Demography of dispersion in mole rat Spalax microphthalmus (Rodentia, Spalacidae)

摘要

Results of analyzing demographic structure in the settling part of Spalax microphthalmus population are given. In the sample of settled individtuals a drastic predominance of females in the first age cohort (0.83) was observed, but in elder cohorts males prevailed. Sex ratio varied from 0.2: 1.0 in the first cohort up to 1.69-2.0 : 1.0 in higher ones. The first cohort significantly differed in female proportion from the second (t= 3.28, p <1) and elder (t = 3.39, < 0.01) cohorts, The sexual structure of the group containing settling inaiviauals differed significantly (X~2= 3.39, p < 0.01) from that of the middle-aged population. The rate of settling different-aged females was proportional to that in their population, for males significant differences were determined (X~2 = 21.68, p = = 0.0029). Differences between age distributions in the population and in the sample of settled animals were observed in males of the 1st and 2nd age cohorts, in females-from the 1st one. Males are mainly sealed in the second year of life, females-in the first one. Distances of settling range within several tens and hundreds of meters.