Seasonal variability of the karyotype structure of Chironomus plumosus (Diptera, Chironomidae) from a biotope of Kaliningrad
Petrova, N.A.; Vinokurova, N.V.; Danilova, M.V.; Maslova, V.V.
Tsitologiia 49(10): 901-905
2007
ISSN/ISBN: 0041-3771 PMID: 18074782 Document Number: 609752
Chironomus plumosus larvae from the polluted Shkolnoe lake, Kaliningrad, have 2n = 8 and 2n = 8 + 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 C 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%).