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Accueil du site → Master → Etats Unis → 1965 → The reproductive cycle of the Western whiptail lizard (Cnemidophorus tigris Baird and Girard) at Tucson, Arizona

University of Arizona (1965)

The reproductive cycle of the Western whiptail lizard (Cnemidophorus tigris Baird and Girard) at Tucson, Arizona

Goldberg, Stephen R.

Titre : The reproductive cycle of the Western whiptail lizard (Cnemidophorus tigris Baird and Girard) at Tucson, Arizona

Auteur : Goldberg, Stephen R.

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1965

Résumé
Males and females of Cnemidophorus tigrls were collected during the active months of an entire year. Histological sections of testes and ovaries were examined. The males of Cnemidophorus tigrls at Tucson, Arizona follow a seasonal reproductive cycle in which gonadal size is minimal in September-October. After emerging from hibernation in March- April, there is increase in the size of the testis, height of the seminiferous epithelium, and diameter of the seminiferous tubule. Maximum size is reached in June-July, followed by rapid regression. Ovaries undergo a period of heavy yolk deposition from early April to May and remain functional until August, toe to two clutches of eggs are laid a year. A one to one ratio was noted between number of corpora lutea observed and number of oviducual eggs present. Data suggest that some of the lizards born in early August become sexually mature the following spring.

Mots clés : Aspidoscelis tigris — Reproduction. ; Lizards — Arizona.

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