Scaling of total evaporative water loss and evaporative heat loss in birds at different ambient temperatures and seasons

Gavrilov, V.M.; Gavrilov, V.V.

Авторы: Gavrilov Valery M., Gavrilov Vadim V.
Журнал: International Journal of Avian & Wildlife Biology
Том: 4
Номер: 2
Год издания: 2019
Первая страница: 40
Последняя страница: 47
DOI: 10.15406/ijawb.2019.04.00150
Аннотация: Simultaneous measurements of energy expenditure and weight loss in resting birds allowed determining stoichiometrically total evaporative water loss (TEWL) in non-passerines and passerines. Amount of heat dissipated through water evaporation depends on body size. The dependence of evaporative heat loss on ambient temperatures (TA) obtained from the energy equivalent in the species studied in this work is the same as that measured with traditional methods. The dependence of water loss on determining body mass at different TA varies in the same way to the correlation between evaporative and non-evaporative heat loss. In Passeriformes, TEWL is approximately 25–40% higher than in non-passerines (particularly at high TA), which is consistent with the ratio of their basal metabolic rate (BMR) levels. A high BMR in Passeriformes includes not only net benefits but also its maintenance requires a definite cost. A large expenditure of evaporative water determines the cost of the advantages of BMR increase. This expenditure increased with the body size in Passeriformes due to the forced evaporative heat loss and showed virtually no increase in Non-Passeriformes. The correlation between evaporative and non-evaporative heat loss at different ambient temperatures reflects this cost. A great amount of evaporative water (particularly in large passerine) imposes strong limitations on the range of sizes in Passeriformes. Keywords: water loss, heat dissipation, evaporation, respiration, thermoregulation, metabolic heat production, energetic equivalent of the loss body mass, birds
Добавил в систему: Гаврилов Валерий Михайлович

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Scaling of total evaporative water loss and evaporative heat loss in birds at different ambient temperatures and seasonsстатья

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