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Movement and Catchability of the Hellbender, Cryptobranchus alleganiensis

Chris L. Peterson
Journal of Herpetology
Vol. 21, No. 3 (Sep., 1987), pp. 197-204
DOI: 10.2307/1564483
Stable URL: http://www.jstor.org/stable/1564483
Page Count: 8
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Movement and Catchability of the Hellbender, Cryptobranchus alleganiensis
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Abstract

Between 5 September and 7 November 1985, 21 samples were made for hellbenders in a 100 m section of the Niangua River, Missouri. Fifty-one adult males and 59 adult females were marked. Mean number of recaptures per individual was 3.0 for males and 4.8 for females. Heterogeneity of capture was strongly indicated, probably due to the tendency of some individuals to occupy the same cover consistently. This resulted in an average minimum estimate by the Jolly-Seber method of 25 males and 27 females on the 2600 m2 site. Both immigration and emigration were observed. Five to 11% of hellbenders on the site during a three-day interval may have been transients. Mean net movement upstream or downstream of 21 males and 42 females was not significantly different from 0 m/day.

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