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Aspects Of Temperature Regulation In The Small Indian Mongoose (Herpestes Auropunctatus): Responses To Heat And Cold
|Title:||Aspects Of Temperature Regulation In The Small Indian Mongoose (Herpestes Auropunctatus): Responses To Heat And Cold|
|Contributors:||Whittow, G. (advisor)|
|Date Issued:||15 Jan 2014|
|Publisher:||University of Hawaii at Manoa|
|Abstract:||Eight adult small Indian mongooses Herpestes auropunctatus (4 males, 4 females) were exposed to air temperatures (Ta) of 5˚, 10˚, 20˚, 25˚, 30˚, 35˚, 40˚, and 45˚C. Mean body weight for males was 735.2 ± 75.9 gm (S.D.) and for females, 487.4 ± 44.6 gm (S.D.). The animals were lightly restrained, unanesthesized and in thermoregulatory stability (at Ta less than 45˚C) before data collection in an open flow system of rectal temperature, oxygen uptake, total evaporative water loss and respiration rate. Resting body temperature (39.41 ± .36˚C, S.E.) was maintained at Ta ranging from 13˚ to 37˚C. Body temperature increased below 10˚C and above 35˚C. Subjects appeared heat stressed at Ta above 38˚C. Total evaporative water loss (TEWL) remained constant below Ta = 37˚C with a mean of .033 ± .007 mg H2O/gm/hr (S.E.). A marked increase in TEWL occurred above Ta = 38˚C due to the onset of panting and salivation. The resting metabolic rate was .66 ± .18 ml O2/gm/hr (S.E.). The lower critical temperature was approximated as 29˚C, and the upper critical temperature lay between 35˚ and 40˚C. At 5˚C metabolic rate increased three times the resting level. Four animals were able to dissipate over 100% of the metabolic heat produced by evaporation at air temperatures near 45˚C. Thermal conductance reached a minimum at 30˚C with a mean of .226 ± .025 cal/(gm • hr • ˚C), implying maximal vasoconstriction below this point. Respiration frequency had a mean of 63.2 ± 15.0 breaths/min. (S.E.) below 32˚C and increased to 380.0 ± 67.9 breaths/min. (S.E.) above 38˚C, where panting was noticeable. Possible differences in sex were sought in the following parameters: oxygen consumption (at thermoneutrality), rectal temperature, and respiration rate. No significant differences were found.|
|Pages/Duration:||iv, 65 pages|
|Rights:||All UHM Honors Projects are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.|
|Appears in Collections:||
Honors Projects for Biology|
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