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Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio)

Wilson Journal of Ornithology

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Abstract

We studied androgen production during development in nestling Eastern Screech-Owls (Megascops asio) and hypothesized that gender and hatch order might influence serum levels of testosterone and androstenedione. Testosterone levels were highest immediately after hatching and declined significantly in the 4 weeks leading to fledging. The average level of testosterone for 1-7 day-old owls was 3.99 - 0.68 ng/ml. At 22-28 days of age, the average testosterone level for nestling owls was 0.83 - 0.18 ng/ml. Testosterone levels did not differ between males or females. The average testosterone level for male nestlings was 2.23 - 0.29 ng/ml and 2.39 - 0.56 ng/ml for female nestlings. The average level of androstenedione for nestling owls was 1.92 - 0.11 ng/ml and levels remained constant throughout development. Levels were significantly higher in males than females. The average androstenedione level was 1.77 - 0.16 ng/ml for male nestlings and 1.05 - 0.24 ng/ml for female nestlings. Hatching order did not affect levels of either androgen. Our results provide a foundation for future studies of androgen production by nestling owls.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio)
Series title:
Wilson Journal of Ornithology
Volume
122
Issue:
4
Year Published:
2010
Language:
English
Publisher:
Wilson Ornithological Society
Publisher location:
Ann Arbor, MI
Contributing office(s):
Patuxent Wildlife Research Center
Description:
7 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wilson Journal of Ornithology
First page:
755
Last page:
761
Number of Pages:
7
Country:
United States