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Quantifying this cost is essential for bioenergetic models that predict energy flow and prey requirements in populations. Using breath-by-breath respirometry, we measured oxygen consumption (V\u0307O2) in eight common bottlenose dolphins (Tursiops truncatus) before and after feeding standardized meals (1659\u20132658 kcal of capelin and herring). Metabolic rate rose by \u223c37% above resting levels, peaking 60\u2005min after feeding before returning to baseline within 2\u00a0h. When scaled across the day, digestion increased daily metabolic needs by \u223c8.2% of basal metabolism, similar to values reported for Steller sea lions (Eumetopias jubatus) and harbour seals (Phoca vitulina), where HIF contributes 4\u201310% of daily energy expenditure. This study provides the first multi-individual estimate of HIF in dolphins and suggests that the energetic cost of digestion is a moderate contribution to overall daily metabolism, refining energetic models and improving prey requirement estimates for cetaceans in the wild.<\/jats:p>","DOI":"10.1242\/jeb.251474","type":"journal-article","created":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T09:08:00Z","timestamp":1762247280000},"source":"Crossref","is-referenced-by-count":3,"title":["Heat increment of feeding in the common bottlenose dolphin (\n                    <i>Tursiops truncatus<\/i>\n                    ) contributes moderately to field metabolic rate estimates"],"prefix":"10.1242","volume":"228","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-8016-5068","authenticated-orcid":false,"given":"Ioulia","family":"Koliopoulou","sequence":"first","affiliation":[{"name":"IFM, Link\u00f6ping University 1 , 581 83 Link\u00f6ping ,","place":["Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0571-0306","authenticated-orcid":false,"given":"Stacy L.","family":"DeRuiter","sequence":"additional","affiliation":[{"name":"Calvin University 2 Department of Mathematics and Statistics , , Grand Rapids, MI 49546 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7362-1084","authenticated-orcid":false,"given":"Jordi","family":"Altimiras","sequence":"additional","affiliation":[{"name":"IFM, Link\u00f6ping University 1 , 581 83 Link\u00f6ping ,","place":["Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Josefin","family":"Larsson","sequence":"additional","affiliation":[{"name":"Kolm\u00e5rden Wildlife Park 3 , 618 92 Kolm\u00e5rden ,","place":["Sweden"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julietta","family":"Arenarez","sequence":"additional","affiliation":[{"name":"Fundaci\u00f3n Oceanogr\u00e0fic 4 , 46013 Val\u00e8ncia ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2931-9608","authenticated-orcid":false,"given":"David","family":"Rosen","sequence":"additional","affiliation":[{"name":"University of British Columbia 5 Institute for the Oceans and Fisheries , , Vancouver, BC , , V6T 1Z4","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8675-6479","authenticated-orcid":false,"given":"Andreas","family":"Fahlman","sequence":"additional","affiliation":[{"name":"IFM, Link\u00f6ping University 1 , 581 83 Link\u00f6ping ,","place":["Sweden"]},{"name":"Fundaci\u00f3n Oceanogr\u00e0fic 4 , 46013 Val\u00e8ncia ,","place":["Spain"]},{"name":"Global Diving Research SL 6 , 46004 Valencia ,","place":["Spain"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2025,12,12]]},"reference":[{"key":"2025121205423398900_JEB251474C1","doi-asserted-by":"publisher","first-page":"jeb243121","DOI":"10.1242\/jeb.243121","article-title":"Dynamic body acceleration as a proxy to predict the cost of locomotion in bottlenose dolphins","volume":"225","author":"Allen","year":"2022","journal-title":"J. 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