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The Journal of Heredity 1986:77(5):345-348
© 1986 The American Genetic Association 77:345-348

research-article

Chromosomal analysis of insecticide resistant and susceptible mosquitofish

D. Wise, J. D. Yarbrough, and R. T. Roush

The first two authors are affiliated with the Department of Biological Sciences, Mississippi State University, Mississippi State, MS 39762; the third author is with the Department of Entomology, Mississippi State University, Mississippi State, MS 39762. They are grateful to Ms. Betty Nail for patient and accomplished technical assistance and to Ms. Brenda Wells and Ms. Amanda Dersham for help in maintenance of the mosquitofish breeding program. Ms. Rosemary Shaw and Dr. J. K. Shull made important contributions to the cytological procedures.

Abstract

The meiotic karyotypes of insecticide-resistant (R) and susceptible (S), and SR F1 mosquitofish were analyzed by preparing spread, silver-stained wholemounts of synaptonemal complexes (SC) from spermatocytes. The method reveals statistically significant differences in the relative length of certain SC's between susceptible and resistant individuals. However, careful study of SCs from SR F1 fish does not reveal detectable heterozygosity for chromosomal rearrangements. It is concluded that populations of SS and RR mosquitofish are geographically isolated and that minor karyotypIc differentiation has occurred. This differentiation may or may not be causally related to the acquisition of Insecticide resistance.


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