岡山県中部および北部におけるタヌキの年齢構成

概要

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The ages of 320 trapped raccoon dogs, <I>Nyctereutes procyonoides viverrinus</I> TEMMINCK, were determined by the cementum layer method. The animals were collected during the hunting seasons (December to January) of 1974-75 and 1975-76 in the central and north regions of Okayama Prefecture.<BR>Analysis of the age data showed the following results. There was no significant difference in the number of animals between the two sexes. The oldest was age class VI (5.5 years old) in males and age class VIII (7.5 years old) in females. Mean±standard error of ages was 1.18±0.10 years in males and 1.20±0.11 years in females; the difference of mean between the two sexes was not significant statistically. Animals in the first age class were 68.4% of the total. The present sample had lower mean ages and higher percentage of first age calss animals than in the data previously reported by other authors. These differences may be caused by hunting pressure that is specially heavy on the raccoon dog population.
日本哺乳類学会の論文