北海道東部地方のキタキツネの齢構成 A PRELIMINARY STUDY OF THE AGE STRUCTURE OF THE RED FOX IN EASTERN HOKKAIDO
The age composition of 362 red foxes, Vulpes vulpes shrencki KISHIDA, which were collected in eastern Hokkaido during the autumn and winter of 1970-1973,was determined by examination of the annual layers of canine tooth cementum and the fusion of the cranial sutures. The average percentage of individuals younger than 1 year old was 67% during the three-year study period. Some of the red foxes survived longcr in eastern Hokkaido than in other districts. The survivorship curve was estimated for the population surveyed.
日本生態学会誌 30(2), 103-108, 1980