Showing papers by "Robert R. Sokal published in 1952"

Variation in a local population of pemphigus

Abstract: The purpose of this paper is to present a study of the variation of morphological characters within a local population of the aphid Pemphigus populi-tratnsversus. Twenty-one characters are analyzed statistically with a view to selecting those representative of genetic variation within the population. The characters thus selected are to be used for a study of intraspecific variation. Certain material on character interrelations is included since it is readily derived from the same data. Much work has been done in recent years on the analysis of intraspecific variation in both animals and plants. To the knowledge of the writer none of the work on animals, with the exception of that of Kinsey (1930, 1936) on Cynips, treats of partially or fully asexual or parthenogenetic forms. Kinsey's results, did not demonstrate any particular deviation in population structure for species of this genus with alternately sexual and agamic generations. As the miain emphasis of his work was not a detailed analysis of intraspecific characters, these results cannot be considered as definitive. For this reason the author thought it profitable to examine a genus of a partially parthenogenetic form to learn, what character variation and population structure in such a group would be like. The