A mechanistic model of temperature-dependent sex determination in a chelonian: the European pond turtle
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منابع مشابه
Nest Temperature Is Not Related to Egg Size in a Turtle with Temperature-Dependent Sex Determination
A recent hypothesis posits that temperature-dependent sex determination (TSD) in reptiles may be maintained if females can assess thermal conditions and lay eggs accordingly to produce the sex benefiting most from maternal investment. Specifically, females should lay large eggs in environments likely to produce the sex benefiting most from larger egg size. This relationship has been demonstrate...
متن کاملField-measured heritability of the threshold for sex determination in a turtle with temperature-dependent sex determination
Problem: For temperature-dependent sex determination to respond to selection, there should be genetic variance underlying the threshold that switches development from a male-producing program to a female-producing program. Genetic variance for this threshold in reptiles has never been estimated under field conditions. Methods: We estimated variance components of the thermal sensitivity of the s...
متن کاملSex reversal and aromatase in the European pond turtle: treatment with letrozole after the thermosensitive period for sex determination.
In the European pond turtle (Emys orbicularis), gonadal sex differentiation is temperature-dependent. The temperature sensitive period (TSP) of gonadogenesis lies between stages 16 and 22 of embryonic development. Previous studies have shown that embryos incubated at 30 degrees C, a temperature yielding 100% phenotypic females, can be sex reversed by treatments with an aromatase inhibitor admin...
متن کاملA Novel Candidate Gene for Temperature-Dependent Sex Determination in the Common Snapping Turtle.
Temperature-dependent sex determination (TSD) was described nearly 50 years ago. Researchers have since identified many genes that display differential expression at male- vs. female-producing temperatures. Yet, it is unclear whether these genes (1) are involved in sex determination per se, (2) are downstream effectors involved in differentiation of ovaries and testes, or (3) are thermo-sensiti...
متن کاملInheritance of nesting behaviour across natural environmental variation in a turtle with temperature-dependent sex determination.
Nesting behaviour is critical for reproductive success in oviparous organisms with no parental care. In organisms where sex is determined by incubation temperature, nesting behaviour may be a prime target of selection in response to unbalanced sex ratios. To produce an evolutionary change in response to sex-ratio selection, components of nesting behaviour must be heritable. We estimated the fie...
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ژورنال
عنوان ژورنال: Functional Ecology
سال: 2007
ISSN: 0269-8463,1365-2435
DOI: 10.1111/j.1365-2435.2007.01349.x