Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

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

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 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/.

PMC Copyright notice

Modelling framework to generate the maps showing permissive thermal conditions for development. First, for each grid cells, degree-day (DD) units accumulated in a day (dDD) was determined by calculating the degree-units (D) for each time slice of the day (8 time slices per day). The value D for each time slice is calculated as the difference between the temperature at that time, or the upper temperature cut-off (21 °C), whichever is smaller, and the lower development threshold (Tmin). To calculate dDD, total D units in a day are summed and divided by 8 (see^31,32). Finally, annual cumulative degree-days (ADD) for each year was derived by summing the dDD values for the entire year. The final step involved the conversion of the ADD units into potential transmission index (PTI) units by dividing the ADD units by the threshold DD units for each species. The maps were generated in ArcGIS software version 10.6 (ESRI 2011, ArcGIS Desktop: Release 10. Redlands, CA, Environmental Systems Research Institute, https://www.esri.com/en-us/home).