Abstract
Ambystoma annulatum is a salamander endemic to the Interior Highlands of Missouri, Arkansas, and Oklahoma, depositing eggs in ponds in small, loose masses. Mass breeding migrations occur on rainy nights as in many members of the family Ambystomatidae, but they occur in late summer to early fall (Trapp, 1956, 1959; Spotila and Beumer, 1970; Hutcherson et al., 1989) rather than in late winter to early spring. Peterson et al. (1991) estimated that 150 to 230 A. annulatum oviposited in each of two ponds in Stone County, Missouri, in 1988, based only on an estimate of the number of eggs in the ponds and an average clutch size of 390 ova determined by Hutcherson et al. (1989). The purpose of this study was to determine if that estimate of the number of fe-
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