University of Worcester Worcester Research and Publications

Metabolism and Thermoregulation in the Springhare (Pedetes capensis).

Brown, Chris and Peinke, D.M. (2003) Metabolism and Thermoregulation in the Springhare (Pedetes capensis). Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 173 (4). pp. 347-353. ISSN 0174-1578

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Springhares are large, nocturnally active, diurnally fossorial rodents that typically inhabit arid and semi-arid areas. This lifestyle means that they need to balance excessive heat loss when foraging at night against insufficient heat loss in a potentially warm, humid burrow and both of these against the need to minimize water turnover and energy requirements. In this study we investigated metabolism and thermoregulation in these animals. Basal metabolic rate averaged 8.62±1.37 J g -1 h -1 and minimum thermal conductance 0.386±0.062 J g -1 h -1 °C -1. These were higher and lower than expected, respectively. This, along with a relatively low, lower critical temperature and broad thermal neutral zone indicate that springhares are physiologically well suited to the low night-time temperatures, which they typically encounter. Body temperatures were quite labile but springhares became hyperthermic at temperatures above 30 °C suggesting that they are poor thermoregulators at high temperatures. This is attributed to their seldom, if ever, encountering temperatures in this range. Insufficient heat loss under normal resting conditions does not appear to be a problem, as springhares inhabit deep burrows in which the temperature never exceeds the upper critical temperature. Excess heat generated during vigorous underground exercise is presumably stored and dissipated to the cool night air or the cooler soil when subsequently resting. Water turnover and energy expenditure are presumably adequately addressed by other physiological and behavioural characteristics.

Item Type: Article
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Uncontrolled Discrete Keywords: springhares, metabolism, thermoregulation, burrow microclimate, SERG
Subjects: Q Science > QL Zoology
Q Science > QH Natural history > QH301 Biology
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
Depositing User: Chris Brown
Date Deposited: 25 May 2010 08:12
Last Modified: 31 Jul 2020 14:00

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