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Effects of incubation temperatures on sexual differentiation in the turtle, Chelydra serpentina
Author(s) -
Yntema C. L.
Publication year - 1976
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051500212
Subject(s) - chelydra , biology , hatching , incubation , oviduct , sexual differentiation , turtle (robot) , ovary , gonad , anatomy , endocrinology , zoology , ecology , biochemistry , gene
Eggs of the common snapping turtle, Chelydra serpentina , were incubated at constant temperatures ranging from 20°C to 30°C, At hatching, the oviducts were absent or incomplete in males; the testes were differentiated. In females at hatching, the oviduct was intact hut in some cases the gonad retained bisexual characteristics. Three months after hatching, the ovary was differentiated and contained follicles. Eggs incubated at 20°C and at 30°C developed into females in 100% of the cases. At 26°C, 99% of the individuals were males; at 24°C, 100% were males. More males than females developed at incubation temperatures of 22°C and 28°C.