Berezina* and Alexey A. Maximov Zoological Institute of the RAS 1 Universitetskaya Emb., Saint-Petersburg, 199034, Russia Received 20.06.2016, received in revised form 14.07.2016, accepted 09.10.2016 This paper focuses on the group of the estuarine Baltic amphipods describing abundance and biomass of their representatives in the shallow- and deep water communities of the eastern part of the Gulf of Finland and assessing their food habits. <...> Actuality of this study is determined by an increase in the number of species and abundance of amphipods in the ecosystem of the Gulf of Finland in recent years, mainly due to invasion of new species. <...> Altogether 10 species of amphipods were recorded at 43 sites in 2013-2015. <...> Invasive species of amphipods were dominated by biomass (40 % of the total benthic biomass) and occupied an important position in the coastal food chain of the gulf. <...> The most abundant species such as Pontogammarus robustoides, Gmelinoides fasciatus and Gammarus tigrinus attributed to be omnivorous or carnivorous animals, changing their diet during ontogenesis. <...> Adult males of these species preyed actively upon coexisting species of invertebrates reducing their abundance. <...> All rights reserved * Corresponding author E-mail address: na-berezina@rambler.ru # 409 # Nadezhda A. <...> Abundance and Food Preferences of Amphipods (Crustacea: Amphipoda)… <...> Количественные характеристики и пищевые предпочтения бокоплавов (Crustacea: Amphipoda) в восточной части Финского залива Балтийского моря Н.А. Березина, А.А. Максимов Зоологический институт РАН Россия, 199034, Санкт-Петербург, Университетская наб., 1 В данной статье рассмотрены амфиподы из группы эстуарных балтийских видов, в том числе их представленность в прибрежных и глубоководных сообществах восточной части Финского залива, и оценено их значение в трофических <...>