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Role of macro- and meiobenthos in the bottom communities of the inner Gulf of Finland

The role of macro- and meiobenthos in the bottom communities of the inner Gulf of Finland was studied under different environmental conditions. In the shallow areas above 20 m isobath so-called principle of biocoenotic compensation was observed, that is, increase of meiobenthos quantitative characteristics with macrobenthos impoverishment. This principle was violated in the deeper areas, where bottom communities were wiped out periodically because of hypoxicanoxic events. The deep-water communities characterized by very unstable structure. The both studied benthos components were adversely af fected by hypoxia. In the following recovery succession macrobenthic polychaetes Marenzelleria spp. got advantage, which able to colonized quickly vacant bottoms because of presence of plankton larvae. The meiobenthos was typified by slower recovery. Thus, in the open waters of the Gulf of Finland meiobenthos can not compensate disappearance or strong impoverishment of macrozoobenthos in the case of near-bottom hypoxia formation, which in the last years became a common phenomenon for the most part of area of this water body.