Physiological and hormonal control of thermal depression in the tiger snake, Notechis scutatus

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
Mitchell LadymanFelicity Bradshaw

Abstract

Plasma sodium concentrations in field-caught Western tiger snakes, Notechis scutatus, from semi-arid Carnac Island (CI) varied seasonally, with snakes exhibiting significant hypernatraemia during summer and normal concentrations following autumn rain. In contrast, field-caught tiger snakes from a perennial fresh-water swamp (Herdsman Lake, HL) exhibited no significant increase in plasma sodium concentrations during summer. Laboratory-induced hypernatraemia caused thermal depression in both populations; there was a weak negative relationship between plasma sodium concentration and temperature selection that was significant for CI snakes. Hypernatraemia significantly elevated circulating concentrations of the neuropeptide arginine vasotocin (AVT) in both CI and HL snakes. CI snakes injected with a physiological dosage of AVT also evidenced thermal depression. Despite the positive correlation between AVT and both plasma sodium concentration and osmolality for laboratory snakes, field samples from CI snakes indicate that circulating levels of AVT may be influenced more by plasma osmolality than sodium levels. The data suggest that, in CI snakes, chronic dehydration in the field leads to hypernatraemia which may lead to elevated lev...Continue Reading

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Citations

Aug 19, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Leonardo Zambotti-VillelaPaulo Flavio Silveira
Nov 16, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Andréaz DupouéFrançois Brischoux
Feb 24, 2007·General and Comparative Endocrinology·Don Bradshaw
Oct 10, 2015·General and Comparative Endocrinology·Christine Elizabeth Cooper
Sep 5, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kênia C BicegoLuiz G S Branco
May 4, 2021·Integrative and Comparative Biology·Stephanie M Campos, Selma S Belkasim

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