捕食がもたらす被捕食者の分布の変化 I : 攻撃回数の分布

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書誌事項

タイトル別名
  • Changes of Distribution Patterns of Prey Population Caused by Predation
  • 捕食がもたらす被捕食者の分布の変化
  • ホショク ガ モタラス ヒホショクシャ ノ ブンプ ノ ヘンカ 1 コウゲキ カイスウ ノ ブンプ
  • I. Homogeneity of Predator's Ability to Attack Prey
  • I. 攻撃回数の分布

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説明

A predatious bug, Podisus maculiventris, impaled a prey, whether living or dead, with its proboscis and then proceeded to suck prey's juice. a single attack by a predator was sufficient to kill the prey. Two individuals of Galleria mellonella and one of P. maculiventris were placed in each of 208 petri-plates. The number of killed prey in each petri-plate was counted after 23hr, and a frequency distribution of the number of deaths was constructed. Based on this frequency distribution, a statistical model describing a theoretical distribution of the number of deaths of prey was built up. In the model the average ability of attacks and the variation in the ability of attacks of the predators were incorporated. The following results were obtained: 1) The number of prey deaths was expected to increase concomitantly with an increase of the frequency of predator's attacks. In this case there was no proportional increase in prey deaths with the increase in the frequency of attack or in the number of predators, because the predators attacked not only living prey but also dead ones. 2) The more homogeneous the predator's ability of attack, the more prey were killed by the predator population. This relationship between prey and predators may be more important in some case than the first result.

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