As the goose flies: Migration Routes and Timing Influence Patterns of Genetic Diversity in a Circumpolar Migratory Herbivore

Robert E. Wilson*, Sarah A. Sonsthagen, Jeffrey M. DeCosta, Michael D. Sorenson, Anthony David Fox, Melanie Weaver, Dan Skalos, Alexander V. Kondratyev, Kim T. Scribner, Alyn Walsh, Craig R. Ely, Sandra L. Talbot

*Corresponding author for this work

    Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

    7 Citations (Scopus)

    Abstract

    Migration schedules and the timing of other annual events (e.g., pair formation and molt) can affect the distribution of genetic diversity as much as where these events occur. The greater white-fronted goose (Anser albifrons) is a circumpolar goose species, exhibiting temporal and spatial variation of events among populations during the annual cycle. Previous range-wide genetic assessments of the nuclear genome based on eight microsatellite loci suggest a single, largely panmictic population despite up to five subspecies currently recognized based on phenotypic differences. We used double digest restriction-site associated DNA (ddRAD-seq) and mitochondrial DNA (mtDNA) sequence data to re-evaluate estimates of spatial genomic structure and to characterize how past and present
    processes have shaped the patterns of genetic diversity and connectivity across the Arctic and subarctic. We uncovered previously undetected inter-population differentiation with genetic clusters corresponding to sampling locales associated with current management groups. We further observed subtle genetic clustering within each management unit that can be at least partially explained by the timing and directionality of migration events along with other behaviors during the annual cycle. The Tule Goose (A. a. elgasi) and Greenland subspecies (A. a. flavirostris) showed the highest level of divergence among all sampling locales investigated. The recovery of previously undetected broad and fine-scale spatial structure suggests that the strong cultural transmission of migratory behavior restricts gene flow across portions of the species’ range. Our data further highlight the importance of re-evaluating previous assessments conducted based on a small number of highly variable genetic markers in phenotypically diverse species.
    Original languageEnglish
    Article number1067
    JournalDiversity
    Volume14
    Issue12
    Number of pages23
    ISSN1424-2818
    DOIs
    Publication statusPublished - Dec 2022

    Keywords

    • Anser albifrons
    • circumpolar distribution
    • connectivity
    • gene flow
    • greater white-fronted goose
    • migratory flyway
    • population structure

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