Ecology of gall-forming Lepidoptera on Tetradymia: II. Plant stress effects on infestation intensity
Author AffiliationsHollister Hartman was formerly research assistant with the Population Biology Program, Department of Entomology, University of California, Riverside, is with TRW, Ballistic Missiles Division, P.O. Box 1310, San Bernardino, CA 92402.
Hilgardia 52(3):17-27. DOI:10.3733/hilg.v52n03p011. February 1984.
Hypothesized differential genotypic galling susceptibility of Tetradymia stenolepis Greene 1885 was not confirmed by tests of correlations between sample size and sample variance in plant-mean densities of Scrobipalpa n. sp. leaf galls and Gnorimoschema tetradymiella Busck 1903 stem galls. An alternate conceptual model, the stress-heterogeneity hypothesis, received support. The greater the stress experienced by a plant subpopulation, the more discontinuous was the frequency distribution of its plant-mean gall abundance. Also according to the model, gall formation increased with stress until a physiological threshold was exceeded, after which it dropped precipitously. Covariance analysis enabled comparisons among plots. Encounter frequency and resource density were also implicated in predicting plant-mean and branch-mean gall densities.
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