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A Study of the Variation of Size within two Species of Aphides

Published online by Cambridge University Press:  10 July 2009

G. H. L. Dicker  and
S. C. Pearce
G. H. L. Dicker
Affiliation:
Ministry of Agriculture Research Scholar
S. C. Pearce
Affiliation:
Assistant Statistician, East Malling Research Station, Kent.
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Extract

At least 30 specimens of each form of Macrosiphum rubiellum, Theobald, and Aphis idaei, van der Goot, were collected, mounted and their principal organs measured.

Correlations were calculated between different parts on the right side and the conclusion reached that the ratios of lengths of organs were unstable characteristics of the species examined. High correlations were obtained between the same part on different sides of the body.

The mean values and standard errors are tabulated and a method given for assigning limits of variation within a species. The standard errors obtained were of the order of 7 per cent. of the mean.

The asymmetry, kurtosis and skewness of the distributions were calculated to test the effect of possible non-normality on the foregoing work.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 31 , Issue 1 , April 1940 , pp. 45 - 56
Copyright
Copyright © Cambridge University Press 1940

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References

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