Journal Title
Title of Journal: J Comp Physiol B
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Abbravation: Journal of Comparative Physiology B
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Publisher
Springer-Verlag
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Authors: Shane K Maloney Andrea Fuller Leith C R Meyer Peter R Kamerman Graham Mitchell Duncan Mitchell
Publish Date: 2008/09/27
Volume: 179, Issue: 3, Pages: 241-251
Abstract
Marsupials reportedly can implement selective brain cooling despite lacking a carotid rete We measured brain hypothalamic and carotid arterial blood temperatures every 5 min for 5 17 and 63 days in spring in three freeliving western grey kangaroos Body temperature was highest during the night and decreased rapidly early in the morning reaching a nadir at 1000 The highest body temperatures recorded occurred sporadically in the afternoon presumably associated with exercise Hypothalamic temperature consistently exceeded arterial blood temperature by an average 03°C except during these afternoon events when hypothalamic temperature lagged behind and was occasionally lower than the simultaneous arterial blood temperature The reversal in temperatures resulted from the thermal inertia of the brain changes in the brain to arterial blood temperature difference were related to the rate of change of arterial blood temperature on both heating and cooling P 0001 for all three kangaroos We conclude that these data are not evidence for active selective brain cooling in kangaroos The effect of thermal inertia on brain temperature is larger than might be expected in the grey kangaroo a discrepancy that we speculate derives from the unique vascular anatomy of the marsupial brainThis research was supported by an Australian Research Council Discovery grant to S·KM and DM by the office of the ViceChancellor Research at UWA and by the South African National Research Foundation We thank the Harry Waring Reserve management committee for providing permission to use the reserve and Mr Bob Cooper the warden of the Reserve for his generous help with logistics and animal monitoring The Department of Conservation and Land Management Western Australia approved the use of native fauna in this project Professor Graeme Martin and the School of Animal Biology UWA allowed us to use their 4WD vehicle
Keywords:
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