Annual reproductive cycle of the Formosan wood mouse, Apodemus semotus

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

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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
Volume36
Issue number1
Publication statusPublished - 1997 Jan 1

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

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