{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T16:52:03Z","timestamp":1791996723092,"version":"4.4.0"},"reference-count":30,"publisher":"Wiley","issue":"19","license":[{"start":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T00:00:00Z","timestamp":1790553600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T00:00:00Z","timestamp":1790553600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Molecular Ecology"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Hybrid zones provide opportunities to study the operation of barriers to gene flow as they play out in natural environments. However, comparative analysis is difficult because both hybrid zones and the methods used to analyse them vary widely. Gippner et\u00a0al. (2026) brought together data on 108 animal hybrid zones. They argued that cline width in these zones provides a proxy for reproductive isolation (RI). Here, we comment on what cline widths do and don't tell us about the evolutionary progression towards the completion of speciation.<\/jats:p>","DOI":"10.1111\/mec.70558","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:23:48Z","timestamp":1790655828000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Cline Widths, Barriers to Gene Flow and Reproductive Isolation: A Comment on Gippner et\u00a0al. 2026"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4736-0954","authenticated-orcid":false,"given":"Roger","family":"Butlin","sequence":"first","affiliation":[{"name":"Ecology and Evolutionary Biology, School of Bioscience The University of Sheffield  Sheffield UK"},{"name":"Department of Marine Sciences University of Gothenburg, Tj\u00e4rn\u00f6 Marine Laboratory  Str\u00f6mstad Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0472-9299","authenticated-orcid":false,"given":"Sean","family":"Stankowski","sequence":"additional","affiliation":[{"name":"Department of Genetics, Evolution, and Environment University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/oso\/9780195069174.003.0002"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.es.16.110185.000553"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1093\/evolut\/qpac004"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/jeb.14029"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1093\/evolinnean\/kzag011"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1558-5646.1989.tb04233.x"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0014-3820.2006.tb01143.x"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.2103963118"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-025-65457-w"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1558-5646.2008.00491.x"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/mec.70361"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0169-5347(00)01873-5"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tig.2024.01.002"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/0169-5347(95)90031-4"},{"key":"e_1_2_11_16_1","first-page":"2070","article-title":"Dispersal Predicts Hybrid Zone Widths Across Animal Diversity: Implications for Species Borders Under Incomplete Reproductive Isolation","volume":"55","author":"McEntee J. 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