Tables
Table 1: Mean (± SD) evaporative water loss (EWL in mg/min) of agar frog
models (3% agar) made from six anuran species. These values of EWL were
used to correct the values of water exchange shown in Fig. 1. Mean body
masses of the frogs used to make the models are given in Fig. 1.
Species Mean EWL n
(mg/min)
Xenopus laevis 0.42 ± 0.02 4
Rana catesbeiana 4.7 ± 0.93 3
Rana pipiens 2.8 ± 0.42 4
Bufo boreas 2.5 ± 0.16 3
Pseudacris cadaverina 0.54 ± 0.15 4
Pseudacris regilla 0.53 ± 0.06 4
Table 2: Osmotic potentials of blood (mean ±SD) in six anuran species
while at 100% and 90% standard body mass (the mass of a fully hydrated
frog with an empty bladder) as measured using a freezing point
osmometer. Sample sizes are given in parentheses. Water potentials at
90% hydration for all species were significantly higher (t = 1.995,P < 0.05) from those at 100% hydration. Letters
designate osmotic potentials at 90% hydration that were statistically
similar by Tukey HSD posthoc analysis (Q = 2.93, P <
0.05).
Osmotic Potential (-kPa)
Species Blood (100%) Blood (90%)
Xenopus laevis 581 ± 23 (6) 686 ± 29 (7) dRana catesbeiana 480 ± 32 (12) 580 ± 13 (6) dRana pipiens 593 ± 22 (7) 635 ± 31 (7) cBufo boreas 590 ± 7 (6) 685 ± 11 (8) bPseudacris cadaverina 635 ± 35 (4) 707 ± 13 (3) bPseudacris regilla 710 ± 44 (6) 842 ± 41 (9) a