Abstract

Body size, growth, and reproduction of Emydoidea blandingii from several localities in western Nebraska were investigated. Female carapace length averaged 209.2 mm (214.8 mm for those known to be sexually mature). Adult male carapace length averaged 200.8 mm and was not significantly different from that of females, but males had pigmented tomia. Covariance analysis using carapace length as a covariate revealed that females had a significantly longer plastron and higher shell than males. Turtles showed a 70.1% increase in length of the left abdominal scute during the 1st year. Growth declined rapidly and became more constant about the 4th year (about 4–9% per year). Clutch size averaged 14.9, clutch wet mass averaged 168.5 g, and egg wet mass averaged 11.82 g. No measure of reproductive output (i.e., clutch size, clutch wet mass, relative clutch mass) or egg size (relative egg mass, egg wet mass, egg length, or egg width) was significantly correlated with maternal carapace length. Comparisons with other populations of E. blandingii are made.

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