Seasonal reproductive activity of male Formosan wood mice (Apodemus semotus): Relationships to androgen levels

C. Y. Lee, P. S. Alexander, V. V. Cheng Yang, J. Y.L. Yu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The annual reproductive cycle of adult male Formosan wood mice (Apodemus semotus) collected monthly from the Alishan area, Taiwan, was investigated. Mean monthly body mass varied between 25.0 g ± 0.8 SE and 27.1 ± 1.3 g and did not show significant seasonal change. Mass of reproductive organs, spermatogenic activity, and levels of testicular and plasma androgen exhibited a distinct pattern of seasonal change. Testes, epididymides, and seminal vesicles were lightest and spermatogenesis was virtually arrested in January and December. For the remainder of year, all animals examined were spermatogenically active. However, spermatogenic activity was most intense and reproductive organs were heaviest in March-April and August-September. A decline occurred in mass of reproductive organs and diameter of seminiferous tubules in May-July, but spermatogenesis was unaffected qualitatively. Levels of testicular and plasma androgen were elevated in March-April and August-September, coinciding with periods of intense spermatogenic activity and the heaviest reproductive organs and were significantly correlated with mass of testes, epididymides, and seminal vesicles, and diameter of seminiferous tubules. Day length and temperature, but not precipitation, were correlated with mass of testes, epididymides, and seminal vesicles. This is the 1st study to investigate seasonal patterns of androgen levels in plasma and testes in the genus Apodemus.

Original languageEnglish
Pages (from-to)700-708
Number of pages9
JournalJournal of Mammalogy
Volume82
Issue number3
DOIs
Publication statusPublished - 2001 Jan 1

Fingerprint

Murinae
Apodemus
androgen
androgens
Androgens
Testis
Seminal Vesicles
Epididymis
vesicle
seminal vesicles
gonads
epididymis
testes
Seminiferous Tubules
Spermatogenesis
plasma
seminiferous tubules
spermatogenesis
day length
reproductive cycle

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Animal Science and Zoology
  • Genetics
  • Nature and Landscape Conservation

Cite this

Lee, C. Y. ; Alexander, P. S. ; Cheng Yang, V. V. ; Yu, J. Y.L. / Seasonal reproductive activity of male Formosan wood mice (Apodemus semotus) : Relationships to androgen levels. In: Journal of Mammalogy. 2001 ; Vol. 82, No. 3. pp. 700-708.
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Seasonal reproductive activity of male Formosan wood mice (Apodemus semotus) : Relationships to androgen levels. / Lee, C. Y.; Alexander, P. S.; Cheng Yang, V. V.; Yu, J. Y.L.

In: Journal of Mammalogy, Vol. 82, No. 3, 01.01.2001, p. 700-708.

Research output: Contribution to journalArticle

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