{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,5]],"date-time":"2025-10-05T20:00:57Z","timestamp":1759694457787,"version":"3.37.3"},"reference-count":45,"publisher":"The Company of Biologists","issue":"4","license":[{"start":{"date-parts":[[2020,9,3]],"date-time":"2020-09-03T00:00:00Z","timestamp":1599091200000},"content-version":"vor","delay-in-days":1639,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0"}],"funder":[{"DOI":"10.13039\/501100001711","name":"National Science Foundation","doi-asserted-by":"publisher","award":["1146758"],"award-info":[{"award-number":["1146758"]}],"id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2016,4,15]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>The ontogeny of endothermy in birds is associated with disproportionate growth of thermogenic organs and increased mitochondrial oxidative capacity. However, no similar study has been made of the development of these traits in ectotherms. For comparison, we therefore investigated the metabolism, growth and muscle mitochondrial function in hatchlings of a turtle and a crocodilian, two ectotherms that never develop endothermy. Metabolic rate did not increase substantially in either species by 30\u2005days post-hatching. Yolk-free body mass and heart mass did not change through 30\u2005days in alligators and heart mass was a constant proportion of body mass, even after 1\u2005year. Yolk-free body mass and liver mass grew 36% and 27%, respectively, in turtles during the first 30\u2005days post-hatch. The mass-specific oxidative phosphorylation capacity of mitochondria, assessed using permeabilized muscle fibers, increased by a non-significant 47% in alligator thigh and a non-significant 50% in turtle thigh over 30\u2005days, but did not increase in the heart. This developmental trajectory of mitochondrial function is slower and shallower than that previously observed in ducks, which demonstrate a 90% increase in mass-specific oxidative phosphorylation capacity in thigh muscles over just a few days, a 60% increase in mass-specific oxidative phosphorylation capacity of the heart over a few days, and disproportionate growth of the heart and other organs. Our data thus support the hypothesis that these developmental changes in ducks represent mechanistic drivers for attaining endothermy.<\/jats:p>","DOI":"10.1242\/bio.017160","type":"journal-article","created":{"date-parts":[[2016,3,10]],"date-time":"2016-03-10T03:59:30Z","timestamp":1457582370000},"page":"443-451","source":"Crossref","is-referenced-by-count":16,"title":["Post-hatching development of mitochondrial function, organ mass and metabolic rate in two ectotherms, the American alligator (<i>Alligator mississippiensis<\/i>) and the common snapping turtle (<i>Chelydra serpentina<\/i>)"],"prefix":"10.1242","volume":"5","author":[{"given":"Sarah K. 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