Abstract
In studies of interspecific competition of the bean weevils, Callosobruchus chinensis, and C. maculatus (Fujii, 1968; 1969), I employed the following eight geographical strains of both species: in C. chinensis, two strains collected in Kyoto, Japan, in 1936 (jC) and in 1965 (kC), a strain collected in -Iran in 1954 (iC), and a strain from Niigata Prefecture, Japan in 1964 (nC). In C. maculatus, two strains imported from the U.S.A. in 1946 (aQ) and in 1957 (cQ), a strain imported from Burma in 1954 (bQ), and a strain imported from the Near East in 1960 (tQ). For the analysis of the mechanisms of interspecific competition, I measured certain fundamental biological characteristics of each strain when cultured at 300 C. and 70% RH. Characteristics (1) through (7) as listed below are based on the means of measurements taken for individuals in each culture; those from (8) through (11) are based on counts or measurements obtained for the entire culture, during all generations of the study.
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