| Abstract: | The role of chromosomal variability was studied in the process of biotopical distribution of larvae of the sibling species Anopheles messeae and A. beklemishevi. It is shown that frequency of the inversions XL1, XL2, 2R1, 3R1 of A. messeae was changed in the lakes with different larval quantity of the sibling species. Mosquito of A. beklemishevi were developed in the suboptimal biotops having low larwal quantity of A. messeae with the analogous chromosomal arrangement 2R1. The larvae with "northeast" genocomplexes of A. messeae prevailed over A. beklemishevi in the lakes with high larval quantity and this prevalence determined dominant state of A. messeae. It is noted that natural selection on the preimaginal stages of development acts in the direction of karyotypic divergence of the sibling species and promotes more effective utilisation of food resources by each species. |
