We measured rates of evaporative water loss (EWL) in Litoria aurea at 25, 30, 33, and 35°C. There was a substantial rise in EWL over this range of temperatures, averaging 12.3 and 23.5 mg g-1 h-1 at 25 and 35°C, respectively. The rise in EWL over this temperature interval was associated with a corresponding drop in cutaneous resistance to water vapour flux (rc) which steadily declined from 6.9 to 3.5 s cm-1. The average highest rc measured for these eight frogs was 7 s cm-1 which places this species amongst frogs considered to have moderately waterproof skins. We also quantified the spectral reflectance of L aurea dorsal skin at wavelengths between 280 and 900 nm, The skin had a peak at 550 nm which was expected for a green frog, but lacked the abrupt rise in reflectance at about 700 nm found in green leaves and some other species of green, leaf-sitting Litoria species. The absence of high near-infra-red reflectivity in L aurea is attributed to its retention of melanin as a darkening pigment instead of pterorhodin which is used instead by green, leaf-sitting Litorine and Phyllomedusine frogs showing complete crypsis with green leaves.

Amey, A. P. and Grigg, G. C., 1995. Lipid-reduced evaporative water loss in too arboreal hylid frogs. Comp. Biochem. Phvsiol. (in press).
Bagnara, J. T., Taylor, J. D. and Prota, G., 1973. Color changes, unusual melanosomes, and a new pigment from leaf frogs. Science 182: 1034-35.
Color changes, unusual melanosomes, and a new pigment from leaf frogs
Science
, vol. 
182
 (pg. 
1034
-
35
)
Bagnara J. T. and Ferris, W., 1975. The presence of phyllomedusine melanosomes in Australian hylids. Copeia 1975: 592-95.
The presence of phyllomedusine melanosomes in Australian hylids
Copeia
, vol. 
1975
 (pg. 
592
-
95
)
Bakken, G. S., Vanderbilt, V. C., Butterner, W. A. and Dawson, W. R., 1978. Avian eggs: thermoregulatory value of very high near-infra-red reflectance. Science 200: 321-23.
Avian eggs: thermoregulatory value of very high near-infra-red reflectance
Science
, vol. 
200
 (pg. 
321
-
23
)
Buttemer, W. A., 1990. Effect of temperature on evaporative water loss of the Australian tree frogs Litoria caerulea and Litoria chloris. Physiol. Zool. 63: 1043-57.
Effect of temperature on evaporative water loss of the Australian tree frogs Litoria caerulea and Litoria chloris
Physiol. Zool.
, vol. 
63
 (pg. 
1043
-
57
)
Cott, H. B., 1940. Adaptive Coloration in Animals. Methuen: London.
Adaptive Coloration in Animals
Emerson, S. B., Cooper, T. A. and Ehleringer, J. R., 1990. Convergence in reflectance spectra among treefrogs. Functional Ecol. 4: 47-51.
Convergence in reflectance spectra among treefrogs
Functional Ecol.
, vol. 
4
 (pg. 
47
-
51
)
Johnson, C. R., 1970. Observations on body temperatures, critical thermal maxima and tolerance to water loss in the Australian hylid, Hyla caerulea (White). Proc. R. Soc. Qld 82: 47-50.
Observations on body temperatures, critical thermal maxima and tolerance to water loss in the Australian hylid, Hyla caerulea (White)
Proc. R. Soc. Qld
, vol. 
82
 (pg. 
47
-
50
)
Krempels, D., 1988. Near-infra-red reflectance of amphibians and reptiles: spectral sensitivity and brightness discrimination of an avian predator (Accipitridae: Buteo spp.). Program and Abstracts ASIH, SSAR and Herpetologists League Combined Meetings: Ann Arbor, Michigan, USA.
Near-infra-red reflectance of amphibians and reptiles: spectral sensitivity and brightness discrimination of an avian predator (Accipitridae: Buteo spp.)
Main, A. R. and Bentley, P. J., 1964. Water relations of Australian burrowing frogs and tree frogs. Ecology 45: 379-82.
Water relations of Australian burrowing frogs and tree frogs
Ecology
, vol. 
45
 (pg. 
379
-
82
)
McClanahan, L. L. and Baldwin, R., 1969. Rate of water uptake through the integument of the desert toad Bufo cognatus. Comp. Biachem. Physiol. 28: 381-89.
Rate of water uptake through the integument of the desert toad Bufo cognatus
Comp. Biachem. Physiol.
, vol. 
28
 (pg. 
381
-
89
)
Misuraca, G., Prota, G., Bagnara, J. T. and Frost, S. K., 1977. Identification of the leaf-frog melanophore pigment, rhodomelanochrome as pterorhodin. Comp. Biochem. Physiol. 57: 41-43.
Identification of the leaf-frog melanophore pigment, rhodomelanochrome as pterorhodin
Comp. Biochem. Physiol.
, vol. 
57
 (pg. 
41
-
43
)
Pough, F. H., Taigen, T. L., Stewart, M. M. and Brussard, P. F., 1983. Behavioral modification of evaporative water loss by a Puerto Rican frog. Ecology 64: 244-52.
Behavioral modification of evaporative water loss by a Puerto Rican frog
Ecology
, vol. 
64
 (pg. 
244
-
52
)
Spotila J. R. and Berman, E. N., 1976. Determination of skin resistance and the role of the skin in controlling water loss in amphibians and reptiles. Comp. Biochem. Physiol. 55A: 407-11.
Determination of skin resistance and the role of the skin in controlling water loss in amphibians and reptiles
Comp. Biochem. Physiol.
, vol. 
55A
 (pg. 
407
-
11
)
Withers, P. C., 1995. Evaporative water loss and colour change in the desert tree frog Litoria rubella (Amphibia: Hylidae). Rec. West. Aust. Mus. 17: 277-81.
Evaporative water loss and colour change in the desert tree frog Litoria rubella (Amphibia: Hylidae)
Rec. West. Aust. Mus.
, vol. 
17
 (pg. 
277
-
81
)
Withers, P. C., Hillman, S. S., Drewes, R. C. and Sokol, O. M., 1982. Water loss and nitrogen excretion in sharp-nosed reed frogs (Hyperolius nasutur: Anura, Hyperoliidae). J Exp. Biol. 97: 335-43.
Water loss and nitrogen excretion in sharp-nosed reed frogs (Hyperolius nasutur: Anura, Hyperoliidae)
J Exp. Biol.
, vol. 
97
 (pg. 
335
-
43
)
Withers, P. C., Hillman, S. S. and Drewes, R. C., 1984. Evaporative water loss and skin lipids of anuran amphibians. J. Exp. Zool. 232: 11-17.
Evaporative water loss and skin lipids of anuran amphibians
J. Exp. Zool.
, vol. 
232
 (pg. 
11
-
17
)
Wygoda, M. L., 1984. Low cutaneous water loss in arboreal frogs. Physiol Zool. 57: 329-37.
Low cutaneous water loss in arboreal frogs
Physiol Zool.
, vol. 
57
 (pg. 
329
-
37
)
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