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• W4313485071 endingPage "338" @default.
• W4313485071 startingPage "328" @default.
• W4313485071 abstract "Mass mortality events are increasing globally in frequency and magnitude, largely as a result of human-induced change. The effects of these mass mortality events, in both the long and short term, are of imminent concern because of their ecosystem impacts. Genomic data can be used to reveal some of the population-level changes associated with mass mortality events. Here, we use reduced-representation sequencing to identify potential short-term genetic impacts of a mass mortality event associated with a sea star wasting outbreak. We tested for changes in the population for genetic differentiation, diversity, and effective population size between pre–sea star wasting and post–sea star wasting populations of Pisaster ochraceus—a species that suffered high sea star wasting-associated mortality (75%–100% at 80% of sites). We detected no significant population-based genetic differentiation over the spatial scale sampled; however, the post–sea star wasting population tended toward more differentiation across sites than the pre–sea star wasting population. Genetic estimates of effective population size did not detectably change, consistent with theoretical expectations; however, rare alleles were lost. While we were unable to detect significant population-based genetic differentiation or changes in effective population size over this short time period, the genetic burden of this mass mortality event may be borne by future generations, unless widespread recruitment mitigates the population decline. Prior results from P. ochraceus indicated that natural selection played a role in altering allele frequencies following this mass mortality event. In addition to the role of selection found in a previous study on the genomic impacts of sea star wasting on P. ochraceus, our current study highlights the potential role the stochastic loss of many individuals plays in altering how genetic variation is structured across the landscape. Future genetic monitoring is needed to determine long-term genetic impacts in this long-lived species. Given the increased frequency of mass mortality events, it is important to implement demographic and genetic monitoring strategies that capture baselines and background dynamics to better contextualize species’ responses to large perturbations." @default.
• W4313485071 created "2023-01-06" @default.
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• W4313485071 date "2022-12-01" @default.
• W4313485071 modified "2023-09-26" @default.
• W4313485071 title "Minor Genetic Consequences of a Major Mass Mortality: Short-Term Effects in <i>Pisaster ochraceus</i>" @default.
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• W4313485071 doi "https://doi.org/10.1086/722284" @default.
• W4313485071 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36716481" @default.
• W4313485071 hasPublicationYear "2022" @default.
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