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Sexual dimorphism in the Snapping Turtle Chelydra serpentina

JE

Membre a labase

James E. Mosimann

Résumé du colloque

An analysis is made of sexual dimorphism in a sample of 60 snapping turtles collected in southern Quebec and Ontario during the summer of 1956. In our sample males constitute the larger sex. There is no demonstrable sexual dimorphism in shell dimensions nor in head width. The only reliable external indicator of sex found is the distance from the plastron to the cloaca. This is relatively longer in males. In turtles less than 200 mm in carapace length, this is not reliable. Maturity occurs in both males and females at about this size. The sex ratio in our sample is not significantly different from one-half.

Contexte

Section :
Biologie B
news icon Thème du colloque :
Biologie B
host icon Hôte : Université Laval

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