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Variability in brain and arterial blood temperatures in free-ranging ostriches in their natural habitat

Andrea Fuller^1,*, Peter R. Kamerman¹, Shane K. Maloney^1,2, Graham Mitchell¹ and Duncan Mitchell¹

¹ School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
² Department of Physiology, School of Biomedical and Chemical Science, University of Western Australia, Crawley 6009, Perth, Australia

View larger version (18K): [in a new window]   Fig. 1. Brain and carotid blood temperatures, as a function of time of day, for ostrich 1 over a period of 8 days. Values are means ± S.D. (shown at 1 h intervals) of 5 min readings.

View larger version (14K): [in a new window]   Fig. 2. Original records of brain and carotid blood temperatures taken at 5 min intervals from two ostriches (ostrich 1, A; ostrich 3, B) over a 2 h period on the same day.

View larger version (21K): [in a new window]   Fig. 3. Original records of brain and carotid blood temperatures taken at 5 min intervals from ostrich 1 over 1 day.

View larger version (30K): [in a new window]   Fig. 4. Brain temperature as a function of carotid blood temperature (Ai–Di), and frequency distribution of blood temperature (Aii–Dii), in four ostriches. The 5 min values of blood temperature were sorted into classes of 0.1°C width. Values in Ai–Di are means ± S.D. and minima and maxima of brain temperature at each class of blood temperature. Aii–Dii show absolute frequencies at which each class of blood temperature occurred; N=2304 data points for ostrich 1 (A), 1728 for ostrich 3 (B), 1440 for ostrich 5 (C) and 4032 for ostrich 4 (D). The lines of identity of brain and blood temperatures are shown in Ai–Di.

View larger version (22K): [in a new window]   Fig. 5. Abdominal and carotid blood temperatures, as a function of time of day, for two ostriches over 5 days (ostrich 5, A) or 8 days (ostrich 6, B). Values are means ± S.D. (shown at 1 h intervals) of 5 min readings.