Differentiation of Harmonia axyridis Pall. according to polymorphic morphological traits and variability of the mitochondrial COI gene

Abstract

The geographic variability of Harmonia axyridis Pall. has been studied with regard to three morphological features. A study of the cytochrome C oxidase subunit I (COI) polymorphism was begun. Two geographically separated zones inside the Russian part of the geographic range of the species are recognized. Interpopulational differences, as judged using polymorphic traits, are very small within each zone. In contrast, the differences between the populations of the western and eastern zones reach the subspecies level of. A zone of clinal variability of morphological traits is noted in Transbaikalia. It obviously resulted from secondary contact between the western and eastern groups of populations, which were separated during the last glaciation and then rejoined.