Brown rats (Rattus norvegicus) have commensally spread from northern China and Mongolia to become among the most invasive species on the planet. Understanding the proximate source(s) of invasion can inform biosecurity plans and eradication strategies for preventing or mitigating impacts to native biodiversity. The Haida Gwaii archipelago, located off the coast of British Columbia, Canada, is a significant nesting site for 1.5 million seabirds across 12 species, half of which are now threatened by brown rats. Local knowledge points to a European origin in the late 1800’s to early 1900’s, though the true source(s) and firm date(s) of invasion remain unknown. To fill these knowledge gaps, we analyzed genotypic data (16,598 SNPs) for 280 brown rats sampled throughout Haida Gwaii relative to a published global database of potential source populations. Principle component analysis and population assignment tests supported multiple potential invasion sources from Europe and North America. Likewise, demographic modelling best supported two invasions into the islands. The first invasion likely occurred in the early 1900’s into the south-central archipelago from Western Europe followed by a more recent invasion in the early 2000’s from Vancouver, British Columbia, into northern Haida Gwaii. The northern invasion of Haida Gwaii could also be indicative of contemporary gene flow between Haida Gwaii and the mainland, representing a significant biosecurity risk. Our results will inform management strategies for invasive rats in Haida Gwaii and serve as a guide for studies in other isolated systems worldwide.
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We thank Gwaii Haanas, Parks Canada employees Goox Beaton, Chris Ashurst, Charlotte Houston, Richard Kennedy and many others for their original collection of the majority of field samples. Computational resources were made available by Compute Canada through the Resources for Research Groups program to MR. This work was funded by Parks Canada Agreement # GC-853 and the Natural Sciences and Engineering Research Council of Canada (NSERC), Discovery Grant # RGPIN- 2019-04621 to MR.
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Topology for competing demographic scenarios (n = 24) modelling the origin of invasive brown rats in Haida Gwaii. All modelling was performed in DIYABC v2.1.0. Each branch point represents an invasion event. Abbreviations are as follows: (WER) Western Europe; (WNA) Western North America; (VAN) Vancouver; (HN) Haida Gwaii, northern cluster; (HC) Haida Gwaii, central cluster; and (HS) Haida Gwaii, southern cluster. Location of timing parameters (t) are shown to the left of each model. The model with the highest posterior probability is indicated with an asterisk (*) (TIFF 3273 kb)
Comparison of admixture coefficients for brown rats (n = 302) sampled across a global distribution. Coefficients were calculated at k = 10 using Admixture v1.3.0 and averaged across 20 iterations. Analysis was repeated using the full SNP dataset (31k; n = 31,266 loci), and subset datasets (17k = 16,598 loci; 5k = 5000 loci). Abbreviation definitions are as follows: (ALN) Aleutian Islands; (CHI) China; (SEA) Southeast Asia; (NER) Northern Europe; (WER) Western Europe; (WNA) Western North America; (ENA) Eastern North America; (SAM) South America; (SND) San Diego; and (VAN) Vancouver (TIFF 466 kb)
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Sjodin, B.M.F., Puckett, E.E., Irvine, R.L. et al. Global origins of invasive brown rats (Rattus norvegicus) in the Haida Gwaii archipelago. Biol Invasions (2020). https://doi.org/10.1007/s10530-020-02390-7
- Invasive species
- Island ecosystem
- Population genomics