title: The Stockholm populations of Adalia bipunctata (L) (Coleoptera: Coccinellidae)--a case of extreme female-biased population sex ratio.
abstract: The genetic composition and sex ratio in the Stockholm populations of Adalia bipunctata have been studied. The overall frequency of melanics is 3.2%, which is significantly lower than in the populations of St. Petersburg and other large cities along the Baltic Sea. The secondary sex ratio in the Stockholm populations is female-biased 82:18. More than half of A. bipunctata females are infected with the male-killing Spiroplasma bacterium. Beetles of the co-existing species Adalia decempunctata are infected with a different bacterium belonging to the genus Rickettsia.
authors.affiliation: Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia. zakharov@vigg.ru
authors.forename: I A
authors.initials: IA
authors.lastname: Zakharov
authors.forename: E V
authors.initials: EV
authors.lastname: Shaikevich
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000235:genetics; D001517:Coleoptera / Q000382:microbiology* / Q000502:physiology; D018744:DNA, Plant / Q000032:analysis; D005260:Female; D008297:Male; D010858:Pigmentation / Q000235:genetics; D011679:Pupa / Q000382:microbiology; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012281:Rickettsia / Q000235:genetics / Q000302:isolation & purification; D012744:Sex Ratio; D013149:Spiroplasma / Q000235:genetics / Q000302:isolation & purification; D013548:Sweden; D013559:Symbiosis; D014921:Wings, Animal; D020577:Wolbachia / Q000235:genetics / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D018744:DNA, Plant; D012336:RNA, Ribosomal, 16S