Sex Ratio and Male Killing
in Siberian Populations of Harmonia axyridis Pall.

I. A. Zakharov1, N. S. Zinkevich1, E. V. Shaikevich1, L. V. Vysotskaya2,
Ch. M. Dorzhu
3, and M. E. N. Majerus4

1 Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, 117809 Russia;
fax: (095) 135-12-89; e-mail:
2 Department of Cytology and Genetics, Novosibirsk State University, Novosibirsk, 630090 Russia
3 Department of General Biology, Tuva State University, Kyzyl, 667000, Tuva Republic, Russia
4 Department of Genetics, University of Cambridge, Cambridge, Downing St., CB2 3EN UK

Received October 26, 1998; in final form, December 22, 1998

Abstract—In populations of Harmonia axyridis Pall. from Novosibirsk and Kyzyl, females (three out of 34
studied) that produce exclusively female progeny were found. In one of the families studied, the inheritance of
the male-killing trait was monitored over five generations. The male-killing trait was maternally inherited. The
beetles of this family were infected with the bacteria that, according to the sequence analysis of the gene frag-
ment for16S rRNA, belong to the genus Spiroplasma (VI group).

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