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| Ultsch, G. R., & Anderson, J. F. (1986). The respiratory microenvironment within the burrows of gopher tortoises (gopherus polyphemus). Copeia, 1986, 787–795. |
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| Ultsch, G. R. (2006). The ecology of overwintering among turtles: where turtles overwinter and its consequences. Biological Reviews of the Cambridge Philosophical Society, 81(3), 1–29. |
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| Uva, B. M., & Vallarino, M. (1982). Renin-angiotensin system and osmoregulation in the terrestrial chelonian testudo hermanni gmelin. Comparative Biochemistry and Physiology. A, 71(3), 449–451. |
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| Vallarino, M. (1984). Seasonal kidney and plasma renin concentration in testudo hermanni. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 79(4), 529–532. |
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| Valverde, R. A., Owens, D. W., MacKenzie, D. S., & Amoss, M. S. (1999). Basal and stress-induced corticosterone levels in olive ridley sea turtles (lepidochelys olivacea) in relation to their mass nesting behavior. Journal of Experimental Zoology Part A: Comparative Experimental Biology, 284(6), 652–662. |
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| Van Damme, P. A., & Vree, D. F. (1995). Kinematics of the escape head retraction in the common snake-necked turtle chelodina longicollis (testudines: pleurodira: chelidae). Belgian Journal of Zoology, 125(1), 215–235. |
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| Vasil'ev, B. D., & Smirnov, S. V. (1981). Auditory sensitivity of turtles. Moscow University biological sciences bulletin, 36(4), 9–14. |
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| Vervust, B., Brecko, J., & Herrel, A. (2010). Temperature effects on snapping performance in the common snapper chelydra serpentina (reptilia, testudines). Journal of Experimental Biology A: Ecological Genetics and Physiology, (early view). |
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| Vivien-Roels, B., Arendt, J., & Bradtke, J. (1979). Circadian and circannual fluctuations of pineal indoleamines (serotonin and melatonin) in testudo hermanni gmelin (reptilia, chelonia). General and Comparative Endocrinology, 37, 197–210. |
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| Vivien-Roels, B., Pevet, P., & Claustrat, B. (1988). Pineal and circulating melatonion rhythms in the box turtle, terrapene carolina triunguis: effect of photoperiod, light pulse, and environmental temperature. General and Comparative Endocrinology, 69, 163–173. |
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| Voigt, W. G. (1975). Heating and cooling rates and their effects upon heart rate and subcutaneous temperatures in the desert tortoise, gopherus agassizii. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 52(3), 527–531. |
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| Voigt, W. G., & Johnson, C. R. (1977). Physiological control of heat exchange rates in the texas tortoise, gopherus berlandieri. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 56(4), 495–498. |
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