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Functional response to host density in a parasitic wasp, with reference to population regulation
Author(s) -
Takahashi Fumiki
Publication year - 1968
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02514734
Subject(s) - host (biology) , biology , functional response , parasitism , context (archaeology) , preference , population density , population , zoology , ecology , predation , predator , statistics , demography , paleontology , mathematics , sociology
Summary The functional response to, and preference for, the host density in a parasite were examined experimentally using an icheumon wasp, Exidechthis canescens , and its host Cadra cautella under controlled conditions. Wasps were more active in host‐searching at higher than lower host densities. Percent parasitism increased rapidly with initial increments in host density and then tended to increase more slowly at higher host densities. A sigmoid functional response curve is indicated, which implies that the parasite is able to control its host even at low densities. Wasps actively selected areas of high host density in which to concentrate host‐searching behavior. Host‐searching by E. canescens is stimulated by the odor of the host when present, and by food in which hosts have developed but have been removed. Both the functional response and the host‐density preference of the parasite are mediated by its host‐searching behavior. This relationship is discussed in the context of population regulation.