Effects of ambient water vapor pressure and temperature on evaporative water loss inPeromyscus maniculatus andMus musculus

Edwards, Richard M.; Haines, Howard

doi:10.1007/bf00689482

Cited by 32 publications

(36 citation statements)

References 34 publications

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“…Various studies have reported that EWL changes inversely with RH and wvp (or linearly with Dwvp) for small endotherms [5][6][7][8][9][10][11][12][13], consistent with a simple physical model. However, some studies have reported a lower or no relationship between EWL and RH or Dwvp, generally at low or moderate T a [12][13][14].…”

Section: (B) Effect Of Relative Humidity On Evaporative Water Losssupporting

confidence: 53%

“…Water vapour pressure (wvp) is an equivalent measure of water potential to x [1], so EWL should be inversely and linearly related to ambient wvp and positively linearly related to water vapour pressure deficit (Dwvp ¼ wvp sat 2 wvp o ). Various studies have reported that EWL changes inversely with RH and wvp, or linearly with Dwvp, for various small endotherms at and below thermoneutrality [5][6][7][8][9][10][11][12][13], as expected from physical principles. However, a few studies have reported a lower or even opposite relationship between EWL and RH, wvp or Dwvp [12][13][14].…”

Section: Introductionmentioning

confidence: 69%

“…For brushtail possums [14], there was a significant RH effect on MR at T a ¼ 308C, sufficient to maintain a constant T b when EWL (and thus EHL) was reduced at higher RH. However, RH does not affect T b or MR for some rodents [6,7,38]. For kalutas, T b increased significantly only at the highest RH, where EWL (and thus EHL) were significantly reduced; at lower RH, EWL as well as T b , MR and C were independent of RH.…”

Section: (D) Other Physiological Implications Of Evaporative Water Lomentioning

confidence: 84%

“…It is customary to calculate Dwvp as the difference between wvp at 100% RH and ambient T a and wvp at ambient RH and T a [7,14,20]. Skin temperature is more appropriate than T a to calculate Dwvp [16], but its measurement is more difficult, so ambient temperature is generally used as a proxy.…”

Section: (B) Respirometrymentioning

confidence: 99%

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Physiological regulation of evaporative water loss in endotherms: is the little red kaluta (Dasykaluta rosamondae) an exception or the rule?

Withers

Cooper

2014

Proc. R. Soc. B.

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It is a central paradigm of comparative physiology that the effect of humidity on evaporative water loss (EWL) is determined for most mammals and birds, in and below thermoneutrality, essentially by physics and is not under physiological regulation. Fick's law predicts that EWL should be inversely proportional to ambient relative humidity (RH) and linearly proportional to the water vapour pressure deficit (Dwvp) between animal and air. However, we show here for a small dasyurid marsupial, the little kaluta (Dasykaluta rosamondae), that EWL is essentially independent of RH (and Dwvp) at low RH (as are metabolic rate and thermal conductance). These results suggest regulation of a constant EWL independent of RH, a hitherto unappreciated capacity of endothermic vertebrates. Independence of EWL from RH conserves water and heat at low RH, and avoids physiological adjustments to changes in evaporative heat loss such as thermoregulation. Re-evaluation of previously published data for mammals and birds suggests that a lesser dependence of EWL on RH is observed more commonly than previously thought, suggesting that physiological independence of EWL of RH is not just an unusual capacity of a few species, such as the little kaluta, but a more general capability of many mammals and birds.

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Section: (B) Effect Of Relative Humidity On Evaporative Water Losssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 69%

Section: (D) Other Physiological Implications Of Evaporative Water Lomentioning

confidence: 84%

Section: (B) Respirometrymentioning

confidence: 99%

See 2 more Smart Citations

Physiological regulation of evaporative water loss in endotherms: is the little red kaluta (Dasykaluta rosamondae) an exception or the rule?

Withers

Cooper

2014

Proc. R. Soc. B.

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“…Thus animals should have higher EWL under drier ambient conditions. This relationship between EWL and ambient WVP is generally inverse and linear for small animals including birds (Lasiewski et al, 1966), rodents (Baudinette, 1972;Christian, 1978;Edwards and Haines, 1978) and bats (Proctor and Studier, 1970;Webb et al, 1995). There is also in theory an influence of ambient RH on metabolic rate, as reduced evaporative heat loss due to high RH and low WVP will decrease wet thermal conductance (C wet ) and thus might reduce metabolic heat production and/or increase body temperature (T b ) and dry thermal conductance (C dry ).…”

Section: Introductionmentioning

confidence: 99%

Allometry of evaporative water loss in marsupials: implications of the effect of ambient relative humidity on the physiology of brushtail possums(Trichosurus vulpecula)

Cooper

Withers

2008

Journal of Experimental Biology

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SUMMARYTo better understand the effects of ambient relative humidity (RH) on physiological variables and the implications of RHcorrecting evaporative water loss (EWL) data for marsupials, we examined the effect of RH on EWL, body temperature (T b ), metabolic rate (MR) and thermal conductance (C) of the brushtail possum (Trichosurus vulpecula), a medium-sized marsupial. Correcting EWL data for 27 species of marsupial for water vapour pressure deficit (ΔWVP) in the chamber during measurement significantly increased, rather than decreased, the variability of the allometric relationship for EWL. For the brushtail possum, both ambient temperature (T a ) and RH significantly affected EWL. At T a =25°C, EWL was independent of RH at ≤63% RH, but decreased linearly at higher RH values. At T a =30°C, EWL was significantly related to RH from 26% to 92% RH. There was a significant effect of T a on T b and dry thermal conductance (C dry ; higher at 30°C), but no effect of RH. For MR and wet thermal conductance (C wet ) there was a significant effect of T a (MR higher and C wet lower at 25°C), and RH at T a =30°C (MR higher and C wet lower at the lowest RH) but not at 25°C. Our results indicate that brushtail possums do not necessarily show the linear relationship between ambient RH and EWL expected for an endotherm, possibly because of behavioural modification of their immediate microclimate. This may account for the failure of WVP deficit correction to improve the allometric EWL relationship for marsupials. Chamber RH is an important environmental factor to be considered when measuring standard physiological variables such as MR and C wet .

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Effect of temperature and humidity on evaporative water loss in Anna's hummingbird (Calypte anna)

Powers

1992

J Comp Physiol B

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Effects of ambient water vapor pressure and temperature on evaporative water loss inPeromyscus maniculatus andMus musculus

Cited by 32 publications

References 34 publications

Physiological regulation of evaporative water loss in endotherms: is the little red kaluta (Dasykaluta rosamondae) an exception or the rule?

Physiological regulation of evaporative water loss in endotherms: is the little red kaluta (Dasykaluta rosamondae) an exception or the rule?

Allometry of evaporative water loss in marsupials: implications of the effect of ambient relative humidity on the physiology of brushtail possums(Trichosurus vulpecula)

Effect of temperature and humidity on evaporative water loss in Anna's hummingbird (Calypte anna)

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