Аннотация:The humidity preference was estimated in 70 collembolan species on the basis of their abundance
in different habitats in the forest belt of eastern Europe. Groups of mesophilous, hygrophilous, and xerophilous species were distinguished. An association between the hygropreferenda of collembolans and their belonging to life forms was revealed. The dynamics of variation of the hygropreferenda was traced. Changes in the biotopic preferences of collembolans in the forest belt of eastern Europe conform to the rule of zonal succession of biotopes.