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Larval Survivorship in Two Populations of Ambystoma maculatum

Patrick H. Ireland
Journal of Herpetology
Vol. 23, No. 3 (Sep., 1989), pp. 209-215
DOI: 10.2307/1564441
Stable URL: http://www.jstor.org/stable/1564441
Page Count: 7
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Larval Survivorship in Two Populations of Ambystoma maculatum
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Abstract

Ambystoma maculatum egg deposition, larval growth, and larval survivorship were investigated from 1981-1985 in two ponds in Virginia. Larvae in Tate Pond were not exposed to interspecific predation whereas larvae in Quesenberry Pond were preyed on by fish. The number of hatchlings ranged from 350-638/1000 eggs and was not significantly different between the ponds. The number of eggs deposited in the ponds was not significantly correlated with the number of transformed individuals leaving the ponds. Although larval density was different between ponds, growth rates of all cohorts were similar. Larval survival was similar from year to year within each pond, but was greater after 30 days post-hatching in Tate Pond during all years. Survival at 120 days after hatching ranged from 42-125/1000 hatchlings in Tate Pond to 0-3/1000 hatchlings in Quesenberry Pond. The number of transformed individuals leaving Tate Pond ranged from 9.54-31.42/1000 hatchlings. No transformed individuals left Quesenberry Pond. Survival curves for all cohorts approximate the type II pattern.

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