Cytogenetic analysis of the species composition and inversion structure of populations of malarial mosquitoes in the Astrakhan region

A cytogenetic analysis of Anopheles mosquitoes in the Astrakhan region was carried out. Three species of Anopheles were identified. An. messeae lives everywhere and prevails in all of the areas of research, An. hyrcanus is found in the southwest of the region, and An. maculipennis in the northern part of the region. The populations of An. messeae show a high level of inversion polymorphism for the sex chromosome and the third autosome. A clear clinal trend of an increase in chromosomal rearrangements XL₁, 3R₁, and 3L₁ and a decrease in the frequency of evolutionary source alternatives was revealed in laraval hemipopulations of the species from south to north.