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 language | English |
|---|---|
| Pages (from-to) | 700-708 |
| Number of pages | 9 |
| Journal | Journal of Mammalogy |
| Volume | 82 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2001 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Animal Science and Zoology
- Genetics
- Nature and Landscape Conservation
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Seasonal reproductive activity of male Formosan wood mice (Apodemus semotus) : Relationships to androgen levels. / Lee, Chi-Ying; 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 journal › Article
TY - JOUR
T1 - Seasonal reproductive activity of male Formosan wood mice (Apodemus semotus)
T2 - Relationships to androgen levels
AU - Lee, Chi-Ying
AU - Alexander, P. S.
AU - Cheng Yang, V. V.
AU - Yu, J. Y.L.
PY - 2001/1/1
Y1 - 2001/1/1
N2 - 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.
AB - 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.
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U2 - 10.1644/1545-1542(2001)082<0700:SRAOMF>2.0.CO;2
DO - 10.1644/1545-1542(2001)082<0700:SRAOMF>2.0.CO;2
M3 - Article
VL - 82
SP - 700
EP - 708
JO - Journal of Mammalogy
JF - Journal of Mammalogy
SN - 0022-2372
IS - 3
ER -