Abstract
Changes in the vegetation on Ostrovnoy peninsula, with its large rookery of sea birds, are described. The number of birds has increased substantially since the early 1990’s. The most striking effect caused by the birds occurred in the middle of the 2000’s, which resulted in the disappearance of about ten species of flora, while a dry grass meadow was replaced by an ornithogenic reedgrass-wormwood meadow. At present the effects of the birds is somewhat weakened, and changes in the composition of vegetation have slowed down; partial recovery of the grass covering on previously distorted regions is being observed. The equilibrium of the “island” ecosystem is disturbed. Further processes that will take place in the vegetation cover are as yet unpredictable and depend first of all on the dynamics of the bird population.
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