StatusThe thesis was presented on the 30 April, 2009
Approved by NCAA on the 18 June, 2009
Abstract– 0.27 Mb / in russian
– 0.26 Mb / in romanian
1.77 Mb /
Development of theoretical notions on the local fauna forming, patterns and trends in faunal parameters against disturbances and regular factors is the main goal of this work, aiming at progress in methods of biodiversity assessment.
Zoological regularities manifest in limits of succession of guilds, substituting one other in frames of the ecosystem succession. Plant diversity determines level, but not pattern of faunal diversity. Plant diversity creates the opposite vectors of influences on animals therefore description of plant diversity reflects the community diversity not always. Practical limitations exclude some known diversity models while parameters of the Zipf-Mandelbrot model do not make a dynamics with ecological sense. Contrary to the primary interpr etation of the geometric series model (GS), namely competitive ability forms the order of ranks in domination of species. Basing on the GS three distributions of species abundances – typical GS deflections are determined; those correspond to the guild stat e; however the direct relation of distribution type with succession stage is impossible for mobile animals. The guild structuring that is not directly determined by a level of resource consumption allows the proposing of idea of informational competition. That resolves problem of discrepancy between distributions of population density and of resource sharing, and Lawton-Strong’s paradox: ecological laws based on competition principle are adhered to insects in spite of evident competition is rare dew to many dimensions in niche division. Dynamics of species numbers does not destabilize dynamics of diversity out of extreme cases.
It is shown that dependence of occurrence of a taxon on the width of its trophic spectrum cannot be proved statistically true though habitat degradation reflects on specialized species first of all. Intra - and inter-specific aggregation encourages species richness of an aphid association and population stability that is probable for many other taxa. Interaction between biotopes contrib utes to the forming species richness and diversity, this contribution is wider than foreseen by Island Theory.
Succession stage in a biotope -recipient influences upon the level of interaction
between biotopes. Advantages of the relative measures of diversi ty (RSD) for
monitoring and community assessment are shown , and untrue RSD applications are
identified. An integral index is suggested that makes easier interpretation RSDs.
Comparison of the prognostic and revealed species richness makes an option for
faunal loss appraisal when retrospective data are absent.