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Regulatory processes and population cyclicity in laboratory populations of Anagasta kühniella (Zeller) (lepidoptera: Phycitidae) V. Host finding and parasitization in a “small” universe by an entomophagous parasite, Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)
Author(s) -
Matsumoto B. M.,
Huffaker C. B.
Publication year - 1973
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/bf02510708
Subject(s) - lepidoptera genitalia , biology , host (biology) , parasite hosting , population density , population , zoology , dispersion (optics) , ecology , demography , physics , sociology , world wide web , computer science , optics
Summary Host finding by the entomophagous parasite, Venturia canescens ( Grav. ), parasitizing Anagasta kühniella ( Zeller ) was studied. Studies utilizing fixed densities and dispersion patterns of the hosts where no choice of density groupings was offered showed that within the experimental conditions used, host density relationships were more important than dispersion. Decreasing the time hosts were exposed to a parasite from 72 hours to 24 hours did not alter the overall parasitization. In both cases progressively less hosts were parasitized as host density increased, which exemplified a Holling ‐type of response. However, when host densities were varied within the same universe, independent of dispersion patterns, and the parasites were given a “choice” of host densities to attack, an increasing percentage of hosts in the higher host density groups were parasitized; thus a density‐dependent behavioral response was exhibited.