ИЗМЕНЕНИЯ ВИДОВОГО СОСТАВА, ЭКОЛОГИЧЕСКИХ И МОРФОЛОГИЧЕСКИХ ХАРАКТЕРИСТИК ПОЛИХЕТ СЕВЕРО-ЗАПАДНОЙ ЧАСТИ ЧЕРНОГО МОРЯ ЗА ПОЛУВЕКОВОЙ ПЕРИОД

Changes in species composition, density and distribution of some abundant species of Polychaeta from the northwestern Black Sea are considered. Data on the taxonomic and ecological diversity of Polychaeta in this region of sea are presented. Appearance and distribution of Nereis succinea specimens without V group of paragnats in the Danube-Dnieper interfluve region are mentioned.