| Summary: | 碩士 === 國立成功大學 === 生物學系 === 84 === We investigated rates of evaporative water loss (EWL) in seven
arboreal and three nonarboreal anuran species and compared with
EWL of the agar replicas. All seven arboreal species showed
significantly lower EWL than those of the nonarboreal species.
Cutaneous resistance to EWL in the arboreal species ranging from
1.21 to 3.33 s/cm, were significantly higher than those of the
nonarboreal species and freewater surface. Behavior had an
important effect on reducing EWL in the arboreal species and
Bufo melanosticus, but was not important in the other two
nonarboreal species, Rhacophorus japonicus and Rana longicrus.
Increasing wind speed significantly reduced boundary
layerresistance and increased EWL, especially in nonarboreal
species. Relationship between temperature and EWL of
Rhacophorus moltrechti and Robustus japonicus were measured at
15, 18, 21, 24 and 27 degrees.No physiological thermoregulation
by evaporative cooling was observedwithin the temperature range.
Cutaneous structures of the seven specieswere also investigated
by light microscopy on the freeze and paraffinsections.
However, no cutaneous lipid glands nor lipid layers werefound.
Neither iridophores in dorsal skin increased. The mechanismfor
cutaneous resistance in the arboreal frogs remains to be
studied.
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