Document Detail

Temperature-sensitive periods of sex determination in Emydid turtles.
MedLine Citation:
PMID:  7338727     Owner:  NLM     Status:  MEDLINE    
In many turtles sex differentiation is controlled by the incubation temperature of the embryo, with low temperatures producing males, high temperatures producing females. This study investigates the developmental period of temperature-sensitivity in two species of emydid turtles, using different combinations of incubation at a male-determining temperature (25 degrees C) and at a female-determining temperature (31 degrees C). The sensitive period extends throughout much of the middle third of development. Sex is more readily influenced by 25 degrees than by 31 degrees, however, so that maleness can be determined much earlier in development than can femaleness. Comparison of these results with a previous study of snapping turtles indicates that the sensitive period occupies somewhat the same developmental interval in these different turtles. However, in snapping turtles, the female-determining temperature used (30 degrees) is more influential than the male-determining temperature (26 degrees), in contrast with these results from emydids.
J J Bull; R C Vogt
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of experimental zoology     Volume:  218     ISSN:  0022-104X     ISO Abbreviation:  J. Exp. Zool.     Publication Date:  1981 Dec 
Date Detail:
Created Date:  1982-06-14     Completed Date:  1982-06-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375365     Medline TA:  J Exp Zool     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  435-40     Citation Subset:  IM    
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MeSH Terms
Sex Differentiation*
Turtles / embryology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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