Plasma testosterone levels of incubating black-tailed gulls

Kentaro Kazama*, Kentaro Q. Sakamoto, Yutaka Watanuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)112-116
Number of pages5
JournalJournal of the Yamashina Institute for Ornithology
Issue number2
Publication statusPublished - 2007
Externally publishedYes


  • Black-tailed gull
  • Incubation
  • Individual variation
  • Plasma
  • Testosterone

ASJC Scopus subject areas

  • Animal Science and Zoology


Dive into the research topics of 'Plasma testosterone levels of incubating black-tailed gulls'. Together they form a unique fingerprint.

Cite this