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Research paper thumbnail of Interactions among endocrinology, seasonal reproductive cycles and the nesting biology of the female green sea turtle

Marine Biology, 2002

We collected data on plasma levels of testosterone+5a-dihydrotestosterone (T+DHT) and corticoster... more We collected data on plasma levels of testosterone+5a-dihydrotestosterone (T+DHT) and corticosterone (CORT) from adult female green sea turtles (Chelonia mydas) from southern Queensland during distinct stages of their reproductive cycle. Those females capable of breeding in a given year had elevated plasma steroid levels (T+DHT 0.91±0.08; CORT 1.05±0.29 ng/ml), associated with follicular development, until courtship began in October. At the beginning of the nesting season in November plasma levels of CORT were related to when the female first nested (r 2=0.06; F=10.45; P=0.01). However, they were not correlated with the number of clutches a female laid in that season (F=3.65; P=0.08). We repeatedly sampled 23 turtles over the nesting season and profiled changes in steroids immediately following oviposition of each clutch. Levels of T+DHT (range 0.41–0.58 ng/ml) and CORT (range 2.13–2.81 ng/ml) were similar through the early stages of the nesting season and inter-nesting period, and ...

Research paper thumbnail of Interactions among endocrinology, seasonal reproductive cycles and the nesting biology of the female green sea turtle

Marine Biology, 2002

We collected data on plasma levels of testosterone+5a-dihydrotestosterone (T+DHT) and corticoster... more We collected data on plasma levels of testosterone+5a-dihydrotestosterone (T+DHT) and corticosterone (CORT) from adult female green sea turtles (Chelonia mydas) from southern Queensland during distinct stages of their reproductive cycle. Those females capable of breeding in a given year had elevated plasma steroid levels (T+DHT 0.91±0.08; CORT 1.05±0.29 ng/ml), associated with follicular development, until courtship began in October. At the beginning of the nesting season in November plasma levels of CORT were related to when the female first nested (r 2=0.06; F=10.45; P=0.01). However, they were not correlated with the number of clutches a female laid in that season (F=3.65; P=0.08). We repeatedly sampled 23 turtles over the nesting season and profiled changes in steroids immediately following oviposition of each clutch. Levels of T+DHT (range 0.41–0.58 ng/ml) and CORT (range 2.13–2.81 ng/ml) were similar through the early stages of the nesting season and inter-nesting period, and ...

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