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The Journal of Heredity 1988:79(4):300-303
© 1988 The American Genetic Association 79:300-303

research-article

Studies on the Crosses between the Sibling Species of the Anopheles culicifacies Complex

S. K. Subbarao, K. Vasantha, and V. P. Sharma

Malaria Research Centre (ICMR) Delhi, India

Address reprint requests to Dr. Subbarao, Malaria Research Centre (ICMR) 22, Sham Nath Marg, Delhi-110 054, India.

Abstract

Generally, the crosses carried out between the three known sibling species of the Anopheles culicifacies complex were fertile. However, when certain strains of species B were used as the female parents, the crosses were totally sterile, whereas with other strains of species B, low fertility was observed. Also, the cross between the C female and the A male was sterile. Although unidirectional hybrid male sterility was reported in crosses between species A and species B, bidirectional hybrid male sterility was observed between species A and B and also between species A and C, and bidirectional hybrid male fertility was observed in crosses between species B and C. In the sterile hybrid males, varying degrees of development of reproductive organs were observed. The hybrid females from all of the crosses were fertile. In the "choice" mating experiments species A and B exhibited assortative matings, whereas species C showed preference to mate with species B. The possible reproductive isolating mechanisms operating in the field were considered and it was concluded that ethological isolation probably is the chief operating force.


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