KARYOFUNDS OF CHIRONOMUS PLUMOSUS (L.) (DIPTERA, CHIRONOMIDAE).
V. TERMINAL AND INTERSTITIAL POPULATIONS
N. A. Shobanov, V. V. Bolshakov
Institute for Biology of Inland Waters RAS, Borok, Yaroslavl Region;
e-mail: shobanov@ibiw.yaroslavl.ru,
victorb@ibiw.yaroslavl.ru
The study of polytene chromosomes of Chironomus plumosus from Rybinsk reservoir, its inflows and surrounding
water bodies allow to mark out two type's of population. Terminal populations - presented by karyoforms
with concrete limited composition of genotype combinations and zygotic arm combinations, which adapted
to specific complex of the habitat factors. The immediate exchange of genes between different terminal populations
is absent (even they placed in nearness) from allochronie of life cycles and impossibility of
larvae-immigrants to finish ontogenesis in unfit for they habitat conditions. Interstitial populations inhabit the
biotopes, where the karyoforms of two or more terminal populations can to finish ontogenesis and to reproduce.
The genetic exchange between terminal population implement through interstitial populations.
Key words: Chironomus plumosus, polytene chromosomes, karyofund, karyoforms, populations
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