Humidity in the Avian Nest and Egg Water Loss during Incubation
Humidity in the Avian Nest and Egg Water Loss during Incubation
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禽巢中的湿度和孵化过程中蛋的水分流失
DOI：
10.1086/physzool.50.4.30155731
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
C. Paganelli
中科院分区：
文献类型：
--
作者：
H. Rahn;R. Ackerman;C. Paganelli
本文介绍了一种用于测定自然孵化过程中鸟蛋周围鸟巢空气绝对湿度的扩散式湿度计。研究中的物种的空蛋壳充满了干燥剂，并通过观察其暴露于已知的水蒸气张力时的重量变化进行校准。然后将这样的蛋放在巢中几天，记录其重量增加的速率，由此可以计算暴露期间的平均蒸汽压。8种鸟类巢内小气候的水汽压变化范围为18 ~ 26 ℃。一个间接的方法来预测巢的空气蒸气压，而不使用湿度计，并为其他10个物种的收益率值类似的扩散湿度计。巢内空气的蒸气压总是大于周围空气的蒸气压;根据两者的差值和已知的蛋的失水率，可以计算出巢内的通风量。
An egg diffusion hygrometer is described for measurement of absolute humidity in the nest air immediately surrounding bird eggs during natural incubation. The empty eggshell of the species under study is filled with a drying agent and calibrated by observing its weight change in time upon exposure to known water vapor tensions. Such an egg is then placed in the nest for several days and its rate of gain in weight recorded, from which the mean vapor pressure during exposure can be calculated. The vapor pressure in the nest microclimate of eight species varied from 18 to 26 torr. An indirect method for predicting nest air vapor pressure without the use of a hygrometer is also presented, and for 10 other species yields values similar to those of the diffusion hygrometer. The vapor pressure of nest air is always greater than that of ambient air; from the difference and the known rate of water loss of the egg, nest ventilation can be calculated.