Variation in Coccus hesperidum L. (Homoptera: Coccidae)

Abstract

SYNOPSISAn account is given of variation in 18 characters in a number of females taken from a homogeneous population of Coccus hesperidum. The latent roots and vectors obtained from the correlation matrix of these characters are discussed and an interpretation of the vectors is given.

A multivariate analysis of postembryonic growth in two species of Ectobius (Dictyoptera: Blattidae)

“…This is particularly true when the sexes are considered separately but less so for the pooled data. Blair, Blackith & Boratynski (1964) also found a rather small proportion of significant correlation coefficients in Coccus hesperidum-about one-third of the 152 computed. They point out that because of this, the subsequent analysis reveals a rather large number of important orthogonal axes of variation.…”

“…As indicated above, the multivariate analysis of growth-patterns has often been approached through the characterization of the form of a single growth-stage (usually the adult), coupled with inferences as to the interlocking developmental processes which must have contributed towards the production of the stage analysed. Blackith (1965) has reviewed this method of "morphometric analysis" and a good example of its use is a study by Blair, Blackith & Boratynski (1964) of the adult female of Coccus hesperidum. By forming a correlation matrix from data on the dimensions of 18 structures and extracting the latent roots and vectors of this matrix they demonstrated the existence of eight uncorrelated modes of variation, which they then attributed to the operation during development of the same number of independent growth-patterns.…”