. Brimleyana. Zoology; Ecology; Natural history. Wood Frog Life History 33. Fig. 1. Known Alabama localities for Rana sylvatica determined during this study. Open circles represent breeding localities; inset shows position in the state of counties from which R. sylvatica is recorded. Adult Characteristics Snout-vent lengths of adult male wood frogs in Alabama averaged 50.0 mm (SD = 5.5, N = 20), and adult females averaged 60.0 mm (SD = 3.16, N = 18). These values are smaller than those given by Martof and Humphries (1959) for wood frogs in northern Georgia and western North Carolina (males: x
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. Brimleyana. Zoology; Ecology; Natural history. Wood Frog Life History 33. Fig. 1. Known Alabama localities for Rana sylvatica determined during this study. Open circles represent breeding localities; inset shows position in the state of counties from which R. sylvatica is recorded. Adult Characteristics Snout-vent lengths of adult male wood frogs in Alabama averaged 50.0 mm (SD = 5.5, N = 20), and adult females averaged 60.0 mm (SD = 3.16, N = 18). These values are smaller than those given by Martof and Humphries (1959) for wood frogs in northern Georgia and western North Carolina (males: x = 54.8 mm; females: x = 66.8 mm). Berven (1982a) discovered size differences along an altitudinal gradient from Maryland (lowland populations) to western Virginia (montane popula- tions). Mountain males and females were larger (males: x = 55.3 mm; females: x = 64.4 mm) than individuals from lowland populations (males: x = 41.7 mm; females: "x = 47.7 mm). Because Berven hypothe- sized that selection acted primarily on egg size and that selection for. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. North Carolina State Museum of Natural History. [Raleigh, NC : North Carolina State Museum of Natural History]