Main Trends in the Latitudinal Distribution of Orthoptera in Hissar-Darvaz (Tajikistan): Communication 1

摘要

The distribution of 127 orthopteran species in Hissar-Darvaz (Tajikistan) is analyzed on the basis of the quantitative data on their vertical distribution at latitudes from 300 to 3000 m above sea level. Lowland and highland species and species distributed in all latitudinal levels were distinguished. The latitudinal distribution of species is analyzed and factors limiting their distribution are discussed. The question on the border between mountain and lowland species is widely discussed in the biogeogra-phical literature and remains debatable (Kryzhanov-skij, 1965; Chernov, 1984; Sergeev, 1988). Quantitative estimations are absent in many studies; therefore, latitudinal borders of the distribution of species remain unclear. Meantime, such investigations significantly enlarge our knowledge on the reserve adaptation of species and are obligatory in mountain regions with their three-dimensional structure of the environment (Prokaev, 1967; Gorodkov, 1985).