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New data on the non-indigenous cladoceran Cercopagis pengoi (Ostroumov 1891) in the Gulf of Gdańsk (Baltic Sea) [commun.]

Bielecka L., Mudrak S.

Oceanologia

2010

No. 52 (1)

147-151

Expansion of the North American amphipod Gammarus tigrinus Sexton, 1939 to the Neva Estuary (easternmost Baltic Sea) [commun.]

Berezina N.A.

Oceanologia

2007

No. 49 (1)

129-135

The North American gammaridean amphipod, Gammarus tigrinus, was found in the easternmost part of the Baltic Sea (Neva Estuary) near a new oil terminal. This species may well have been transported to the Neva Estuary with ballast waters from the Finnish area of the Gulf of Finland, where it was recorded recently. In 2005, the mid-summer density of G. tigrinus was 27 indiv. m-2. By 2006 this species had spread 100 km to the east from the first site, colonizing the northern coastal zone of the estuary. Its density reached 99-126 indiv. m-2. Fecund females and juveniles contributed about 50% to the entire population density, which testifies to the successful reproduction and establishment of G. tigrinus in the Neva Estuary. There is a high risk of further expansions of G. tigrinus from the new area to the various lakes of Eastern Europe via inland canal-river systems, which may lead to unforeseeable changes in aquatic communities.

A new occurrence of the benthic amphipod Dyopedos monacanthus (Metzger, 1875) in the southern Baltic Sea - the first record in the Słupsk Furrow [commun.]

Dziaduch D.

Oceanologia

2007

No. 49 (3)

439-445

The paper reports on the occurrence of the epibenthic amphipod Dyopedos monacanthus (Metzger, 1875) in the Baltic Sea. This species belongs to the family Dulichiidae and is found in the North Atlantic and European coastal waters from northern Norway to the English Channel and the Danish Straits. Some 50 years ago, only a few individuals of D. monacanthus were occasionally sighted in the western Baltic (the Arkona and Bornholm Basins). In summer 2006, unusual amphipod specimens were noticed at five deep-water stations over the Slupsk Furrow. This was the first time that D. monacanthus was observed in that area, which is currently the easternmost limit of the species' range in the Baltic Sea.