Northern Fennoscandia via the British Isles: evidence for a novel post-glacial recolonization route by winter moth (Operophtera brumata)

J.C. Andersen, N.P. Havill , B.P. Griffin , J.U. Jepsen, S.B. Hagen , T. Klemola, Barrio I.C., S.A. Kjeldgaard , T.T. Høye , J. Murlis, Y.N. Baranchikov, Andrey V. Selikhovkin, O.P.L. Vindstad, A. Caccone , J.S. Elkinton

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The frequency and severity of outbreaks by pestiferous insects is increasing globally, likely as a result of human-mediated introductions of non-native organisms. However, it is not always apparent whether an outbreak is the result of a recent introduction of an evolutionarily naïve population, or of recent disturbance acting on an existing population that arrived previously during natural range expansion. Here we use approximate Bayesian computation to infer the colonization history of a pestiferous insect, the winter moth, Operophtera brumata L. (Lepidoptera: Geometridae), which has caused widespread defoliation in northern Fennoscandia. We generated genotypes using a suite of 24 microsatellite loci and find that populations of winter moth in northern Europe can be assigned to five genetically distinct clusters that correspond with 1) Iceland, 2) the British Isles, 3) Central Europe and southern Fennoscandia, 4) Eastern Europe, and 5) northern Fennoscandia. We find that the northern Fennoscandia winter moth cluster is most closely related to a population presently found in the British Isles, and that these populations likely diverged around 2,900 years ago. This result suggests that current outbreaks are not the result of a recent introduction, but rather that recent climate or habitat disturbance is acting on existing populations that may have arrived to northern Fennoscandia via pre-Roman traders from the British Isles, and/or by natural dispersal across the North Sea likely using the Orkney Islands of northern Scotland as a stepping-stone before dispersing up the Norwegian coast.

Original languageEnglish
Article numbere49581
Pages (from-to)1-14
Number of pages14
JournalFrontiers of Biogeography
Volume13
Issue number1
DOIs
StatePublished - 2021

Scopus subject areas

  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Keywords

  • Lepidoptera
  • Quaternary climatic oscillations
  • approximate bayesian computation
  • population genetics

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