• Shoal-water macrozoobenthos of the south-eastern part of the Karkinit Bay (Black Sea)

      Kopiy, V.G.; Bondarenko, L.V. (2021)
      This work is based on the data collected during the benthic survey of soft sediments along the coastal zone of the south-eastern part of the Karkinit Bay in August, 2018. The current condition of the macrozoobenthos relating to the changes occurring in the bay area after the termination of the North- Crimean Canal’s operation has been analyzed. The samples were collected using a manual box-corer with a capture area of 0.04 m2 at the depths from 0 to 1 m. The depth of the captured surface soil layer was 5–7 cm. The following indices have been used to describe the quantitative development of the benthos: abundance, biomass, occurrence, density index, and the Chekanovsky–Sørensen similarity coefficient. In total, 15 species of polychaetes, 19 species of crustaceans, 5 species of Mollusca and unidentified species of Oligochaeta, Chironomidae, Nemertea, Turbellaria and Actiniaria have been found. The average values of macrozoobenthos abund ance and bioma ss in the investigated area were 3,131±2,031 ind./m2 and 24.66±16.93 g/m2, respectively. The largest number of species has been recorded within the water area of “Swan Islands” natural reserve. The trophic structure of the macrozoobenthos is represented by poly-, phyto-, detrito- and carnivorous animals. A high similarity level of faunas has been registered between the mouth and the inner part of the Krasnoperekopsk Bay. Following the analysis of the macrozoobenthos status in 2008 and 2018, changes in prevalence of certain taxonomic groups and abundant species of the macrozoobenthos have been identified.