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SPATIAL PATTERN OF THE IMMATURE STAGES AND TENERAL ADULTS OF PHYLLOPHAGA SPP. (COLEOPTERA: SCARABAEIDAE) IN A PERMANENT MEADOW

Published online by Cambridge University Press:  31 May 2012

J. C. Guppy  and
D. G. Harcourt
J. C. Guppy
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa
D. G. Harcourt
Affiliation:
Entomology Research Institute, Canada Department of Agriculture, Ottawa
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Abstract

Random counts of the white grubs, Phyllophaga fusca Froelich and P. anxia LeConte, in a permanent meadow did not conform to the Poisson distribution, there being an excess of uninfested and highly infested sample units over the expected number. But when the negative binomial series was fitted to the observed distribution, the discrepancies were not significant when tested by chi-square. Using a common k, the distribution of the various stages may be described by expansion of (q-p)−k, when values of k are as follows: egg 0.15, first instar 0.41, second instar 1.30, third instar 2.00, pupa 1.62, teneral adult 1.30. Aggregation resulted from the clumping of eggs at oviposition, and randomness increased with dispersal of the larvae. For all stages, the variance was proportional to a fractional power of the mean. Three transformations are offered for stabilizing the variance of field counts.

Type
Research Article
Information
The Canadian Entomologist , Volume 102 , Issue 11 , November 1970 , pp. 1354 - 1359
Copyright
Copyright © Entomological Society of Canada 1970

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References

Anscombe, F. J. 1948. The transformation of Poisson, binomial and negative binomial data. Biometrika 35: 246–254.CrossRefGoogle Scholar
Anscombe, F. J. 1949. The statistical analysis of insect counts based on the negative binomial distribution. Biometrics 5: 165–173.10.2307/3001918CrossRefGoogle ScholarPubMed
Davis, J. J. 1919. Contribution to a knowledge of the natural enemies of Phyllophaga. Illinois Nat. Hist. Surv. Bull. 13: 53–138.CrossRefGoogle Scholar
Forbes, S. A. 1907. On the life-history, habits, and economic relations of the white-grubs and May-beetles. Illinois Agric. Exp. Stn Bull. 116: 447–480.Google Scholar
Hammond, G. H. 1948. The distribution, life-history and control of Phyllophaga anxia LeC. in Quebec and Ontario. Scient. Agric. 28: 403–416.Google Scholar
Hammond, G. H. 1949. Soil pH and intensity of Phyllophaga infestations. 79th Ann. Rep. ent. Soc. Ont., pp. 13–18.Google Scholar
Hammond, G. H. 1954. Long-term fluctuations in populations of white grubs (Phyllophaga spp.) in sod in eastern Ontario. Emp. J. exp. Agric. 22: 59–64.Google Scholar
Harcourt, D. G. 1963. Population dynamics of Leptinotarsa decemlineata (Say) in eastern Ontario. I: Spatial pattern and transformation of field counts. Can. Ent. 95: 813–820.CrossRefGoogle Scholar
Harcourt, D. G. 1965. Spatial pattern of the cabbage looper, Trichoplusia ni, on crucifers. Ann. ent. Soc. Am. 58: 89–94.CrossRefGoogle Scholar
Healy, M. J. R., and Taylor, H. R.. 1962. Tables for power-law transformations. Biometrika 49: 557–559.10.1093/biomet/49.3-4.557CrossRefGoogle Scholar
Ives, W. G. H., and Warren, G. L.. Sequential sampling for white grubs. Can. Ent. 97: 596–604.CrossRefGoogle Scholar
Morris, R. F. 1955. The development of sampling techniques for forest insect defoliators, with particular reference to the spruce budworm. Can. J. Zool. 33: 225–294.10.1139/z55-015CrossRefGoogle Scholar
Ritcher, P. O. 1940. Kentucky white grubs. Kentucky Agric. Exp. Bull. 401: 71–157.Google Scholar
Sweetman, H. L. 1931. Preliminary report on the physical ecology of certain Phyllophaga. Ecology 12: 401–422.CrossRefGoogle Scholar
Taylor, L. R. 1961. Aggregation, variance and the mean. Nature (Lond.) 189: 732–735.CrossRefGoogle Scholar
Wadley, F. M. 1950. Notes on the form of distributions of insect and plant populations. Ann. ent. Soc. Am. 43: 581–589.10.1093/aesa/43.4.581CrossRefGoogle Scholar