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. 2020 Oct 14;10:17323. doi: 10.1038/s41598-020-74358-5

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© The Author(s) 2020

Open Access This 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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Annual variation in DD accumulation around Cambridge Bay from 1980 to 2017. (a) Heatmap and (b) graph showing the trend and variability in the potential transmission index for UP and VE within 50 km of Cambridge Bay from 1980 through to 2017. The PTI < 1 (blue colour in the heatmap) indicates unsuitable thermal conditions for L1–L3 development in a single summer. In the graph, the lines represent the fit of loess regression (span 0.4). The vertical dotted red line represents the year 2009 after which the PTI for both parasites was consistently > 1.