| Abstrakt: |
During recovery succession, structural and functional changes in oribatid mite communities occur: the number of species increases, the structure becomes more complex, the proportion of surface-living and nonspecialized forms increases, and the role of parthenogenetic species decreases. The direction of succession is to form a community characteristic of the zonal type of vegetation. Four stages are selected. The colonization--accumulation stage involves the initial accumulation of organic matter due to activity of microorganisms. Oribatids are not numerous at this stage. The unstructured stage is characterized by unstable monodominant communities of parthenogenetic oribatids with short life cycles. The next stage is structuring, when the proportion of parthenogenetic forms decreases, and that of nonspecialized forms increases. Communities are monodominant. The final stage is stabilization. The proportion of parthenogenetic species decreases noticeably. The generic and species composition of the communities stabilizes. The community achieves zonal features. Successions of oribatid mites on disturbed areas were studied on Kamchatka and the Kuril Islands on soils exposed to ash fallout and at different stages of soil formation. Other areas exposed to volcanic activity were also studied. Moreover, the rock dumps of open pits of different ages in the surroundings of Khabarovsk were also surveyed. |
