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1
Content available remote Benthic non-indigenous species among indigenous species and their habitat preferences in Puck Bay (southern Baltic Sea)
Janas U., Kendzierska H.
Oceanologia
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2014
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No. 56 (3)
603--628
EN
To date 11 non-indigenous benthic taxa have been reported in Puck Bay (southern Baltic Sea). Five of the 34 taxa forming the soft bottom communities are regarded as non-indigenous to this area. They are Marenzelleria spp., Mya arenaria, Potamopyrgus antipodarum, Gammarus tigrinus and Amphibalanus improvisus. Non-indigenous species comprised up to 33% of the total number of identified macrofaunal taxa (mean 17%). The average proportion of aliens was 6% (max 46%) in the total abundance of macrofauna, and 10% (max 65%) in the biomass. A significant positive relationship was found between the numbers of native taxa and non-indigenous species. The number of native taxa was significantly higher on a sea bed covered with vascular plants than on an unvegetated one, but no such relationship was found for their abundance. No significant differences were found in the number and abundance of non-indigenous species between sea beds devoid of vegetation and those covered with vascular plants, Chara spp. or mats of filamentous algae. G. tigrinus preferred a sea bed with vegetation, whereas Marenzelleria spp. decidedly preferred one without vegetation.
2
Content available remote Expansion of the North American amphipod Gammarus tigrinus Sexton, 1939 to the Neva Estuary (easternmost Baltic Sea) [commun.]
Berezina N.A.
Oceanologia
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2007
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No. 49 (1)
129-135
EN
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.
3
Content available remote Gammarus tigrinus Sexton 1939 (Crustacea, Amphipoda) - a new immigrant in the Puck Bay, southern Baltic Sea
Szaniawska A., Normant M., Łapucki T.
Oceanological and Hydrobiological Studies
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2005
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Vol. 34, No.2
71--78
EN
This study deals with the occurrence and migration of Gammarus tigrinus Sexton 1939 into the Puck Bay (western part of the Gulf of Gdansk, Baltic Sea). The material was collected in September 2002 at nine stations (approximate depth – 0.4 m). The only Gammarus species found at five sampling stations was G. tigrinus. The species found at other stations located along the inner part of the Puck Bay were G. salinus, G. zaddachi, and G. duebeni. The sex ratio for G. tigrinus was close to 1. Almost 50% of the females were carrying eggs. The males were larger (6.0 š 0.8 mm) than females (4.7 š 0.8 mm). The average male dry weight was 2.5 š 1.2 mg and that of females was 2.1 š 0.7 mg. The relation between length (L) and dry weight (DW) was DW = 0.095źL1.76 (R2 = 0.76). This study indicates that G. tigrinus is spreading rapidly in the Baltic Sea.
4
Content available remote The first record of parasites in Gammarus tigrinus Sexton, 1939 - a recent newcomer to the Gulf of Gdańsk [commun.]
Rolbiecki L., Normant M.
Oceanologia
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2005
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No. 47 (2)
283-287
EN
The present paper reports for the first time on the occurrence of the parasite Maritrema subdolum in the amphipod Gammarus tigrinus, a non-native species in the Gulf of Gdańsk.
5
Content available remote The invasive amphipod Gammarus tigrinus Sexton, 1939, in Puck Bay [commun.]
Szaniawska A., Łapucki T., Normant M.
Oceanologia
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2003
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No. 45 (3)
507-510
EN
The paper is a report on the occurrence of the species Gammarus tigrinus Sexton, 1939, in the coastal waters of Puck Bay.
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