Perturbation drives changing metapopulation dynamics in a top marine predator

Research output: Contribution to journalJournal articleResearchpeer-review

  • Emma L. Carroll
  • Ailsa Hall
  • Olsen, Morten Tange
  • Aubrie B. Onoufriou
  • Oscar E. Gaggiotti
  • Debbie J. F. Russell

Metapopulation theory assumes a balance between local decays/extinctions and local growth/new colonisations. Here we investigate whether recent population declines across part of the UK harbour seal range represent normal metapopulation dynamics or are indicative of perturbations potentially threatening the metapopulation viability, using 20 years of population trends, location tracking data (n= 380), and UK-wide, multi-generational population genetic data (n= 269). First, we use microsatellite data to show that two genetic groups previously identified are distinct metapopulations: northern and southern. Then, we characterize the northern metapopulation dynamics in two different periods, before and after the start of regional declines (pre-/peri-perturbation). We identify source-sink dynamics across the northern metapopulation, with two putative source populations apparently supporting three likely sink populations, and a recent metapopulation-wide disruption of migration coincident with the perturbation. The northern metapopulation appears to be in decay, highlighting that changes in local populations can lead to radical alterations in the overall metapopulation's persistence and dynamics.

Original languageEnglish
Article number20200318
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume287
Issue number1928
Number of pages10
ISSN0962-8452
DOIs
Publication statusPublished - 2020

    Research areas

  • local population, gene flow, harbour seal, SEALS PHOCA-VITULINA, HARBOR SEALS, F-STATISTICS, POPULATION, DISPERSAL, CONSERVATION, MANAGEMENT, MIGRATION, IDENTIFICATION, ABUNDANCE

ID: 247447789