High resting metabolic rates with low thermal dependence induce active dives in overwintering Pacific juvenile loggerhead turtles

The Journal of Experimental Biology
Chihiro KinoshitaKatsufumi Sato

Abstract

The metabolic rate and activity of sea turtles generally decreases with decreasing seasonal ambient temperature. Juvenile loggerhead turtles in the Mediterranean Sea made prolonged inactive dives (>400 min), indicating a state of dormancy during the cold winter period. However, seasonal differences in dive duration were not detected in juvenile loggerheads in the western North Pacific, even though the ambient water temperature changed by more than 10°C. Thus, metabolic states might differ among populations, explaining differences in the diving behaviour of juveniles during winter. Here, we tested the hypothesis that the active overwintering behaviour of juvenile loggerheads in the western North Pacific is driven by a high resting metabolic rate (RMR) with low thermal dependence. The RMR of juveniles in the western North Pacific (N=13) was 1.4-5.7 times higher (Q10=1.8) than that of juveniles in the Mediterranean Sea (Q10=5.4). To validate the high RMR values in the western North Pacific, the difference between core body temperature and ambient water temperature (ΔTb) was estimated from measured RMR and was compared with measured ΔTb The measured and estimated ΔTb matched each other. In addition, most of the dives conducted by t...Continue Reading

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Nov 11, 2011·The Journal of Experimental Biology·Manfred R EnstippJean-Yves Georges
Aug 26, 2014·The Journal of Experimental Biology·Katsufumi Sato

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Citations

Apr 3, 2019·The Journal of Experimental Biology·Cassondra L WilliamsPaul J Ponganis
Oct 17, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·B Gabriela ArangoDaniel E Crocker
Jan 14, 2021·The Journal of Experimental Biology·Chihiro KinoshitaKatsufumi Sato

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