1 Temperature drives pre-reproductive selection and shapes 1 the biogeography of a female polymorphism 2 Authors: Erik I. Svensson 1* , Beatriz Willink 1 , M. Catherine Duryea 1,† and Lesley T. 3 Lancaster 2 4 Published in: Ecology Letters (2019) https://doi.org/10.1111/ele.13417 5 6 Affiliations: 7 1 Department of Biology, Lund University, SE-223 62 Lund, SWEDEN. 8 2 School of Biological Sciences, University of Aberdeen, Aberdeen, United Kingdom, AB24 9 2TZ 10 *Correspondence to: erik.svensson@biol.lu.se 11 †Current address: Southern New Hampshire University, Manchester, New Hampshire, USA 12 03106 13 AUTHORSHIP STATEMENT 14 E.I.S. conceived the idea of this study, planned the mesocosm experiments and maintained the 15 long-term population study. E.I.S., BW and MCD collected field data and carried out the 16 mesocosm experiments. E.I.S., BW and LL performed the statistical analyses. E.I. wrote the 17 first draft of this paper. All the other authors read and contributed to the writing of the final 18 manuscript. 19 20 DATA ACCESSIBILITY STATEMENT 21 Original data behind all the analyses in this paper and associated R-code will be uplodaded on 22 Dryad (https://datadryad.org/). Correspondence and requests for additional materials should 23 be directed to E.I.S. (erik.svensson@biol.lu.se). 24 25