In Oman, a comprehensive study of the annual reproductive cycles of male and female house geckos, Hemidactylus flaviviridis was conducted. Circulating testosterone (T), oestradiol (E2) and progesterone (P) concentrations were measured using a sensitive HPLC-MS/MS detection technique. Data were collected from a natural population over two consecutive seasons. The annual patterns of circulating concentrations of T, E2 and P were measured for both sexes. In males, peak plasma T, E2 and P concentrations occurred in the active phase, coinciding with the stages of spermatogenesis, courtship and mating, but gradually declined in the second half of the mating period with a significant drop in the quiescent phase, coinciding with testicular regression. In females, elevated plasma E2 and T concentrations in the active phase were associated with vitellogenesis and mating. Plasma E2 concentrations decreased significantly during the quiescent phase, coinciding with follicular regression. Plasma P concentrations were elevated during gravidity but fell significantly prior to oviposition.

In Oman, a comprehensive study of the annual reproductive cycles of male and female house geckos, Hemidactylus flaviviridis was conducted. Circulating testosterone (T), oestradiol (E2) and progesterone (P) concentrations were measured using a sensitive HPLC-MS/MS detection technique. Data were co...