Effect of exogenous estradiol applied at different embryonic stages on sex determination, growth, and mortality in the leopard gecko (Eublepharis macularius)

Wiley - Tập 268 Số 1 - Trang 17-21 - 1994
Alan Tousignant1, David Crews
1Institute of Reproductive Biology, University of Texas, Austin 78712.

Tóm tắt

AbstractTemperature‐dependent sex determination (TSD) occurs in three orders of reptiles. Several studies have examined the ability of estradiol to produce female hatchlings incubated at a male‐producing temperature. The results of these experiments support the idea that estradiol could be used as a powerful tool in the conservation of endangered species with TSD by manipulating hatchling sex ratios. However, these experiments have concentrated on the mechanism of determination. This experiment was designed to test the efficacy of various dosages of estradiol applied at two different stages to alter the hatchling sex ratio as well as determining the potential use of such manipulation for conservation efforts by monitoring egg mortality and hatchling growth. The leopard gecko (Eublepharis macularius) exhibits TSD and reaches reproductive maturity in less than one year, making it an excellent model for evaluating the long‐term effects of estradiol. The results demonstrate that estradiol has a dose‐dependent effect on the hatchling sex ratio while only high dosages applied at the later stage of development showed increased mortality. Estrogen‐determined females grew at the same rate as temperature‐determined females and have produced viable hatchlings. Estradiol treatment of eggs from endangered species may provide a method of insuring female offspring when the TSD pattern is unknown or equipment for controlled incubation is unavailable. © 1994 Wiley‐Liss, Inc.

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Tài liệu tham khảo

10.1016/0016-6480(88)90117-7

10.1016/0016-6480(91)90162-Y

10.1016/0016-6480(89)90042-7

Dufaure J. P., 1961, Table de développement du lézard vivipare: Lacerta (Zootoca) vivipara Jacquin, Arch. Anat. Microsc. Morphol. Exp., 50, 309

10.1016/0016-6480(86)90070-5

10.1016/0016-6480(88)90254-7

Pieau C., 1974, Différenciation du sexe en fonction de la température chez les embryons d'Emys obicularis L. (Chélonien). Effets des hormones sexuelles, Ann. Embryol. Morphol., 7, 365

Raynaud A., 1985, Biology of the Reptilia, 149

10.1002/jez.1402600311

10.1002/jez.1402600117

10.1002/jez.1402620413

10.1111/j.1432-0436.1993.tb00703.x

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Thông tin xuất bản

Wiley

Tập 268 Số 1

17-21

Thông tin tác giả