Thermoregulatory role of insensible evaporative water loss constancy in a heterothermic marsupial
MetadataShow full item record
© 2017 The Author(s). 'Insensible' evaporative water loss of mammals has been traditionally viewed as a passive process, but recent studies suggest that insensible water loss is under regulatory control, although the physiological role of this control is unclear. We test the hypothesis that regulation of insensible water loss has a thermoregulatory function by quantifying for the first time evaporative water loss control, along with metabolic rate and body temperature, of a heterothermic mammal during normothermia and torpor. Evaporative water loss was independent of ambient relative humidity at ambient temperatures of 20 and 30°C, but not at 25°C or during torpor at 20°C. Evaporative water loss per water vapour pressure deficit had a positive linear relationship with relative humidity at ambient temperatures of 20 and 30°C, but not at 25°C or during torpor at 20 or 25°C. These findings suggest that insensible water loss deviates from a physical model only during thermoregulation, providing support for the hypothesis that regulation of insensible evaporative water loss has a thermoregulatory role.
Showing items related by title, author, creator and subject.
Evaporative water loss, relative water economy and evaporative partitioning of a heterothermic marsupial, the monito del monte (Dromiciops gliroides)Withers, Philip; Cooper, Christine; Nespolo, R. (2012)We examine here evaporative water loss, economy and partitioning at ambient temperatures from 14 to 33°C for the monito delmonte (Dromiciops gliroides), a microbiotheriid marsupial found only in temperate rainforests of ...
How do measurement duration and timing interact to influence estimation of basal physiological variables of a nocturnal rodent?Connolly, M.; Cooper, Christine (2014)Metabolic rate and evaporative water loss are two commonly measured physiological variables. It is therefore important, especially for comparative studies, that these variables (and others) are measured under standardised ...
Physiological responses of a rodent to heliox reveal constancy of evaporative water loss under perturbing environmental conditionsCooper, Christine; Withers, P. (2014)Total evaporative water loss of endotherms is assumed to be determined essentially by biophysics, at least at temperatures below thermoneutrality, with evaporative water loss determined by the water vapor deficit between ...