Objective Speciation is a central process in evolution that involves the origin of barriers to gene flow between populations. Species are typically isolated by several barriers and assembly of multiple barriers separating the same populations seems to be critical to the evolution of strong reproductive isolation. Barriers resulting from direct selection can become coincident through a process of coupling while reinforcement can add barrier traits that are not under direct selection. In the presence of gene flow, these processes are opposed by recombination. While recent research using the latest sequencing technologies has provided much increased knowledge of patterns of differentiation and the genetic basis of local adaptation, it has so far added little to understanding of the coupling and reinforcement processes. In this project, I will focus on the accumulation of barriers to gene exchange and the processes underlying increasing reproductive isolation. I will use the power of natural contact zones, combined with novel manipulative experiments, to separate the processes that underlie patterns of differentiation and introgression. The Littorina saxatilis model system allows me to do this with both local replication and a contrast between distinct spatial contexts on a larger geographic scale. I will use modelling to determine how processes interact and to investigate the conditions most likely to promote coupling and reinforcement. Overall, the project will provide major new insights into the speciation process, particularly revealing the requirements for progress towards complete reproductive isolation. Fields of science natural sciencesbiological sciencesevolutionary biology Keywords speciation local adaptation Programme(s) H2020-EU.1.1. - EXCELLENT SCIENCE - European Research Council (ERC) Main Programme Topic(s) ERC-ADG-2015 - ERC Advanced Grant Call for proposal ERC-2015-AdG See other projects for this call Funding Scheme ERC-ADG - Advanced Grant Host institution THE UNIVERSITY OF SHEFFIELD Net EU contribution € 1 524 404,76 Address FIRTH COURT WESTERN BANK S10 2TN Sheffield United Kingdom See on map Region Yorkshire and the Humber South Yorkshire Sheffield Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 1 524 404,76 Beneficiaries (2) Sort alphabetically Sort by Net EU contribution Expand all Collapse all THE UNIVERSITY OF SHEFFIELD United Kingdom Net EU contribution € 1 524 404,76 Address FIRTH COURT WESTERN BANK S10 2TN Sheffield See on map Region Yorkshire and the Humber South Yorkshire Sheffield Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 1 524 404,76 GOETEBORGS UNIVERSITET Sweden Net EU contribution € 975 521,88 Address VASAPARKEN 405 30 Goeteborg See on map Region Södra Sverige Västsverige Västra Götalands län Activity type Higher or Secondary Education Establishments Links Contact the organisation Opens in new window Website Opens in new window Participation in EU R&I programmes Opens in new window HORIZON collaboration network Opens in new window Total cost € 975 521,88