クワゴマダラヒトリの捕食者オオヨツアナアトキリゴミムシの捕食戦略 : 餌密度に対する反応および摂食量と成長量の関係

概要

論文の詳細を見る
Foraging strategies of a monophagous predator were investigated in the laboratory using a carabid beetle, P. perforata inhabiting colonial nest webs of S. imparilis. As hatchlings of this predator develop into 3rd instar larvae in the nest webs without moving among trees, it is essential that the predators effectively consume limited prey resources to maintain their own population, The functional responses of larvae showed what is called Holling's Type 2. Prey consumption in 3rd instar larvae was far more than in 1st and 2nd instar larvae. The predator larvae (1st, 2nd and 3rd instar) were able to feed on any kind of instar larvae of prey from the 1st to 4th larval stages. However, it was found that at some ages prey consumption was inadequate by analyzing the parameters of the disc equations. A small predator larva (1st instar) could not capture a large prey (4th instar) successfully and a large larva (3rd instar) could not gain enough food for growth when the prey was small (2nd instar). If adult predator females deposit eggs and 4th instar larval stages of S. imparilis, it is supposed that predator larvae feed on inadequate preys. However, in natural habitats there were no observations of such cases.
日本生態学会の論文
1984-12-30