Abstract
Analysis of meiotic chromosomes from hybrids betweenAedes atropalpus andAe. epactius has revealed that the two species are fixed for alternate arrangements of four inversions: a paracentric inversion of chromosome 1, two paracentric inversions of chromosome 2, and a pericentric inversion of chromosome 3. This chromosomal heterozygosity in the interspecific hybrids has resulted in extensive meiolic chromosomal asynapsis. Dicentric bridges, acentric fragments, and chromosomal breakage were also associated with the heterozygous inversions. This disruption of meiosis was sufficient to account for the partial sterility observed in interspecific hybrids. No chromosomal polymorphisms, aberrations, or reduction in fertility was observed in parental strains of intraspecific hybrids of the two species.
Similar content being viewed by others
References
Brust R A 1974 Reproductive isolation within theAedes atropalpus group, and description of egg.J. Med. Entomol. 11: 459–466
Coluzzi M, Sabatini A, Petrarca V and DiDeco M A 1979 Chromosomal differentiation and adaptation to human environments in theAnopheles gambiae complex.Trans. R. Soc. Trop. Med. Hyg. 73: 483–497
Coluzzi M and Kitzmiller J B 1975 Anopheline Mosquitoes. InHandbook of genetics (eds) R C King (New York: Plenum Press) vol. 3, pp. 285–310
Cofuzzi M, Canerini G and DiDeco M 1970 The polytene chromosomes ofAnopheles superpictus and relationships withAnopheles Stephensi.Parassitologia 12: 101–112
Craig G B Jr and VandeHey R C 1962 Genetic variability inAedes aegypti (Diptera: Culicidae). I. Mutations affecting color pattern.Ann. Entomol. Soc. Am. 55: 47–58
Dev V and Rai K S 1984 Genetics of speciation in theAedes (Stegomyia) scutellaris group (Diptera: Culicidae). V. Chromosomal relationships among five species.Genetics 64: 83–92
Grell R F 1962 A new hypothesis on the nature and sequence of meiotic events in the females ofDrosophila melanogaster.Proc. Natl. Acad. Set. USA 48: 165–172
Hartberg K W and Rai K S 1975Aedes. InHandbook of genetics (eds) R C King (New York: Plenum Press) vol. 3, pp. 311–345
Kitzmiller J B 1976 Genetics, cytogenetics, and evolution of mosquitoes.Adv. Genet. 18: 315–333
Motara M A and Rai K S 1977 Chromosomal differentiation in two species ofAedes and their hybrids revealed by giemsa C-banding.Chromosoma (Berl.) 64: 125–132
Motara M A and Rai K S 1978 Giemsa C-banding patterns inAedes (Stegomyia) mosquitoes.Chromosoma(Berl.) 70: 51–58
Newton M E, Wood R J and Southern D I 1978 Cytological mapping of theM andD loci in the mosquito,Aedes aegypti (L.).Genetica 48: 137–143
O’Meara G F and Craig G B Jr 1970 A new subspecies ofAedes atropalpus Coquillett from Southwestern United States (Diptera: Culicidae).Proc. Entomol. Soc. Washington 72: 475–479
Rai K S 1963 A comparative study of mosquito karyotypes.Ann. Entomol. Soc. Am. 56: 160–170
Rai K S 1980 Evolutionary cytogenetics of aedine mosquitoes.Genetica 52/53: 281–290
Rai K S, Pashley D P and Munstermann L E 1982 Genetics of speciation in Aedine mosquitoes. InRecent developments in the genetics of insect disease vectors (eds) W W M Steiner, W J Tabachnick, K S Rai and S Narang (Champaign, IL: Stipes) pp. 84–128
Rai K S, McDonald P T and Asman S R M 1970 Cytogenetics of two radiation-induced sex-linked translocations in the yellow-fever mosquito,Aedes aegypti.Genetics 66: 635–651
Ross H 1964 The colonization of temperate North America by mosquitoes and man.Mosq. News 24: 103–118
Sherron D A and Rai K S 1984 Genetics of speciation in theAedes (Stegomyia) scutellaris subgroup (Diptera: Culicidae). 4. Chromosomal relationships ofAedes cooki with four sibling species.Can. J Genet. Cytol. 23: 65–72
Szymczak L J, Hilburn L R and Rai K S 1986 Genetic differentiation in theAedes atropalpus complex. I. Isozyme variability and genetic distances betweenAe. atropalpus andAe. epactius. J. Genet. 65: 193–204
Taylor D B 1982Speciation in the Aedes triseriatus species complex, Ph. D. dissertation, University of Notre Dame
White M J D 1978Modes of speciation (San Fransisco: W H Freeman)
Zavortink T J 1972 Mosquito studies (Diptera: Culicidae). XXVIII. The New World species formerly placed inAedes (Finlaya).Contrib. Am. Entomol. Inst. 8: 1–206
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Szymczak, L.J., Rai, K.S. Genetic differentiation in theAedes atropalpus complex. II. Chromosomal divergence betweenAe. atropalpus andAe. epactius . J. Genet. 66, 33–44 (1987). https://doi.org/10.1007/BF02934454
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02934454