Plasma Testosterone Levels of Incubating Black-tailed Gulls

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  • Kazama Kentaro
    Laboratory of Marine Ecology, Graduate School of Fisheries Sciences, Hokkaido University
  • Q. Sakamoto Kentaro
    Laboratory of Toxicology, Graduate School of Veterinary Medicine, Hokkaido University
  • Watanuki Yutaka
    Laboratory of Marine Ecology, Graduate School of Fisheries Sciences, Hokkaido University

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  • 抱卵期におけるウミネコの血漿テストステロン濃度
  • ホウランキ ニ オケル ウミネコ ノ ケッショウ テストステロン ノウド

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Abstract

In some avian species, male plasma testosterone levels are maximum during the courtship or copulation periods, but decline abruptly once incubation starts. However, testosterone levels of male Black-tailed Gulls Larus crassirostris during the course of breeding remain unknown. In 2006, blood samples of 23 incubating males were collected at Rishiri Island, Hokkaido, Japan and testosterone was measured by enzyme immunoassay kit. Plasma testosterone level (mean±S.E.: 0.737±0.282 ng/ml) was assumed to decline with elapsed days from the onset of incubation, as shown in other species.

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