Equilibrium-nonequilibrium states of ornithogenous geosystems in the north pacific islands |
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| Authors: | A N Ivanov |
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| Institution: | 1. Moscow M.V. Lomonosov State University, Moscow, Russia
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| Abstract: | An analysis is made of the issue related to the structural-functional organization of ornithogenous geosystems evolving in islands with large maritime colonial bird nest clusters. It is shown that under moderate ornithogenous pressure (Talan Island), the long-term vital activity of birds acts as an ecological factor identical to light, heat and atmospheric precipitation, and the geosystem is in an equilibrium state. In the case of a strong impact exceeding the stability threshold (Shelikan Island), the geosystem switches to a nonequilibrium state, which is accompanied by a degradation of the soil-vegetation cover, a mass extinction of ornithophobic plant species, a change in soilformation directedness, and by a most dramatic development of erosion processes. |
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