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For ectothermic marine turtles, temperature profoundly affects their metabolism, overall physiology, behaviour and distribution. Marine turtles are globally threatened and a detailed understanding of their energy requirements is essential to comprehend their role in marine ecosystems and to guide conservation efforts. We used flow-through respirometry to study the effects of seasonal changes in water temperature (Tw) on the resting oxygen consumption rates (V\u0307O2) of three sea turtle species (green, loggerhead and hawksbill turtles). Tw changes between winter and summer (maximum range: 20.3\u201331.9\u00b0C) had a clear effect on mass-specific V\u0307O2\u00a0(sV\u0307O2) that increased on average by \u223c50% across species in summer. Hence, the thermal sensitivity of metabolism was similar in all species with Q10 values ranging between 2.1 and 2.7, typical for reptiles. Changes in sV\u0307O2\u00a0were paralleled by changes in respiratory frequency (fR) in all species. In separate trials with loggerhead turtles resting and swimming in a tank, we recorded body acceleration (PDBA) together with V\u0307O2\u00a0to investigate the effects of activity on metabolism and to establish a predictive equation that can be used to estimate turtle energy expenditure at sea from the recording of body acceleration. Moderate swimming activity increased sV\u0307O2\u00a0up to 3.2 times over resting. We found a significant positive relationship between sV\u0307O2\u00a0and PDBA (r2=0.63, P&amp;lt;0.0001) with small associated error estimates, indicating that body acceleration is a good predictor of V\u0307O2\u00a0in loggerhead turtles, similar to what has previously been reported for green turtles.<\/jats:p>","DOI":"10.1242\/jeb.250844","type":"journal-article","created":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T07:01:47Z","timestamp":1759734107000},"source":"Crossref","is-referenced-by-count":1,"title":["The thermal dependence of metabolism in three sea turtle species and the effects of activity"],"prefix":"10.1242","volume":"228","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5080-626X","authenticated-orcid":false,"given":"Manfred R.","family":"Enstipp","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR 7178 1 , F-67000 Strasbourg ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3565-1191","authenticated-orcid":false,"given":"Virginie","family":"Plot","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR 7178 1 , F-67000 Strasbourg ,","place":["France"]},{"name":"Groupe Local d'Observation des C\u00e9tac\u00e9s (GLOBICE) R\u00e9union 2 , 97411 Saint Paul, La R\u00e9union ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7284-8682","authenticated-orcid":false,"given":"St\u00e9phane","family":"Ciccione","sequence":"additional","affiliation":[{"name":"K\u00e9lonia, l'observatoire des tortues marines, BP 40 3 , 97436 Saint Leu, La R\u00e9union ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-3265-2932","authenticated-orcid":false,"given":"Katia","family":"Ballorain","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR 7178 1 , F-67000 Strasbourg ,","place":["France"]},{"name":"Centre d\u2019\u00c9tude et de D\u00e9couverte des Tortues Marines 4 , 97424 Piton Saint Leu, La R\u00e9union ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1161-2275","authenticated-orcid":false,"given":"Jean-Yves","family":"Georges","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR 7178 1 , F-67000 Strasbourg ,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2025,7,22]]},"reference":[{"key":"2025100603014172700_JEB250844C1","doi-asserted-by":"publisher","first-page":"169","DOI":"10.1007\/s00227-023-04316-y","article-title":"Diet of loggerhead turtles in the Gulf of Manfredonia, South Adriatic Sea: evidence of winter feeding and anthropogenic impacts","volume":"170","author":"Baldi","year":"2023","journal-title":"Mar. 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