{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T19:01:00Z","timestamp":1790881260393,"version":"4.1.0"},"reference-count":40,"publisher":"The Royal Society","issue":"11","license":[{"start":{"date-parts":[[2024,11,1]],"date-time":"2024-11-01T00:00:00Z","timestamp":1730419200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2024,11,1]],"date-time":"2024-11-01T00:00:00Z","timestamp":1730419200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Greenland Research Counsel"},{"name":"Independent Research Fund Denmark"},{"DOI":"10.13039\/501100009708","name":"Novo Nordisk Foundation","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100009708","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100004785","name":"NordForsk","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100004785","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["royalsocietypublishing.org"],"crossmark-restriction":true},"short-container-title":["Biol. Lett."],"published-print":{"date-parts":[[2024,11]]},"abstract":"<jats:p>\n                    The tusk of the male narwhal is a prolonged canine tooth, reaching a size of up to 3 m in length. The tusk erupts through the young narwhal\u2019s upper left lip and, over time, develops into an elongated structure composed of dentine growth layers with an outer coating of cementum. In this study, we utilized bomb radiocarbon (\n                    <jats:sup>14<\/jats:sup>\n                    C) to estimate the ages of three narwhal tusks, which allowed us to validate the assumption that one growth layer is deposited annually in narwhal tusks. We used radiocarbon values from samples collected from the annual growth layers along the lengths of the erupted tusks and from the tip and base of embedded teeth, together with published radiocarbon data from three North Atlantic whale species, for the purpose of building a model of the incorporation of bomb radiocarbon in marine mammal tissues. The results obtained contribute significantly to our understanding of narwhal growth and longevity, enhancing our comprehension of isotope flow in the Arctic marine environment and their incorporation into the living tissue of a marine top predator. The bomb radiocarbon model can serve as a valuable reference chronology for dating museum or field specimens of narwhals and other North Atlantic marine animals.\n                  <\/jats:p>","DOI":"10.1098\/rsbl.2024.0350","type":"journal-article","created":{"date-parts":[[2024,11,26]],"date-time":"2024-11-26T19:06:20Z","timestamp":1732647980000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":7,"title":["A radiocarbon bomb pulse model for estimating the age of North Atlantic cetaceans"],"prefix":"10.1098","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3016-5722","authenticated-orcid":true,"given":"Eva","family":"Garde","sequence":"first","affiliation":[{"name":"Greenland Institute of Natural Resources (GINR), Greenland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1998-2783","authenticated-orcid":true,"given":"Susanne","family":"Ditlevsen","sequence":"additional","affiliation":[{"name":"Department of Mathematical Sciences, University of Copenhagen, Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4445-5520","authenticated-orcid":true,"given":"Jesper","family":"Olsen","sequence":"additional","affiliation":[{"name":"Department of Physics and Astronomy, Aarhus AMS Centre (AARAMS), Aarhus University, Aarhus, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4846-7622","authenticated-orcid":true,"given":"Mads Peter","family":"Heide-J\u00f8rgensen","sequence":"additional","affiliation":[{"name":"Greenland Institute of Natural Resources (GINR), Greenland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2024,11,27]]},"reference":[{"key":"e_1_3_8_2_2","doi-asserted-by":"publisher","DOI":"10.1093\/jmammal\/gyac085"},{"key":"e_1_3_8_3_2","first-page":"mfr813","article-title":"Meta-population modeling of narwhals, Monodon monoceros, in East Canada and West Greenland","author":"Witting L","year":"2019","unstructured":"Witting L, Doniol-Valcroze T, Hobbs RC, Ditlevsen S, Heide-J\u00f8rgensen MP. 2019 Meta-population modeling of narwhals, Monodon monoceros, in East Canada and West Greenland. 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