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Descriptive and Ecological Notes on Natrix cyclopion in Illinois

John S. Garton, Earl W. Harris and Ronald A. Brandon
Herpetologica
Vol. 26, No. 4 (Dec., 1970), pp. 454-461
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3890770
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Descriptive and Ecological Notes on Natrix cyclopion in Illinois
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Abstract

Data on the ecology, size, scutellation, and pigmentation of 24 specimens and one newborn litter of 12 Natrix cyclopion from Illinois are given. Except for five individuals all are from the Pine Hills Swamp in Union County. Marginal habitat and abundance of Agkistrodon piscivorus probably contribute to scarcity of N. cyclopion in southern Illinois. Few Natrix of any species were found where A. piscivorus was abundant. N. cyclopion, unlike other species of Natrix, is apparently restricted in southern Illinois to Austroriparian swampland where it is ecologically sympatric with A. piscivorus. Stomachs of N. cyclopion contained Siren intermedia and sunfishes. Twelve young were born on 28 August 1969, and another female contained 14 half-term embryos on 25 July 1969.

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