variation in the species Montivagum
dihumerale and speciation in
chigger mites (Acari: Trombiculidae)
26-46 (2006) (In Russian, English summary).
S U M M A R Y
Intraspecific morphological variation of the
chigger mite species Montivagum dihumerale (Traub
et Nadchatram, 1967) is studied. Eco-geographic rules of the variation
are revealed. General size of mites is found to be increased along with
the rise of the high-mountain character of the landscape in the
collection localities. The numbers of idiosomal setae are varied
independently from the size parameters and geographically close
populations are proved to be the most similar by these characters. At
the same time, numbers of the setae of different types play the leading
role in the discrimination of closely related Montivagum
species, while the eco-geographical rules have not been found in this
genus at the level of interspecific differences. As a result, the
hypothesis is set up, that a significant degree of isolation of local
populations separated from each other by high mountain ranges of the
Central Asia is the main factor of speciation in the genus Montivagum.
Regional character of this speciation mode is confirmed by the
comparison with other chigger mites taxa.