Acute and chronic temperature effects on cardiovascular regulation in the red-eared slider (Trachemys scripta)

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Dane A CrossleyJ W Hicks

Abstract

Acute and chronic changes in ambient temperature alter several aspects of reptilian physiology. We investigated the effects of each type of temperature change on reptilian cardiovascular regulation in red-eared slider turtles (Trachemys scripta), a species known to experience marked seasonal changes in ambient temperature. Turtles were instrumented with occlusive catheters in the femoral artery and vein. Following an acclimation period of 10 days at 13 °C (13(1)), cardiovascular responses to adrenaline, and the cardiac limb of the baroreflex were quantified. Ambient temperature was then reduced 1 °C day(-1) until 3 °C was reached (3(1)). Turtles were maintained at this temperature for 1-week before cardiovascular responses were reassessed. Turtles were then gradually (1 °C day(-1)) returned to an ambient temperature of 13 °C, (13(2)). After a 1-week re-acclimation period, cardiovascular responses were again determined. Finally, 1-week post-pharmacological manipulation of turtles in the 13(2) treatment, ambient temperature was reduced to 3 °C over 24 h (3(2)), and cardiovascular responses were again assessed. Temperature reduction from 13(1) to 3(1) decreased mean arterial blood pressure (P(m)) and heart rate (f(H)) by ~38 and ~...Continue Reading

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Citations

Aug 13, 2015·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Colin E SandersWilliam K Milsom
Apr 17, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jonathan A W StecykAnthony P Farrell
Jan 31, 2018·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Derek NelsonKevin B Tate
Jun 11, 2019·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Renato FilogonioCléo A C Leite
Apr 22, 2016·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Adam N KeenDane A Crossley

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