--- _id: '8809' abstract: - lang: eng text: When divergent populations are connected by gene flow, the establishment of complete reproductive isolation usually requires the joint action of multiple barrier effects. One example where multiple barrier effects are coupled consists of a single trait that is under divergent natural selection and also mediates assortative mating. Such multiple-effect traits can strongly reduce gene flow. However, there are few cases where patterns of assortative mating have been described quantitatively and their impact on gene flow has been determined. Two ecotypes of the coastal marine snail, Littorina saxatilis, occur in North Atlantic rocky-shore habitats dominated by either crab predation or wave action. There is evidence for divergent natural selection acting on size, and size-assortative mating has previously been documented. Here, we analyze the mating pattern in L. saxatilis with respect to size in intensively-sampled transects across boundaries between the habitats. We show that the mating pattern is mostly conserved between ecotypes and that it generates both assortment and directional sexual selection for small male size. Using simulations, we show that the mating pattern can contribute to reproductive isolation between ecotypes but the barrier to gene flow is likely strengthened more by sexual selection than by assortment. article_processing_charge: No author: - first_name: Samuel full_name: Perini, Samuel last_name: Perini - first_name: Marina full_name: Rafajlovic, Marina last_name: Rafajlovic - first_name: Anja M full_name: Westram, Anja M id: 3C147470-F248-11E8-B48F-1D18A9856A87 last_name: Westram orcid: 0000-0003-1050-4969 - first_name: Kerstin full_name: Johannesson, Kerstin last_name: Johannesson - first_name: Roger full_name: Butlin, Roger last_name: Butlin citation: ama: 'Perini S, Rafajlovic M, Westram AM, Johannesson K, Butlin R. Data from: Assortative mating, sexual selection and their consequences for gene flow in Littorina. 2020. doi:10.5061/dryad.qrfj6q5cn' apa: 'Perini, S., Rafajlovic, M., Westram, A. M., Johannesson, K., & Butlin, R. (2020). Data from: Assortative mating, sexual selection and their consequences for gene flow in Littorina. Dryad. https://doi.org/10.5061/dryad.qrfj6q5cn' chicago: 'Perini, Samuel, Marina Rafajlovic, Anja M Westram, Kerstin Johannesson, and Roger Butlin. “Data from: Assortative Mating, Sexual Selection and Their Consequences for Gene Flow in Littorina.” Dryad, 2020. https://doi.org/10.5061/dryad.qrfj6q5cn.' ieee: 'S. Perini, M. Rafajlovic, A. M. Westram, K. Johannesson, and R. Butlin, “Data from: Assortative mating, sexual selection and their consequences for gene flow in Littorina.” Dryad, 2020.' ista: 'Perini S, Rafajlovic M, Westram AM, Johannesson K, Butlin R. 2020. Data from: Assortative mating, sexual selection and their consequences for gene flow in Littorina, Dryad, 10.5061/dryad.qrfj6q5cn.' mla: 'Perini, Samuel, et al. Data from: Assortative Mating, Sexual Selection and Their Consequences for Gene Flow in Littorina. Dryad, 2020, doi:10.5061/dryad.qrfj6q5cn.' short: S. Perini, M. Rafajlovic, A.M. Westram, K. Johannesson, R. Butlin, (2020). date_created: 2020-11-25T11:07:25Z date_published: 2020-07-01T00:00:00Z date_updated: 2023-08-22T07:13:37Z day: '01' department: - _id: NiBa doi: 10.5061/dryad.qrfj6q5cn has_accepted_license: '1' license: https://creativecommons.org/publicdomain/zero/1.0/ main_file_link: - open_access: '1' url: https://doi.org/10.5061/dryad.qrfj6q5cn month: '07' oa: 1 oa_version: Published Version publisher: Dryad related_material: record: - id: '7995' relation: used_in_publication status: public status: public title: 'Data from: Assortative mating, sexual selection and their consequences for gene flow in Littorina' tmp: image: /images/cc_0.png legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode name: Creative Commons Public Domain Dedication (CC0 1.0) short: CC0 (1.0) type: research_data_reference user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf year: '2020' ...