Abstract
Abstract Lack of food is one of the most common natural stressors that animals face, yet the physiological response to food restriction in most nonmammalian species is poorly understood. Food restriction can elicit an elevation of plasma glucocorticoid hormones and changes in blood metabolites in several vertebrates, but this has not been shown in snakes, despite their remarkable ability to tolerate food shortages. The purpose of this study was to determine the physiological response to moderate food deprivation in Common Watersnakes (Nerodia sipedon). When food was withheld for 15 d, snakes lost body mass, had elevated baseline plasma corticosterone concentrations, lower hematocrit, and depressed levels of triglycerides and uric acid. Food deprivation had no effect on blood glucose or lactate. Elevation of corticosterone levels could help snakes mobilize stored energy to allow them to survive periods of restricted feeding. Depressed triglycerides likely indicate increased utilization of lipid stores. Bec...
Published Version
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