Macrozoobenthos communities of littoral part of the Azov sea Taman bay
Monitoring providing and detailed study of macrozoobenthos in Taman bay littoral zone is connected not only with constant changes inside the benthic communities in the region, where ecological minimum are combined for Azov sea and Black sea eurybionts, but also with a person massive activity, in the result of which alteration of bottom silt types takes place in the researched side of Azov sea. The aim of the given work is the irreversible alterations research in the benthic communities of Taman bay littoral zone under the influence of antropogenic factors. Probes, selected in Taman bay in the course of coast expedition in July 2013 served as the material. Total amount of probes comprised 54 quantitative probes of macrozoobenthos by Petersen bottom-grab with a gripping area of 0,034 m2 in 3-rd replications at 18 stations at the depth to 1,5m. Gathering and processing of probes was conducted according to standard hydrobiological methods. Macrozoobenthos types were identified with the help of popular determinants. Medium values of numerical strength and biomass at the station are given in the work. Communities are separated according to biomass. The medium values of numerical strength and biomass of macrozoobenthos in the littoral part of Taman bay comprised 7237 exem/m2 and 86 g/m2 accordingly. Total numerical strength and biomass altered from 160 exem/m2 to 23670 exem/m2 and from 0,4g/m2 to 402 g/m2 accordingly. Minimum biomass values are marked at the solid sandy ground and shelly material (Taman bay open part) and marshy sludgy bottom (salt lagoon at the spit Tuzla). High biomasses were connected with wide development of big mussels of Cerastoderma glaucum (Poiret, 1789), Anadara kagoshimensis (Tokunaga, 1906) and Abra segmenta (Récluz, 1843). Seven biocenosis are separated in the littoral part of Taman bay, the most part of which is taken by two (at slimy grounds) communities with dominance of C. glaucum and A. segmenta. Community of Cerastoderma glaucum was met at the sludgy and also sandy grounds with dominant biomass from 32 to 113 g/m2 and from 1 to 34 g/m2 accordingly. Community of Abra segmenta was widespread in salt lagoons at Tuzla and Rubanov spits, and in the apex part of Dinskoy Bay with dominant biomass from 3 to 126 g/m2. Community of Mytilus galloprovincialis (Lamarck, 1819) is marked at the sandy ground with presence of shelly material (1 g/m2) and at the solid clay with shelly material (138 g/m2). Community of Anadara kagoshimensis was met at the one station (at the sandy ground without plant formation) with numerical strength and dominant biomass of 10 exem/m2 and 122 g/m2 accordingly. Community of Hydrobia acuta A.Costa, 1853 was marked at the slightly silty sandy ground with numerical strength and dominant biomass of 1333 exem/m2 and 1,5 g/m2 accordingly. Community of Ampelisca diadema A.Costa, 1853 was met at the solid sandy ground, covered with thickets Zostera noltii Hornem with numerical strength and biomass of 11220 exem/m2 and 11 g/m2 accordingly. Community of Idothea baltica basteri Audoin, 1827 was met at the slimy ground with water plants and dirty sand with shell material without vegetation with numerical strength and dominant biomass from 660 to 1059 exem/m2 and 14 g/m2 accordingly. In 2013 one marked 90 macrozoobenthos taxons related to 10 types. The most mass groups: Mollusca (Bivalvia, Gastropoda), Annelida (Polychaeta) and Arthropoda (Crustacea).Various macrozoobenthos communities distribution in Taman bay littoral zone at the depth to 1,5m. is connected with mosaic distribution of sandy-shell and sludgy benthal depositions of various grain-size classification composition in the researched area. Siltenduring biocenosis increase is marked (Cerastoderma and Abra) that is considered to be the consequence of Taman bay siltage.