期刊
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
卷 303, 期 2, 页码 243-260出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jembe.2003.11.010
关键词
buoyancy; dive; descent; ascent; Chelonia mydas; TDP; IMASU; penguin; seal
资金
- Natural Environment Research Council [NER/A/S/2003/00302] Funding Source: researchfish
Depth and flipper movements were simultaneously measured during 23 dives for a free-swimming green turtle (Chelonia mydas) at Ascension Island. A few characteristic dive profiles that have been widely reported in hard-shelled turtles were recorded. Flipper movements revealed that, on dives to midwater, there was generally active swimming, compared to long periods of inactivity on dives to the seafloor. During all dives, there were clear changes in the flipper beat frequency during the descent. On leaving the surface, flippers beats occurred quickly (typically 30-40 beats min(-1)) and then as the descent continued the frequency declined (typically to about 10-14 beats min(-1)). These observations match the general pattern reported for other air-breathing divers for increased effort at the start of the descent to overcome initial positive buoyancy. (C) 2004 Elsevier B.V. All rights reserved.
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