Nakamura Masako, Nakamura Kazuo
Department of Biology, Tokyo Metropolitan University, Fukazawa, Stagaya-ku, 158, Tokyo, Japan.
Division of Entomology, National Institute of Agricultural Sciences, Kita-ku, 114, Tokyo, Japan.
Oecologia. 1977 Jun;27(2):97-116. doi: 10.1007/BF00345816.
During the course of a 10-year investigation on the population dynamics of Dryocosmus kuriphilus, a rapid decrease in the number of individuals was noticed in the adult stage. To detect the role of predation by spiders in causing this high adult mortality, spiders collected from the survey station were tested for their reaction to Drycosmus antiserum. About 20∼50% of the spiders collected during the emergence period of D. kuriphilus reacted positively, showing that the species of Thomisidae, Argiopidae, Agelenidae and Salticidae were the important predators. The predation ratio for the total adult wasp population was estimated at 8.1% in 1968, 20.2% in 1969 and much higher in 1970, increasing with decreasing population density of the wasps. However, the predation by spiders could not account for all of the adult mortality of D. kuriphilus.
在对栗瘿蜂种群动态进行为期10年的调查过程中，发现成虫阶段个体数量急剧减少。为了探究蜘蛛捕食在导致如此高的成虫死亡率中所起的作用，对从调查站点收集的蜘蛛进行了针对栗瘿蜂抗血清反应的测试。在栗瘿蜂羽化期收集的蜘蛛中，约20%至50%反应呈阳性，表明蟹蛛科、园蛛科、漏斗蛛科和跳蛛科的物种是重要的捕食者。1968年，成年黄蜂种群的被捕食率估计为8.1%，1969年为20.2%，1970年更高，且随着黄蜂种群密度的降低而增加。然而，蜘蛛的捕食并不能解释栗瘿蜂成虫的所有死亡情况。
