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. 2021 Jul 17;166(10):2693–2702. doi: 10.1007/s00705-021-05162-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Regional map showing sampling locations. The map shows the region and number of colonies sampled by year. The 2009/10 colonies are yellow, the 2016 colonies are blue, and feral colonies are marked with *. Four feral samples are not listed on the map, as their location was unknown. The table at the bottom shows the number of samples taken for each group by year and month.