Abstract
Despite the significance of biological invasions in the Antarctic region, understanding of the rates of spread and impact of introduced species is limited. Such information is necessary to develop and to justify management actions. Here we quantify rates of spread and changes in impact of the introduced wasp Aphidius matricariae Haliday, which parasitizes the invasive aphid Rhopalosiphum padi (L.), on sub-Antarctic Marion Island, to which the wasp was introduced in ca. 2001. Between 2006 and 2011, the wasp had colonised all coastal sites, with an estimated rate of spread of 3–5 km year−1. Adult abundance doubled over the period, while impact, measured as mean percentage parasitism of R. padi, had increased from 6.9 to 30.1 %. Adult wasps have thermal tolerances (LT50s) of between −18 and 33.8 °C, with a crystallization temperature of −22.9 °C, and little tolerance (ca. 37 h) of low humidity at 10 °C. Desiccation intolerance is probably limiting for the adult wasps, while distribution of their aphid host likely sets ultimate distributional limits, especially towards higher elevations where R. padi is absent, despite the presence of its host grass on the island, Poa cookii (Hook. f.). Rising temperatures are benefitting P. cookii, and will probably do the same for both R. padi and A. matricariae. Our study shows that once established, spread of introduced species on the island may be rapid, emphasizing the importance of initial quarantine.
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Acknowledgments
We thank Aleks Terauds, Alan Tshautshau, and Charlene Janion-Scheepers for assistance in the field, and two anonymous referees for helpful comments on an earlier version of the ms. This work was supported by National Research Foundation of South Africa Grant SNA14071475789 and Australian Research Council Grant DP140101240.
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Lee, J.E., Chown, S.L. Range expansion and increasing impact of the introduced wasp Aphidius matricariae Haliday on sub-Antarctic Marion Island. Biol Invasions 18, 1235–1246 (2016). https://doi.org/10.1007/s10530-015-0967-3
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DOI: https://doi.org/10.1007/s10530-015-0967-3