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The role of an insulative pelage in ...

Kauffman, Alexander Strasser.

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The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus)./
作者:	Kauffman, Alexander Strasser.
面頁冊數:	142 p.
附註:	Chair: Irving Zucker.
Contained By:	Dissertation Abstracts International63-09B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3063426
ISBN:	0493822879

The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus).
Kauffman, Alexander Strasser.

The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus). - 142 p.

Chair: Irving Zucker.

Thesis (Ph.D.)--University of California, Berkeley, 2002.

Small mammals rely on several behavioral and physiological thermoregulatory adaptations to promote heat production and alleviate heat loss in the cold. In Experiments 1–4, daily food intake was measured under simulated summer and winter conditions in intact Siberian hamsters (<italic>Phodopus sungorus </italic>) and those with varying amounts of pelage removed. Energy intake increased up to 44% above baseline control values for &sim;2–3 weeks after complete shaving. Increases in food intake were greater in hamsters housed in short than long day lengths and at low (5°C) than moderate (23°C) ambient temperatures.

ISBN: 0493822879Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus).
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245 1 0 $a The role of an insulative pelage in the daily energetics of Siberian hamsters (Phodopus sungorus).
300 $a 142 p.
500 $a Chair: Irving Zucker.
500 $a Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4001.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2002.
520 $a Small mammals rely on several behavioral and physiological thermoregulatory adaptations to promote heat production and alleviate heat loss in the cold. In Experiments 1–4, daily food intake was measured under simulated summer and winter conditions in intact Siberian hamsters (<italic>Phodopus sungorus </italic>) and those with varying amounts of pelage removed. Energy intake increased up to 44% above baseline control values for &sim;2–3 weeks after complete shaving. Increases in food intake were greater in hamsters housed in short than long day lengths and at low (5°C) than moderate (23°C) ambient temperatures.
520 $a Siberian hamsters maintained in short photoperiods display spontaneous torpor bouts several times a week. Daily torpor is associated with reduced daily energy expenditure and lower food consumption. Experiment 5 tested the extent to which the energy savings conferred by daily torpor depends on the presence of pelage insulation.
520 $a Adjustments in daily locomotor activity can counteract thermoenergetic challenges posed by low environmental temperatures. Experiment 6 determined that hamsters exposed to a Ta of 5°C increased their general locomotor activity by 50% relative to animals maintained in 23°C.
520 $a Huddling and nest-building behaviors reduce heat loss by decreasing the exposed surface area and providing a form of external insulation. Experiments 7 determined that furred Siberian hamsters housed in groups consumed 16% less food each day than singly-housed individuals. Furless hamsters ate &sim;39% more food each day relative to furred animals, whether housed in groups or singly; the absolute amount of food consumed per animal was 16% lower in the group- versus singly-housed shaved animals. The energy savings achieved with huddling in furless hamsters were identical to those observed in group-housed furred animals, indicating that huddling shaved and huddling furred hamsters conserve energy to the same degree. Experiment 8 documented that furred Siberian hamsters consume 18% less food each day when provided with nesting material; the increases in food intake caused by fur removal were reduced by &sim;80% in shaved animals given access to nesting material. (Abstract shortened by UMI.)
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