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Simulation of Release of Sex-Linked Translocation Homozygotes for Population Replacement

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A deterministic computer model was built to evaluate various release strategies of sex-linked translocation homozygotes for the purpose of replacement of a local population of Aedes aegypti (L.) in a Kenyan village. The model incorporated overlapping generations, density-dependent larval survivorship, mating competiveness of males for females, immigration of wild types, and the release of adults or pupae.

The results of exercising the model indicate that the immigration of wild types can prevent the achievement of total replacement of the local population and that an equilibrium translocation frequency will be reached. The particular value of the translocation frequency depends on immigration and release rates, as well as the sex of the immigrants. In the absence of immigration, and with the exception of translocation homozygous females that have not been mated to like males, selection is frequency dependent. If immigration is allowed when the release is stopped, the translocation frequency declines. The rate at which it declines depends on the immigration rate. Most of the kinds of adult releases are more efficient than release of pupae. Reduced mating competitiveness of wild males for released homozygous females has little influence on the success of releases, if females have mated to homozygous males before release. It is surmised that the high intensity of larval competition decreases the influence of mating competitiveness in both adult and pupal releases. A decrease in adult survivorship has little effect in continous releases, if translocation females have been mated to like males before release. It does increase the time in which fixation of the translocation is achieved, if adult releases are stopped or if pupae are released.

Document Type: Research Article

Publication date: June 1, 1978

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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