Absence of Selective Brain Cooling in Free-Ranging Zebras in Their Natural Habitat

2000 ◽  
Vol 85 (2) ◽  
pp. 209-217 ◽  
Author(s):  
Andrea Fuller ◽  
Shane K. Maloney ◽  
Peter R. Kamerman ◽  
Graham Mitchell ◽  
Duncan Mitchell
Keyword(s):  
Natural Habitat ◽  
Brain Cooling ◽  
Selective Brain Cooling ◽  
Free Ranging

Blood and brain temperatures of free-ranging black wildebeest in their natural environment

1994 ◽  
Vol 267 (6) ◽  
pp. R1528-R1536 ◽  
Author(s):  
C. Jessen ◽  
H. P. Laburn ◽  
M. H. Knight ◽  
G. Kuhnen ◽  
K. Goelst ◽  
...  
Keyword(s):  
Brain Temperature ◽  
Natural Habitat ◽  
Radiant Heat ◽  
Brain Cooling ◽  
Selective Brain Cooling ◽  
Blood Temperature ◽  
Arterial Blood ◽  
Data Loggers ◽  
Free Ranging ◽  
Arterial Blood Temperature

Using miniature data loggers, we measured the temperatures of carotid blood and brain in four wildebeest (Connochaetes gnou) every 2 min for 3 wk and every 5 min, in two of the animals, for a further 6 wk. The animals ranged freely in their natural habitat, in which there was no shelter. They were subject to intense radiant heat (maximum approximately 1,000 W/m2) during the day. Arterial blood temperature showed a circadian rhythm with low amplitude (< 1 degree C) and peaked in early evening. Brain temperature was usually within 0.2 degrees C of arterial blood temperature. Above a threshold between 38.8 and 39.2 degrees C, brain temperature tended to plateau so that the animals exhibited selective brain cooling. However, selective brain cooling sometimes was absent even when blood temperature was high and present when it was low. During helicopter chases, selective brain cooling was absent, even though brain temperature was near 42 degrees C. We believe that selective brain cooling is controlled by brain temperature but is modulated by sympathetic nervous system status. In particular, selective brain cooling may be abolished by high sympathetic activity even at high brain temperatures.

Free-ranging ostriches do not employ selective brain cooling

2000 ◽  
Vol 126 ◽  
pp. S39
Author(s):  
A Fuller ◽  
P.R Kamerman ◽  
S.K Maloney ◽  
G Mitchell ◽  
D Mitchell
Keyword(s):  
Brain Cooling ◽  
Selective Brain Cooling ◽  
Free Ranging

Brain thermal inertia, but no evidence for selective brain cooling, in free-ranging western grey kangaroos (Macropus fuliginosus)

2008 ◽  
Vol 179 (3) ◽  
pp. 241-251 ◽  
Author(s):  
Shane K. Maloney ◽  
Andrea Fuller ◽  
Leith C. R. Meyer ◽  
Peter R. Kamerman ◽  
Graham Mitchell ◽  
...  
Keyword(s):  
Thermal Inertia ◽  
Brain Cooling ◽  
Selective Brain Cooling ◽  
Free Ranging

scholarly journals Brain Cooling: An Economy Mode of Temperature Regulation in Artiodactyls

Physiology ◽  
1998 ◽  
Vol 13 (6) ◽  
pp. 281-286 ◽  
Author(s):  
Claus Jessen
Keyword(s):  
Heat Stress ◽  
Body Temperature ◽  
Heat Loss ◽  
Temperature Regulation ◽  
Thermal Damage ◽  
Brain Temperature ◽  
Brain Cooling ◽  
Selective Brain Cooling ◽  
Free Ranging ◽  
The Brain

Artiodactyls employ selective brain cooling (SBC) regularly during experimental hyperthermia. In free-ranging antelopes, however, SBC often was present when body temperature was low but absent when brain temperature was near 42°C. The primary effect of SBC is to adjust the activity of the heat loss mechanisms to the magnitude of the heat stress rather than to the protection of the brain from thermal damage.

