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Drifters represented different\n                      <jats:styled-content style=\"fixed-case\">\n                        <jats:italic>A. aurita<\/jats:italic>\n                      <\/jats:styled-content>\n                      life\u2010stages that were traced over 40 consecutive life\u2010cycles from four empirically confirmed start locations. Suitable habitat for polyp recruitment was parameterized from high\u2010resolution bottom topography maps to allow for stepping\u2010stone range expansion across the Baltic Sea, with additional physiological experiments.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Molecular and drift analyses revealed a large degree of isolation, identifying two major clusters in the Baltic Sea: (1) the low saline central\u2010eastern and (2) the intermediate saline south\u2010western regions, respectively. Additionally, molecular analyses confirmed the southern North Sea as an independent cluster with limited connectivity to the Baltic Sea. The Skagerrak\/central North Sea was further confirmed as a transition zone between both regions. Lagrangian simulations suggested only one seeding event from this transition zone (Skagerrak) into the Baltic Sea over the 40\u2010year study period. Furthermore, a 2.5\u2010fold lower genetic diversity in the low saline Baltic relative to the high saline North Sea indicated limited current gene flow. A significant correlation was found between haplotype frequency and salinity in Baltic Sea samples, together with successful settlement of northern Baltic individuals at low salinities.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Main Conclusions<\/jats:title>\n                    <jats:p>\n                      Limited connectivity leads to population differentiation of\n                      <jats:styled-content style=\"fixed-case\">\n                        <jats:italic>A. aurita<\/jats:italic>\n                      <\/jats:styled-content>\n                      in the Baltic Sea. Furthermore, active recruitment at low salinities suggests local adaptation within the low saline Baltic Sea. Local adaptation is likely widespread among Baltic species of marine origin, raising concerns for biodiversity conservation and ecosystem management of the Baltic Sea under continued freshening due to climate change.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/jbi.70099","type":"journal-article","created":{"date-parts":[[2025,12,6]],"date-time":"2025-12-06T09:03:58Z","timestamp":1765011838000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Genetic Differentiation of the Jellyfish\n                    <i>Aurelia aurita<\/i>\n                    Along Steep Environmental Gradients"],"prefix":"10.1111","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2850-4131","authenticated-orcid":false,"given":"Cornelia","family":"Jaspers","sequence":"first","affiliation":[{"name":"Centre for Gelatinous Plankton Ecology and Evolution, DTU Aqua\u2014Technical University of Denmark  Kgs. 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Lyngby Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-6236-9887","authenticated-orcid":false,"given":"Christine","family":"Gawinski","sequence":"additional","affiliation":[{"name":"Department of Arctic and Marine Biology The Arctic University of Norway (UiT)  Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0183-2314","authenticated-orcid":false,"given":"Sanna","family":"Majaneva","sequence":"additional","affiliation":[{"name":"Akvaplan\u2010Niva  Trondheim Norway"},{"name":"Norwegian University of Science and Technology (NTNU)  Trondheim Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4782-4958","authenticated-orcid":false,"given":"Maiju","family":"Lehtiniemi","sequence":"additional","affiliation":[{"name":"Marine and Freshwater Solutions Finnish Environment Institute (SYKE)  Helsinki 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