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Population Structure and Survivorship in the Painted Turtle, Chrysemys picta

J. Whitfield Gibbons
Copeia
Vol. 1968, No. 2 (Jun. 5, 1968), pp. 260-268
DOI: 10.2307/1441752
Stable URL: http://www.jstor.org/stable/1441752
Page Count: 9
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Population Structure and Survivorship in the Painted Turtle, Chrysemys picta
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Abstract

The population structure and survivorship were determined for the painted turtle, Chrysemys picta, in a southwestern Michigan marsh. More than 1000 turtles were marked and released during the study. Age of older individuals was estimated on the basis of age-length relationships. Slightly more than half of the population was estimated to be comprised of immature individuals. The adult sex ratio was not significantly different from 1: 1. The survivorship curve for the study population is a combination of Slobodkin's Types IV and III, with egg mortality being close to 100%, juvenile mortality being close to 0, and adult mortality being constant and independent of age. Contrary to popular belief, juvenile Chrysemys recruited into the population have an extremely high survival rate and will usually live to reach maturity.

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