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Chromosomal polymorphism of Chironomus plumosus (Linnaeus, 1758) (Diptera: Chironomidae) from Bulgaria (Pazardjik region) and the Czech Republic (Ceske Budejovice region)

Michailova P., Krastanov B., Matena J.

Abstract. Chromosomal polymorphism of Chironomus plumosus (L.) from two geographically isolated populations is studied. Both populations revealed clear differences in their polymorphism. The Czech population is characterized by a low level of chromosome polymorphism. The karyotype of C. plumosus in this population differs from that of the Bulgarian population by the monomorphism of arms B, D, E, F and G and a low level of hetero- and homozygous states in arms A and C respectively. Nine sequences which range 9 genotypic combinations were found in this population. The high frequency of genotypic combination pluC1.1 would suggest it has selective value in this population. The studied Bulgarian population revealed a high level of chromosome polymorphism. Thirteen banding sequences and 16 genotypic combinations were observed in the region stud-ied. In arms A, C, D alternative homozygous sequences and heterozygous between them were detected. They are adapted to different environmental components.