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Southern Hemisphere fin whale (Balaenoptera physalus) songs include region-specific high-frequency components, with the 86- and 99-Hz high-frequency components present in the Atlantic Sector of the Southern Ocean. Using long-term passive acoustic monitoring data, we show that, despite gradual interannual and intra-annual variabilities, these features remain distinct and recognizable across regions and years. Our findings support their use as reliable acoustic markers for monitoring fin whale populations, providing valuable insights into distribution and population structure.<\/jats:p>","DOI":"10.1121\/10.0039500","type":"journal-article","created":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T13:36:12Z","timestamp":1759844172000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["Shifts in acoustic signature of Southern Hemisphere fin whales: Declining peak frequency of high-frequency components"],"prefix":"10.1121","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8803-4162","authenticated-orcid":false,"given":"Svenja","family":"W\u00f6hle","sequence":"first","affiliation":[{"name":"Alfred Wegener Institute for Polar and Marine Research 1 , Klu\u00dfmannstra\u00dfe 3d, 27570 Bremerhaven,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-8499-7729","authenticated-orcid":false,"given":"Laura","family":"Paker","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute for Polar and Marine Research 1 , Klu\u00dfmannstra\u00dfe 3d, 27570 Bremerhaven,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5128-4176","authenticated-orcid":false,"given":"Elke","family":"Burkhardt","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute for Polar and Marine Research 1 , Klu\u00dfmannstra\u00dfe 3d, 27570 Bremerhaven,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8369-7234","authenticated-orcid":false,"given":"Ilse","family":"Van Opzeeland","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute for Polar and Marine Research 1 , Klu\u00dfmannstra\u00dfe 3d, 27570 Bremerhaven,","place":["Germany"]},{"name":"Helmholtz Institute for Functional Marine Biodiversity, Carl von Ossietzky University Oldenburg 2 , Ammerl\u00e4nder Heerstra\u00dfe 231, 26129 Oldenburg, svenja.woehle@awi.de , lpaker@uni-bremen.de , elke.burkhardt@awi.de , ilse.van.opzeeland@awi.de , elena.schall@awi.de","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7740-5466","authenticated-orcid":false,"given":"Elena","family":"Schall","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute for Polar and Marine Research 1 , Klu\u00dfmannstra\u00dfe 3d, 27570 Bremerhaven,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2025,10,7]]},"reference":[{"key":"2025111014365547600_c1","doi-asserted-by":"publisher","first-page":"20182088","DOI":"10.1098\/rspb.2018.2088","article-title":"Cultural revolutions reduce complexity in the songs of humpback whales","volume":"285","year":"2018","journal-title":"Proc. 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