, Volume 39, Issue 3, pp 288-301
Date: 14 May 2012

Factors determining the origin and maintenance of redundant species diversity of the soil animal population (by a case study of the Far East)

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The factors determining the origin and maintenance of a high taxonomic diversity of soil communities are discussed by a case study of the key groups constituting the soil saproblock. The bulk of the species richness in the southern Far East is localized to the coniferous-deciduous forests retaining the tertiary elements in their flora and ancient relations with the Asian tropical fauna. The roles of the following factors are considered: the long-term geographic isolation in the absence of catastrophic climate changes; pyrogenic effects, enhancing formation of isolated survival sites; and abundance of mutagenesis in various pedobiont groups. The high species richness of individual taxocenes in combination with a high topic association in the distribution of closely related and ecologically similar species suggests the absence of competitive exclusion. It has been demonstrated that this phenomenon is determined, on the one hand, by rich resource reserves and their spatial differentiation in the soil-litter stratum and, on the other, by spatial-temporal segregation and dense packing of ecological niches, decreasing competition.

Original Russian Text © G.N. Ganin, B.R. Striganova, 2012, published in Izvestiya Akademii Nauk, Seriya Biologicheskaya, 2012, No. 3, pp. 346–360.