Since the middle of the 20th century, six species of Ponto-Caspian amphipods (Chaetogammarus ischnus, C. warpachowskyi, Chelicorophium curvispinum, Dikerogammarus haemobaphes, Obesogammarus crassus, Pontogammarus robustoides), one Baikalian amphipod Gmelinoides fasciatus and one amphipod of Atlantic origin Gammarus tigrinus have expanded in Russia and adjacent regions. A wide variety of human mediated vectors such as deliberate and accidental introductions, natural migration via constructed inland waterways and high rates of spread, survival and reproduction in these species have facilitated rapid dispersal and successful establishment of these alien species. Causes of successful establishment of these invaders and potential consequences of the invasions including extinctions of native species in rivers, lakes and estuaries of north-western Russia are discussed.

An increase of xenodiversity in plankton and benthos in the eastern Gulf of Finland was observed from 1998 to 2004. Nonindigenous species account for 4.8% of all species found and up to 96% of total biomass. Invasive benthic omnivores, the alien amphipods Gmelinoides fasciatus and Pontogammarus robustoides and the predaceous fish Perccottus glenii with their versatile diets strongly affect the community structure. Invasive sessile seston-feeders that directly (through grazing and water clearance) and indirectly (through recycling of nutrients) interact with other ecosystem components, are mainly represented by the zebra mussel Dreissena polymorpha, which affect the structure of benthic and planktonic communities as well as benthicpelagic coupling. The invasive predatory cladocerans Cercopagis pengoi and Evadne anonyx and larvae of D. polymorpha are only temporary components in the zooplankton, which is limiting their overall effect. Alien benthic bioturbators, the polychaetes Marenzelleria neglecta and the oligochaete Tubificoides pseudogaster account for a high proportion of total abundance and biomass but their effects on native species need further research.

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, 110 genera and 581 species and subspecies are reported. Species that constitute the autochthonous complex of Lake Baikal comprise 61% of the fauna (276 species, and 78 subspecies). The current taxonomic and the nomenclatural problems of amphipods from the Baikalian and Caspian groups are discussed. A separate list of alien species (or invaders) for continental waters of Russia is provided. РЕЗЮМЕ. Приведен таксономический контрольный список видов амфипод, зарегистрированных в континентальных водоемах, водотоках и подземных водах Российской Федерации (по данным на конец 2013 г.). Виды подразделены на 11 эколого-биогеографических групп: голарктические, западно-палеарктические, балтийские эстуарные, сибирско-тихоокеанского региона (восточно-палеарктические), амфипацифические, кавказские, центрально-азиатские, байкальские, эмигранты из Байкала, виды понто-каспийского происхождения, эмигранты из Северного Ледовитого океана. На дан-ный момент отмечено 26 семейств, 110 родов и 581 вид и подвид амфипод. На виды, составляющие автохтонный комплекс озера Байкал, приходится 61% состава фауны (276 видов и 78 подвидов). Даны пояснения, касающиеся современных проблем таксономии и номенклатуры байкальских и каспийских амфипод. Отдельно приведен список чужеродных видов, или видов-вселенцев в континентальные водоемы регионов России вне их первоначального ареала.

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