Parasites contribute to ecologically dependent postmating isolation in the adaptive radiation of three-spined stickleback.

El Nagar, Aliya; MacColl, Andrew D.C.

Abstract

Spatial variation in parasitic infections is common, and has the potential to drive population divergence and reproductive isolation of hosts. However, despite support from theory and model laboratory systems, not much strong evidence has been forthcoming from the wild. Here we show that parasites are likely to cause reproductive isolation in the adaptive radiation of three-spined stickleback. Adjacent wild populations on the Scottish island of North Uist differ greatly and consistently in the occurrence of different parasites that have substantial effects on fitness. Lab-reared fish are more resistant to experimental infection by parasite species from their own population. Furthermore, hybrid backcrosses between the host populations are more resistant to the parasites from the parental population to which they are more closely related. These patterns provide strong evidence that parasites can cause ecological speciation, by contributing to selection against migrants and ecologically dependent postmating isolation.

Citation

El Nagar, A., & MacColl, A. D. (2016). Parasites contribute to ecologically dependent postmating isolation in the adaptive radiation of three-spined stickleback. Proceedings of the Royal Society B: Biological Sciences, 283(1836), 1-7. https://doi.org/10.1098/rspb.2016.0691

• Journal Article Type: Article
• Acceptance Date: Jul 18, 2016
• Online Publication Date: Aug 10, 2016
• Publication Date: Aug 17, 2016
• Deposit Date: Aug 1, 2016
• Publicly Available Date: Aug 10, 2016
• Journal: Proceedings of the Royal Society B
• Print ISSN: 0962-8452
• Electronic ISSN: 1471-2954
• Publisher: The Royal Society
• Peer Reviewed: Peer Reviewed
• Volume: 283
• Issue: 1836
• Article Number: 20160691
• Pages: 1-7
• DOI: https://doi.org/10.1098/rspb.2016.0691
• Keywords: Speciation; Divergent evolution; Local adaptation; Gasterosteus aculeatus; Parasites
• Public URL: https://nottingham-repository.worktribe.com/output/805331
• Publisher URL: http://rspb.royalsocietypublishing.org/content/283/1836/20160691
• Contract Date: Aug 1, 2016