The effects of temperature on the metabolic rate and evaporative water loss of the sage sparrow Amphispiza belli nevadensis

Comparative biochemistry and physiology Pub Date : 1970-10-01 DOI:10.1016/0010-406X(70)91033-9

Ralph R. Moldenhauer

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引用次数: 9

Abstract

1.
1. The thermoneutral zone of the sage sparrow, Amphispiza belli nevadensis, extended from ca. 28 to 37°C. The standard metabolic rate at 35°C was 7·41 kcal/day (mean body wt. = 18·6 g
2.
2. The temperature coefficient (5·8 per cent) and thermal conductance (3·96 kcal/m² per hr per °C) were relatively high, indicating poor insulation which is adaptive for desert existence.
3.
3. Between 10 and 35°C the rate of evaporative water loss was constant and averaged 6·7 mg H₂O/g per hr. Evaporative cooling began above 35°C.
4.
4. At high temperatures (43°C) and low humidities (25 per cent) sage sparrows dissipate up to 110 per cent of their metabolic heat production by evaporative cooling.
5.
5. The heat dissipating characteristics and evaporative cooling efficiency of the sage sparrow are somewhat less than in other desert birds.

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温度对鼠尾草麻雀代谢率和蒸发失水的影响

1.1. 鼠尾草(Amphispiza belli nevadensis)的热中性区从28°C扩大到37°C。35°C时的标准代谢率为7.41 kcal/d(平均体重= 18.6 g2.2)。温度系数(5.8%)和热导率(3.96千卡/平方米每小时每°C)相对较高，表明隔热较差，适合沙漠生存。在10 ~ 35°C之间，蒸发水损失率恒定，平均为6.7 mg H2O/g / hr。蒸发冷却在35℃以上开始。在高温(43°C)和低湿度(25%)下，鼠尾草麻雀通过蒸发冷却消耗了高达110%的代谢热。鼠尾草的散热特性和蒸发冷却效率略低于其他沙漠鸟类。

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Comparative biochemistry and physiology

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