マツノキハバチに関する生態学的研究 : III.幼虫集団の空間分布様式

概要

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The numbers of third-instar larvae of Neodiprion sertifer and colonies per red pine tree were counted over a 2,400m^2 census area in Nagano Prefecture, in 1977. The area consisted of 303 red pine trees ranging from 0.5 to 6.0 m in height. Total numbers of larvae and colonies were 16,837 individuals and 496 colonies, respectively, and the mean number of larvae per colony was 33.95 individuals. The mean numbers of larvae and colonies per tree were 55.57 individuals and 1.64 colonies, respectively. The frequency distribution of the number of colonies per tree showed evidence of overdispersion, and corresponded to a negative binomial distribution with k=0.2843. The distribution pattern of the number of larvae per tree was aggregative , and characterized by the values of two parameters, α=39.04 and β=2.515 of the m-m regression. The value of α indicated that the mean number of larvae per colony was about 40 larvae, and that of β showed the aggregated distribution pattern of the colonies. The mean colony size and the mean number of larvae per tree in the class of 2-2.9 m height were the largest, and became smaller with the increase or decrease of the tree height. The density of the colonies was the highest at the northern edge of the census area, The mechanism of the distribution pattern of colonies is discussed in relation to the oviposition behaviour of the adult female.
日本応用動物昆虫学会の論文
1982-02-25