Heat storage in running antelopes: independence of brain and body temperatures

Taylor, Curtis R.; Lyman, Charles P.

doi:10.1152/ajplegacy.1972.222.1.114

Cited by 157 publications

(69 citation statements)

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“…Whether the apparent enhanced capacity for selective brain cooling in the Arabian oryx reflects differences in the physiology or the anatomy of the carotid rete heat exchanger remains to be elucidated. Even though the magnitude of selective brain cooling in our oryx was much less than the 2.7°C originally reported for the exercising captive Thomson's gazelle (Taylor and Lyman, 1972), it was double the magnitude that substantially reduced both the respiratory water loss (Kuhnen, 1997) and the metabolic cost of thermoregulation (Kuhnen and Jessen, 1991) in goats.…”

Section: Discussioncontrasting

confidence: 63%

Selective brain cooling in Arabian oryx (Oryx leucoryx): a physiological mechanism for coping with aridity?

Hetem

Strauss

Fick

et al. 2012

Journal of Experimental Biology

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SUMMARYSelective brain cooling is a thermoregulatory effector proposed to conserve body water and, as such, may help artiodactyls cope with aridity. We measured brain and carotid blood temperature, using implanted data loggers, in five Arabian oryx (Oryx leucoryx) in the desert of Saudi Arabia. On average, brain temperature was 0.24±0.05°C lower than carotid blood temperature for four oryx in April. Selective brain cooling was enhanced in our Arabian oryx compared with another species from the same genus (gemsbok Oryx gazella gazella) exposed to similar ambient temperatures but less aridity. Arabian oryx displayed a lower threshold (37.8±0.1°C vs 39.8±0.4°C), a higher frequency (87±6% vs 15±15%) and a higher maximum magnitude (1.2±0.2°C vs 0.5±0.3°C) of selective brain cooling than did gemsbok. The dominant male oryx displayed less selective brain cooling than did any of the other oryx, but selective brain cooling was enhanced in this oryx as conditions became hotter and drier. Enhanced selective brain cooling in Arabian oryx supports the hypothesis that selective brain cooling would bestow survival advantages for artiodactyl species inhabiting hot hyper-arid environments.

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Section: Discussioncontrasting

confidence: 63%

Selective brain cooling in Arabian oryx (Oryx leucoryx): a physiological mechanism for coping with aridity?

Hetem

Strauss

Fick

et al. 2012

Journal of Experimental Biology

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“…The abdominal temperature increases more readily than the brain temperature, especially in those species that possess mechanisms for selective brain cooling. For example, an abdominal temperature of Ͼ47°C was recorded in a running gazelle (Taylor and Lyman, 1972). Perhaps DRG that express TRPV1 channels and project (polysynaptically) to the neural pathways that control thermoeffectors (Fig.…”

Section: Physiological and Pathological Significancementioning

confidence: 99%

The Transient Receptor Potential Vanilloid-1 Channel in Thermoregulation: A Thermosensor It Is Not

et al. 2009

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“…Heat exchange between the rete carrying warm blood to the brain and the cool venous blood reduces arterial blood temperature and produces SBC. In the years following the discovery of SBC (Baker and Hayward, 1968) it was assumed that its biological purpose was to protect the brain from thermal damage when body temperatures increased, for example during exercise (Taylor and Lyman, 1972). This function for the rete was, however, dispelled by studies done mostly in southern hemisphere animals exposed to hot and arid conditions (Mitchell et al, 2002), but also in reindeer in the northern hemisphere (Aas-Hansen et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Thermoregulation in pronghorn antelope (Antilocapra americana,Ord) in winter

Hébert

Lust

Fuller

et al. 2008

Journal of Experimental Biology

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SUMMARYConservation of energy is a prerequisite thermoregulatory strategy for survival in northern hemisphere winters. We have used thermistor/data logger assemblies to measure temperatures in the brain, carotid artery, jugular vein and abdominal cavity, in pronghorn antelope to determine their winter body temperature and to investigate whether the carotid rete has a survival role. Over the study period mean black globe and air temperature were -0.5±3.2°C and -2.0±3.4°C, respectively, and mean daytime solar radiation was ~186·W·m -2 . Brain temperature (T brain , 39.3±0.3°C) was higher than carotid blood temperature (T carotid , 38.5±0.4°C), and higher than jugular temperature (T jugular , 37.9±0.7°C). Minimum T brain (38.5±0.4°C) and T carotid (37.8±0.2°C) in winter were higher than the minimum T brain (37.7±0.5°C) and T carotid (36.4±0.8°C) in summer that we have reported previously. Compared with summer, winter body temperature patterns were characterized by an absence of selective brain cooling (SBC), a higher range of T brain , a range of T carotid that was significantly narrower (1.8°C) than in summer (3.1°C), and changes in T carotid and T brain that were more highly correlated (r=0.99 in winter vs r=0.83 in summer). These findings suggest that in winter the effects of the carotid rete are reduced, which eliminates SBC and prevents independent regulation of T brain , thus coupling T brain to T carotid . The net effect is that T carotid varies little. A possible consequence is depression of metabolism, with the survival advantage of conservation of energy. These findings also suggest that the carotid rete has wider thermoregulatory effects than its traditional SBC function.

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Heat storage in running antelopes: independence of brain and body temperatures

Cited by 157 publications

References 0 publications

Selective brain cooling in Arabian oryx (Oryx leucoryx): a physiological mechanism for coping with aridity?

Selective brain cooling in Arabian oryx (Oryx leucoryx): a physiological mechanism for coping with aridity?

The Transient Receptor Potential Vanilloid-1 Channel in Thermoregulation: A Thermosensor It Is Not

Thermoregulation in pronghorn antelope (Antilocapra americana,Ord) in winter

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