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Competitive displacement: extinction of the yellow scale, Aonidiella citrina (Coq.) (Homoptera: Diaspididae), by its ecological homologue, the California red scale, Aonidiella aurantii (Mask.) in Southern California

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  • DeBach, Paul
  • Hendrickson, Robert M.
  • Rose, Mike

Abstract

Discussion, historical data, and laboratory experiments are used to show that competitive displacement may occur even when there are no apparent shortages of requisites or direct aggression between ecological homologues. The final determinant is a relative difference in effective progeny production, R (as modified or even reversed by other environmental factors—such as natural enemies). These concepts are opposed to those of (Huffaker and Laing (1972)) who consider “escape from natural enemies” or the effects of other extrinsic factors as resources or requisites.

Suggested Citation

  • DeBach, Paul & Hendrickson, Robert M. & Rose, Mike, 1978. "Competitive displacement: extinction of the yellow scale, Aonidiella citrina (Coq.) (Homoptera: Diaspididae), by its ecological homologue, the California red scale, Aonidiella aurantii (Mask.) in Sout," Hilgardia, California Agricultural Experiment Station, vol. 46(1).
    • Handle: RePEc:ags:hilgar:381618
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    File URL: https://ageconsearch.umn.edu/record/381618/files/v46n01p001.pdf
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