Zoobentoso bendrijos Baltijos jūros priekrantės zonoje (Nidos–Juodkrantės akvatorija)

Abstract

While studying regularities of the distribution of bioceonoses of the sea ground fauna, the abundance of animals and the amount of biomass, a direct connection can be noticed with the granulometric composition of bottom sediments and the depth. Coarser sediments of the bottom make optimum conditions for the development of zoobenthos. With the sediments getting finer and the depth decreasing, the biomass of some zoobenthic organisms also decreases (e. g., Macoma baltica), but the abundance of polychaetes (Pygospio elegans) notably increases. In the Nida-Juodkrantė water area where the bottom is vcovered with fine and intermediate sand, the dominant are the Pygospio elegans-Macoma baltica- Mesidotea entomon biocoenoses which are very important as a food resource for benthophagous fish, especially cod. This work offers an analysis of background data on macrozoobenthic communities at different depths of the Nida–Juodkrantė water area (the economic zone of the Republic of Lithuania)