Aspects of the Water, Electrolyte and Carbohydrate Physiology of the Silvereye, Zosterops Lateralis (Aves).

1983 ◽  
Vol 31 (5) ◽  
pp. 695 ◽  
Author(s):  
IJ Rooke ◽  
SD Bradshaw ◽  
RA Langworthy
Keyword(s):  
Natural Habitat ◽  
Tritiated Water ◽  
Free Water ◽  
Laboratory Studies ◽  
Turnover Rates ◽  
Natural Habitats ◽  
Water Influx ◽  
Zosterops Lateralis ◽  
Total Body ◽  
Free Ranging

Total body water content (TBW) and TBW turnover were measured by means of tritiated water (HTO) in free-ranging populations of silvereyes, Zosterops lateralis, near Margaret River, W.A. Birds were studied in their natural habitats during spring and summer, and compared with a vineyard population in summer. In the natural habitat TBW content was found to be 77.6% in spring, which was not significantly different from that measured in summer (78.3%). Birds in vineyards in summer, however, were dehydrated, with a TBW content of 69.4%. Calculated rates of water influx for spring, summer and summer vineyards birds were 1.44,2.20 and 0.65 ml g.day-' respectively. These water turnover rates are much higher than those of any other bird yet studied. Dehydration was marked in the vineyard birds, with a significantly lower TBW content and an average net water loss of 0.63 ml day-'. Laboratory studies showed that silvereyes have a low tolerance to sodium loading. Their tolerance is, however, quite adequate for them to drink the most concentrated free water available to them in the field. Ingestion of concentrated sugar solutions of up to 25% did not provoke an osmotic diuresis and thus cannot account for the dehydration and negative water balance of vineyard birds.

Selective Brain Cooling in the Horse during Exercise

1994 ◽  
pp. 189-193 ◽  
Author(s):  
F. F. McConaghy ◽  
J. R. S. Hales ◽  
D. R. Hodgson
Keyword(s):  
Brain Cooling ◽  
Selective Brain Cooling

Efficacy of Selective Brain Cooling Using a Nasopharyngeal Method in Piglets

2015 ◽  
Vol 24 (1) ◽  
pp. 140-149 ◽  
Author(s):  
Mohammad Fazel Bakhsheshi ◽  
Errol E. Stewart ◽  
Joo Ho Tai ◽  
Laura Morrison ◽  
Lynn Keenliside ◽  
...  
Keyword(s):  
Brain Cooling ◽  
Selective Brain Cooling

Novelty at dawn: Exploration, low neophobia and crepuscular activity in a wild Common Buzzard (Buteo buteo)

2021 ◽  
pp. 175815592110524
Author(s):  
Berenika Mioduszewska ◽  
Mark O’Hara ◽  
Rafał Stryjek
Keyword(s):  
Foraging Ecology ◽  
Natural Habitat ◽  
Field Studies ◽  
Field Method ◽  
Cognitive Testing ◽  
Research Attention ◽  
Predator Species ◽  
Common Buzzard ◽  
Buteo Buteo ◽  
Free Ranging

Raptor cognition has received limited research attention, despite the importance of comparative investigations for reconstructing the evolution of complex cognition. Field studies provide essential ecological context for cognition in the natural habitat, although this approach is often challenging due to extensive procedures involved in cognitive testing. One predisposition suggested to contribute to problem-solving behaviour is the response to novel stimuli. In this pilot study, a novel object test was conducted on an outdoor feeding platform to assess the neotic responses of a single wild free-ranging Common Buzzard ( Buteo buteo), a generalist/opportunist diurnal predator species. Additionally, data on its daily activity were collected. As predicted, the subject expressed low neophobia and some exploratory behaviours. Interestingly, it repeatedly arrived on the platform in low light conditions. This study highlights the influence of foraging ecology on cognitive predispositions and offers a field method for research on raptor cognition.

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