Water turnover and the northern range of the koala (Phascolarctos cinereus).

2007 ◽  
Vol 29 (1) ◽  
pp. 85 ◽  
Author(s):  
I.D. Clifton ◽  
W.A.H. Ellis ◽  
A. Melzer ◽  
G. Tucker
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Water Loss ◽  
Evaporative Water Loss ◽  
Water Requirements ◽  
Water Turnover ◽  
Evaporative Water ◽  
Phascolarctos Cinereus ◽  
Energy Demands ◽  
Cooling Mechanism

Water turnover for koalas is positively correlated with the moisture content of selected trees suggesting that browse choice was driven by water requirements in summer but energy demands in winter. We compared the distribution of the koala to relative humidity and found that the bioregional delineation of the koala?s range corresponds closely to regions experiencing an average 9am relative humidity of less than 80% in February. This indicates that the northern coastal distribution of the koala may be limited by respiratory evaporative water loss as a cooling mechanism.

In Vivo Cutaneous and Perceived Comfort Response to Fabric: Part VI: The Effect of Moist Fabrics on Stratum Corneum Hydration

1997 ◽  
Vol 67 (12) ◽  
pp. 926-931 ◽  
Author(s):  
Kathryn L. Hatch ◽  
Harriet H. Prato ◽  
S. Haig Zeronian ◽  
Howard I. Maibach
Keyword(s):  
Moisture Content ◽  
Stratum Corneum ◽  
Water Loss ◽  
Initial Moisture Content ◽  
Polyester Fabric ◽  
Evaporative Water Loss ◽  
Evaporative Water ◽  
Potential Health ◽  
Stratum Corneum Hydration

Materials placed over human skin may change the stratum corneum (sc) hydration level, an important phenomenon because increases in normal levels of sc hydration pose potential health problems. This study examines the relationship between fabric moisture content and level of sc hydration so that the role of fabric moisture on sc hydration may be better understood. Three fabric/moisture treatments are placed on the sc—3.5-denier polyester fabric with an initial moisture content of 35% and cotton fabrics with either 44% or 75% initial moisture content—then covered with an occlusive dome. sc evaporative water loss (ewl) is measured before treatment placement and after 30 and 60 minutes of contact. The amount of moisture in the fabric at time of removal is calculated two different ways, and three analyses of variance are done using the evaporative water loss and two fabric final moisture content data sets. The rate of ewl is significantly higher after 30 minutes of treatment contact with sc than after 60 minutes of contact. The amount of moisture in the fabrics is significantly less at time 60 than at time 30, implying that the sc is more hydrated at 30 minutes than at 60 minutes. However, the fabrics contain less moisture when removed at 60 minutes than at 30 minutes. As fabric moisture content decreases, sc hydration decreases. The question we are not able to answer is “Where does the moisture go that is initially in the fabric?’

Thermoregulation, Oxygen-Consumption and Water Turnover in Stubble Quail, Coturnix-Pectoralis, and King Quail, Coturnix-Chinensis

1986 ◽  
Vol 34 (1) ◽  
pp. 25 ◽  
Author(s):  
JR Roberts ◽  
RV Baudinette
Keyword(s):  
Oxygen Consumption ◽  
Body Temperature ◽  
Ambient Temperature ◽  
Water Loss ◽  
Evaporative Water Loss ◽  
Arid Areas ◽  
Water Turnover ◽  
Evaporative Water ◽  
Ambient Temperatures ◽  
Regulate Body Temperature

Stubble quail occur in more arid areas of Australia than king quail; however, the rates of metabolism and the ability to regulate body temperature in response to varying ambient temperature are similar in both birds, and resemble those of other quail species. At high ambient temperatures, rates of heat loss mediated by evaporative water loss are lower than those previously reported for more xerophilic species. Overall rates of water turnover and evaporative water loss at lower ambient temperatures are at the lower end of the range predicted for birds.

scholarly journals Thermoregulatory role of insensible evaporative water loss constancy in a heterothermic marsupial

2017 ◽  
Vol 13 (11) ◽  
pp. 20170537 ◽  
Author(s):  
Christine Elizabeth Cooper ◽  
Philip Carew Withers
Keyword(s):  
Relative Humidity ◽  
Water Loss ◽  
Physiological Role ◽  
Vapour Pressure Deficit ◽  
Evaporative Water Loss ◽  
Regulatory Control ◽  
Water Vapour Pressure ◽  
Evaporative Water ◽  
Ambient Temperatures

‘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.

Shell Resistance and Evaporative Water Loss from Bird Eggs: Effects of Wind Speed and Egg Size

1981 ◽  
Vol 54 (2) ◽  
pp. 195-202 ◽  
Author(s):  
James R. Spotila ◽  
Christina J. Weinheimer ◽  
Charles V. Paganelli
Keyword(s):  
Wind Speed ◽  
Water Loss ◽  
Egg Size ◽  
Evaporative Water Loss ◽  
Evaporative Water ◽  
Bird Eggs

Scaling of Evaporative Water Loss in Marsupials

1986 ◽  
Vol 59 (1) ◽  
pp. 1-9 ◽  
Author(s):  
David S. Hinds ◽  
Richard E. MacMillen
Keyword(s):  
Water Loss ◽  
Evaporative Water Loss ◽  
Evaporative Water
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