Experimental studies on hybridization and sexual isolation between some Aphytis species (Hymenoptera: Aphelinidae): II. Experiments on sexual isolation

Rao, S; DeBach, P

Experimental studies on hybridization and sexual isolation between some Aphytis species (Hymenoptera: Aphelinidae): II. Experiments on sexual isolation

Authors

Sudha V. Rao
Paul DeBach

Authors Affiliations

Sudha V. Rao (now Mrs. Sudha Nagarkatti) was with the Commonwealth Institute of Biological Control, Indian Station, Bellary Road, Bangalore (6), India; Paul DeBach was Professor of Biological Control, College of Biological and Agricultural Sciences, and Entomologist in the Experiment Station, Riverside.

Publication Information

Hilgardia 39(19):555-567. DOI:10.3733/hilg.v39n19p555. June 1969.

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Abstract

Sexual isolation was studied in several species and semispecies of Aphytis, aphelinid parasites of diaspine scale insects. The multiple-choice technique was used in this study, and coefficients of isolation and joint isolation were derived by using previously developed formulas. These data, in combination with other information obtained from experimental hybridization, were used to clarify the taxonomic relationships among the different species and semispecies. We have attempted to define “semispecies” in more precise terms than those previously used. Our objective was to help determine what the degree of partial reproductive isolation between two populations must be in order that they may be called semispecies with respect to each other. To achieve this, we used the coefficient of joint isolation.

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Experimental studies on hybridization and sexual isolation between some Aphytis species (Hymenoptera: Aphelinidae): I. Experimental hybridization and an interpretation of evolutionary relationships among the species