic histories across the species' range. This dataset includes sampling data for those individuals, including location, date, size, and sequencing summary metrics. Whole genomes were sequenced and raw genomic data can be found on NCBI (PRJNA1075458). Here we include summary statistics on whole genome data.