| the stockholm populations of adalia bipunctata (l) (coleoptera: coccinellidae)--a case of extreme female-biased population sex ratio. | 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 ... | 2001 | 11833290 |