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New hormones findings from University of Alaska described.(Report)
"Crested auklets emit a citrus-like odorant that is seasonally modulated, suggesting that it is a secondary sexual trait. We hypothesized that expression of the chemical odorant is facilitated by steroid hormones, similar other secondary sexual traits in birds," scientists in the United States report (see also Hormones).
"Therefore we examined variation in concentrations of hormones in blood plasma and odor production during incubation and early chick rearing. A novel method was used to obtain and measure chemical emissions of crested auklets. Blood plasma samples were analyzed by radioimmunoassay. Progesterone was detected in all birds, and it varied during the breeding season. Octanal emmissions covaried with progesterone levels in males but not in females. No seasonal patterns were detected in testosterone, estrogen or DHT, and these hormones were not detected in all breeding adults. Covariance of progesterone and octanal emissions in mates suggests there could be at least an indirect relationship between odor emissions and steroid hormones in this species," wrote H.D. Douglas and colleagues, University of Alaska.
The researchers concluded: "Thus expression ...
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Source: HighBeam Research, New hormones findings from University of Alaska described.(Report)