{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T18:07:59Z","timestamp":1788804479476,"version":"build-2803163510"},"reference-count":34,"publisher":"The Company of Biologists","issue":"17","license":[{"start":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T00:00:00Z","timestamp":1788739200000},"content-version":"vor","delay-in-days":6,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100009708","name":"Novo Nordisk Fonden","doi-asserted-by":"crossref","award":["NNF20OC0062958"],"award-info":[{"award-number":["NNF20OC0062958"]}],"id":[{"id":"10.13039\/501100009708","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Carlsbergfondet","award":["CF14-0169"],"award-info":[{"award-number":["CF14-0169"]}]},{"name":"Danish Cooperation for Environment in the Arctic","award":["2013_01_0289"],"award-info":[{"award-number":["2013_01_0289"]}]},{"name":"Northeast Greenland Environmental Study Program"},{"DOI":"10.13039\/100031398","name":"Nationalt Center for Milj\u00f8 og Energi, Aarhus Universitet","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100031398","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100008075","name":"Pinngortitaleriffik","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100008075","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Environmental Agency for Mineral Resource Activities of the Government of Greenland"},{"DOI":"10.13039\/100008075","name":"Greenland Institute of Natural Resources","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100008075","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Overall dynamic body acceleration (ODBA) is widely used as a proxy for movement activity. However, for large, slow-moving animals such as cetaceans, ODBA is dominated by orientational shifts rather than dynamic movements. We argue for using stroke rate frequency as an alternative to ODBA and present a method for estimating stroke rate from acceleration data, using narwhals as a case study. The resulting stroke rates aligned with diving phases and depths, where gliding is expected to be prevalent. The results were also competitive with state-of-the-art magnetometer-assisted approaches. The method also successfully detected individual strokes during a 30\u00a0s video of narwhal surface swimming. Using combined surge and heave acceleration produced better stroke estimates than using either in isolation. Our findings demonstrate that accelerometer-based tail stroke frequency is a valid proxy for activity level in marine mammals and highlight the importance of correcting for orientational effects.<\/jats:p>","DOI":"10.1242\/jeb.252217","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T07:00:42Z","timestamp":1788764442000},"source":"Crossref","is-referenced-by-count":1,"title":["Stroke rate detection from accelerometer data on marine mammals"],"prefix":"10.1242","volume":"229","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8910-0344","authenticated-orcid":false,"given":"Frederik H.","family":"Jensen","sequence":"first","affiliation":[{"name":"University of Copenhagen 1 Data Science Laboratory, Department of Mathematical Sciences , , Universitetsparken 5, DK-2100 Copenhagen ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1064-7089","authenticated-orcid":false,"given":"Outi M.","family":"Tervo","sequence":"additional","affiliation":[{"name":"Greenland Institute of Natural Resources 2 Department of Mammals and Birds , , 3900 Nuuk ,","place":["Greenland"]},{"name":"Greenland Institute of Natural Resources 3 , Strandgade 91,2, DK-1401 Copenhagen K ,","place":["Denmark"]},{"name":"Technical University of Denmark, National Institute of Aquatic Resources, Section for Ecosystem-based Marine Management 4 , Henrik Dams All\u00e9, Building 201, 2800 Kgs. Lyngby ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4846-7622","authenticated-orcid":false,"given":"Mads Peter","family":"Heide-J\u00f8rgensen","sequence":"additional","affiliation":[{"name":"Greenland Institute of Natural Resources 2 Department of Mammals and Birds , , 3900 Nuuk ,","place":["Greenland"]},{"name":"Greenland Institute of Natural Resources 3 , Strandgade 91,2, DK-1401 Copenhagen K ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1998-2783","authenticated-orcid":false,"given":"Susanne","family":"Ditlevsen","sequence":"additional","affiliation":[{"name":"University of Copenhagen 1 Data Science Laboratory, Department of Mathematical Sciences , , Universitetsparken 5, DK-2100 Copenhagen ,","place":["Denmark"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2026,9,7]]},"reference":[{"key":"2026090704064114600_JEB252217C1","doi-asserted-by":"publisher","first-page":"e0198295","DOI":"10.1371\/journal.pone.0198295","article-title":"Spatial and temporal patterns of sound production in East Greenland narwhals","volume":"13","author":"Blackwell","year":"2018","journal-title":"PLoS ONE"},{"key":"2026090704064114600_JEB252217C2","doi-asserted-by":"publisher","first-page":"20","DOI":"10.1186\/2050-3385-1-20","article-title":"Observing the unwatchable through acceleration logging of animal behavior","volume":"1","author":"Brown","year":"2013","journal-title":"Anim. 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