SEASONAL VARIABILITY OF THE KARYOTYPE STRUCTURE OF CHIRONOMUS PLUMOSUS (DIPTERA, CHIRONOMIDAE)
FROM A BIOTOPE OF KALININGRAD
N. A. Petrova,1 N. V. Vinokurova,2 M. V. Danilova,2
V. V. Maslova 2
1 Zoological Institute RAS, St. Petersburg, and 2 Russian Kant State University,
Kaliningrad
Chironomus plumosus larvae from the polluted Shkolnoe lake, Kaliningrad, have 2n = 8 and 2n = 8 a B.
In winter season we found 11 types of hetero- and homozygous inversions in A, B, C, D, E, and F arms whereas in
summer season we registered 7 types of the same inversions in A, B, C, D, and E arms. All inversions with exception
of the inversion in arm N correspond to Hardy-Weinberg equilibrium. The arm IVG shows homozygous increase of
centromeric heterochromatin more frequently in summer than in winter (34.4 % as compared with 1.8 %). The arm E has
asynapsis 2 times less frequently in summer than in winter (21.4 % as compared with 44.6 %).
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