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Size structure and body condition of Ponto-Caspian gammarids in the Vistula estuary (Poland)

Dobrzycka-Krahel Aldona, Tarała Anna, Majkowski Wojciech

Oceanological and Hydrobiological Studies

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2019

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Vol. 48, No. 1

23--30

EN

Over the past few decades, Ponto-Caspian gammarids Pontogammarus robustoides, Obesogammarus crassus and Dikerogammarus haemobaphes have colonized the European inland and coastal brackish waters. Previous experimental studies of P. robustoides, O. crassus and D. haemobaphes indicated that the salinity optimum for the species is about 7 PSU. We examined whether salinities below 5 PSU in the Vistula estuary – the Vistula Lagoon and the Vistula Delta, create a favorable environment and have a positive effect on Ponto-Caspian gammarids. The objective of this work was to determine the population parameters (size structure) and biological indicators (condition) of the studied gammarid species at a low salinity level. Length–weight relationships can be considered as their body condition in the environment. These relationships were calculated for each gammarid species according to the exponential equation y = axb, where: y – wet weight, x – total length, a – intercept, b – slope. The results clearly show responses of Ponto-Caspian gammarids to the low salinity habitat and indicate that such environment provides excellent conditions. The results of analysis show that the condition of gammarids is good. The optimal strategy of the examined alien gammarids may help them to maintain a strong competitive position in the environment and affect the colonization process in non-native waters with low salinity.

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Ponto-Caspian gammarids – new species in the Gulf of Gdańsk (Southern Baltic Sea)

Dobrzycka-Krahel A., Kendzierska H., Szaniawska A.

Journal of Ecology and Health

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2013

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R. 17, nr 3

110--114

EN

Non-indigenous gammarid species: Pontogammarus robustoides (G.O.Sars, 1894), Obesogammarus crassus (G.O. Sars, 1894), Dikerogammarus haemobaphes (Eichwald, 1841) and Dikerogammarus villosus (Sowinsky, 1894) are present in the Gulf of Gdańsk (southern Baltic Sea). These species reached the Gulf of Gdańsk by 2010 near the point where the River Vistula flows into the Baltic Sea, and become constituents of the amphipods in shallow bottom. All the gammarid species found are of Ponto-Caspian origin. They have been able to move across Europe along rivers and canals, and inhabit reservoirs and drainage systems in the vicinity of such waterways. D. villosus is the latest gammarid species to have colonized Poland. The floods that afflicted Poland in May and June 2010 could have had a significant influence, intensifying as they did the inflow of water from the Vistula into the Gulf of Gdańsk. This could have accelerated the arrival of individuals of these species. The water salinity at the sampling stations was 5.8 – 6.1 PSU. The possible invasion of non-native gammarids may have important consequences for the benthic fauna communities in the Gulf of Gdańsk.

PL

Nierodzime gatunki kiełży: Pontogammarus robustoides (G.O.Sars, 1894), Obesogammarus crassus (G.O. Sars, 1894), Dikerogammarus haemobaphes (Eichwald, 1841) and Dikerogammarus villosus (Sowinsky, 1894) obecne są już w Zatoce Gdańskiej (Bałtyk Południowy). Gatunki te pojawiły się w Zatoce Gdańskiej w 2010 roku, niedaleko ujścia Wisły do Bałtyku i stały się składnikiem obunogów płytkiego dna. Wszystkie wymienione gatunki są pochodzenia ponto-kaspisjkiego. Przedostały się do Europy rzekami i kanałami, i zasiedlają zlewnie tych rzek. D. villosus jest najnowszym przybyszem, który skolonizował Polskę. Najprawdopodobniej powódź, która dotknęła Polskę w maju i czerwcu 2010 roku zintensyfikowała napływ wód Wisły do Zatoki Gdańskiej. Przyśpieszyło to przedostanie się osobników wymienionych gatunków do Zatoki Gdańskiej. Zasolenie wody na stacjach zbioru materiału wynosiło od 5.8 do 6.1 PSU. Inwazja nierodzimych gatunków kiełży może znacznie wpłynąć na zespoły bentosowe Zatoki Gdańskiej.

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First records of Ponto-Caspian gammarids in the Gulf of Gdańsk (southern Baltic Sea) [commun.]

Dobrzycka-Krahel A., Rzemykowska H.

Oceanologia

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2010

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No. 52 (4)

727-735

EN

The paper reports the first records of non-indigenous Ponto-Caspian gammarid species: Pontogammarus robustoides (G. O. Sars, 1894), Obesogammarus crassus (G. O. Sars, 1894), Dikerogammarus haemobaphes (Eichwald, 1841) and the latest colonizer - Dikerogammarus villosus (Sowinsky, 1894) - in the Gulf of Gdańsk (southern Baltic Sea).