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We investigated the population genomics of the common benthic brooding Antarctic amphipod\n                    <jats:italic>Cheirimedon femoratus<\/jats:italic>\n                    (Pfeffer, 1888), using 8837 high\u2010quality single\u2010nucleotide polymorphisms (SNPs) from 87 individuals collected at 4 sites in the South Shetland Islands, separated by up to 200\u2009km: Deception Island, King George Island, Livingston Island, and Snow Island. While Admixture,\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    , principal component analysis (PCA), and demographic (Ne) analyses revealed a generally weak population genetic structure, Livingston Island emerged as a distinct population, especially compared to King George Island. All populations showed a heterozygote deficit with positive inbreeding coefficients (\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>IS<\/jats:sub>\n                    ), particularly high in the Snow Island population (~0.55). Tajima's\n                    <jats:italic>D<\/jats:italic>\n                    test suggested overall neutral evolution, although slight variation was observed among sites. Despite the limited dispersal potential of this brooding species, the observed connectivity may be maintained through passive dispersal, likely via floating macroalgae or ice\u2010rafted debris, facilitated by prevailing regional ocean currents. This may enhance the population resilience of Antarctic benthic communities under environmental change, including regional warming and shifts in ocean circulation, compared to more isolated populations. Our findings underscore the complex interplay between passive connectivity and fine\u2010scale differentiation in shaping Antarctic benthic invertebrate diversity.\n                  <\/jats:p>","DOI":"10.1002\/ece3.74336","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T03:18:47Z","timestamp":1788923927000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fine\u2010Scale Population Genomics Reveals Genetic Differentiation in the Brooding Amphipod\n                    <i>Cheirimedon femoratus<\/i>\n                    Across the South Shetland Islands, Antarctica"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2666-6743","authenticated-orcid":false,"given":"Euna","family":"Jo","sequence":"first","affiliation":[{"name":"Division of Life Sciences Korea Polar Research Institute  Incheon South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5966-6630","authenticated-orcid":false,"given":"Vahid","family":"Sepahvand","sequence":"additional","affiliation":[{"name":"Department of Marine Science University of Otago  Dunedin New\u00a0Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong\u2010Uk","family":"Ahn","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences and Bioengineering Inha University  Incheon South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0115-9526","authenticated-orcid":false,"given":"Seunghyun","family":"Kang","sequence":"additional","affiliation":[{"name":"Division of Life Sciences Korea Polar Research Institute  Incheon South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Miles","family":"Lamare","sequence":"additional","affiliation":[{"name":"Department of Marine Science University of Otago  Dunedin New\u00a0Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ceridwen","family":"Fraser","sequence":"additional","affiliation":[{"name":"Department of Marine Science University of Otago  Dunedin New\u00a0Zealand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jee\u2010Hoon","family":"Kim","sequence":"additional","affiliation":[{"name":"Division of Ocean &amp; 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