Influence Of Lake Inflow On The Benthic Communities Of Varna Bay

As a result of high urbanization and industrialization the Varna Bay is one of the most influenced by anthropogenic activity region of the Bulgarian Black Sea area. Simultaneously the Varna Lake nutrient-enriched inflow contributes additionally to the negative changes of the ecological situation, especially in summer. To establish the state of the benthic communities in contact with lake waters in 2019, samples of macrozoobenthos were collected. The quantitative parameters of macrozoobenthos in Varna Bay established: taxonomic structure dominated by Polychaeta, spring abundance 2.5 twice higher that in autumn, built mainly by Oligochaeta, known as indicators for eutrofication. During both seasons the biomass maintains low values, due to predominance of small-sized mollusks. According to statistical indices the ecosystem status is slightly or moderately disturbed, with better results for the North region. Cluster analysis clearly defines 2 groups, according to the bottom substrata, with stations along the way of lake inflow waters forming an independent cluster. In conclusion, despite the total state of the Varna Bay ecosystem, the most negatively influenced stations are along the lake inflow way

CHANGES IN THE SYSTEM HISTIDINE DECARBOXYLASE-HISTAMINE HISTAMINASE IN NEWBORN THYMECTOMIZED RATS

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Dynamics of macrozoobenthos in the Southern Bulgarian Black Sea coastal and open-sea areas

The paper presents results of analysis of 96 macrozoobenthic samples, collected on a seasonal basis in Bourgas Bay and in open-sea areas offshore Cape Emine (Bulgarian Black Sea) in 1996 and 1998. In total 96 taxa were established, distributed in four groups: Polychaeta, Mollusca, Crustacea and “Diversa”. The average density of populations was 1756 ind.m-2 with a predominating abundance of Polychaeta species. The average biomass estimated was 183.02 g.m-2, formed mainly by representatives of Mollusca. The latter species were measured together with the shells, which appraised their individual weights. Seven of the species found had a coefficient of constancy more than 50%. These were the most adapted species to the environmental conditions of the investigated areas. The quantitative and qualitative assessments in this study demonstrate an increasing tendency in the parameters obtained (density, biomass, species diversity) in comparison with previous investigations in the early 1990-s, when intensive anthropogenic influence was widely perceived to misbalance the Black Sea ecosystem.The method of Warwick (1986) applied to characterize the water quality of the studied areas allowed us to define them as rather clean or moderately polluted aquatories

ADENYLATE CYCLASE AND PHOSPHODIESTERASE ACTIVITIES DURING ANAPHYLACTIC SHOCK IN GUINEA PIGS

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ELECTROCARDIOGRAPHIC CHANGES IN EXPERIMENTAL MYOCARDITIS AND ARTHRITIS IN NEONATALLY THYMECTOMIZED RATS

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