ИЗМЕНЕНИЯ БЕНТОСА В РАЙОНЕ КАЛАМИТСКОГО ЗАЛИВА ПОД ВЛИЯНИЕМ ЭВТРОФИРОВАНИЯ

Описаны состав и распределение бентоса в районе Каламитского залива Черного моря. Показано, что эвтрофирование способствует развитию зеленых водорослей и двустворчатых моллюсков. Дана характеристика изменений видового состава и структуры бентоса за 30-летний период.

Аннотация (alternative)

Benthic flora was studied in shallow zone of the Kalamitsky Bay and fauna down to 100 m depth. Comparative analysis of floristic changes which have been developing for the recent 25 years revealed the prevalence of formerly absent green algae. The major share in phytocenoses biomass in contributed by Cladophora spp. which concentrate at 2 m depth in the area subject to considerable recreation load. During the 25 years species diversity of benthic communities was increasing, the number of species has risen thrice. Coastal zone of the bay is mesotrophic, the collective portion of oligo- and mesosaprobic species amounts to 81%. The portion of polisaprobic species is 19% that is larger than in coastal waters of the Black Sea under high technogenic and recreation impact. Changes in zoobenthos of the Kalamitsky Bay are mostly similar to those registred over the Black Sea, though several special features were also detected. The transformation of communities manifested itself in the replacement of formerly dominant small polychaetes by large molluscs. This brought about an initial 2-12 times large rise of total zoobenthos biomass not found elsewhere over the sea. However the ongoing eutrophication leads to ascidian dominance and the reduction of total benthic biomass.

Библиографическое описание

Экология моря. - 1999. - Вып. 49 https://repository.marine-research.ru/handle/299011/4222

URI

https://repository.marine-research.ru/handle/299011/4222

Коллекции

Экология моря. - 1999. - Вып. 49.

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