Annual reproductive cycle of the Formosan wood mouse, Apodemus semotus

Bu Miin Huang, Liang Kong Lin, Paul S. Alexander

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11 Citations (Scopus)


The annual reproductive pattern of Apodemus semotus was studied. A. semotus specimens were trapped at monthly intervals from October 1984 through March 1986 at about 2 300 m elevation in the Hohuanshan area of central Taiwan (24° latitude). Reproductive parameters of 267 mice were measured. Seasonal changes in weights of male gonads showed peaks in April-May and September-October, whereas gonadal weights were sharply reduced and there was histological evidence of regression in June-July and December-February. Ovarian monthly mean weights also showed 2 peaks in April and September. Pregnant or lactating females were found in April-May and August-December. Breeding was more frequent in autumn than in spring. The mean litter size of 23 pregnant mice was 3.83 ± 0.88 (range 2-6). The difference between litter size and ovulation rate (4.24 ± 0.22) indicates that prenatal mortality was 12.8%, including 7.5% pre-implantation mortality and 5.3% post-implantation mortality. No more than 2 sets of placental scars were found in any individual. Analyses of age structure and the time of appearance of juveniles give further evidence of a bimodal annual reproductive pattern for A. semotus.

Original languageEnglish
Pages (from-to)17-25
Number of pages9
JournalZoological Studies
Issue number1
Publication statusPublished - 1997 Jan 1

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

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