A biotopic subdivision was observed for the two closely related species Anopheles messeae and A. beklemishevi in larval biotopes of the Tomsk oblast. The regularities of the spatial distribution of A. messeae with various chromosomal inversions were determined. The A. messeae karyotypic structure proved to vary depending on the ecological conditions of wintering and reproduction sites. The frequencies of chromosome variants XL0, 2R0, 3R0, and 3L0 were maximal in villages, while forest biotopes were characterized by elevated frequencies of alternative inversions. A comparison of the chromosomal structure for larvae and adults confirmed the subdivision of spatial niches for adults with different karyotypes. The difference in spatial niches was assumed to reflect the ecological specialization of mosquitoes. At the interspecific level, such specialization allows closely related species to occur in sympatry regions. At the intraspecific level, a subdivision of spatial niches reduces the intraspecific competition, increases the population size, and improves the survival during unfavorable periods associated with changes in abiotic factors.
Russian Journal of Genetics – Springer Journals
Published: Apr 25, 2009
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