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Dynamics of the Baltic clam Macoma balthica (Mollusca: Bivalvia) infection with digeneans from the Gymnophallidae family in the Gulf of Gdańsk

Zgud I., Rolbiecki L., Wołowicz M.

Oceanological and Hydrobiological Studies

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2012

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Vol. 41, No. 4

47-52

EN

Macoma balthica is a marine bivalve commonly occurring in the boreal zone. It is one of the most common zoobenthos species in the Baltic Sea, including the Gulf of Gdańsk, and a significant element of the food web. Observations of the infection prevalence in M. balthica from different parts of Gulf of Gdańsk were conducted in 2007-2008, taking into account the water depth. Metacercariae of Gymnophalloides (=Lacunovermis) macomae (prevalence: 89.0%) were found, as well as sporocysts with metacercariae of Parvatrema affinis (prevalence: 1.1%) and unidentified sporocysts with cercariae (prevalence: 1.3%). The most infected clams were found on the shallowest research station (30 m).

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Differences in reproduction and condition of Macoma balthica and Mytilus trossulus in the Gulf of Gdańsk (Southern Baltic Sea) under anthropogenic influences

Pierścieniak K., Grzymała J., Wołowicz M.

Oceanological and Hydrobiological Studies

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2010

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Vol. 39, No.4

17-32

EN

Seasonal changes in gametogenesis, spawning behaviour and morphometric parameters of Macoma balthica and Mytilus trossulus from two depth zones in the Gulf of Gdańsk (Southern Baltic Sea) were investigated. The studies allowed the authors to make observations of the ecophysiological features of both species and revealed major differences in the weight index between deep and shallow water subpopulations. Both condition and gametogenesis probably depend mainly on the availability of nutrients and on temperature changes. The data showed that Mytilus trossulus spawned earlier at the shallow water station than at the deeper one. No differences were observed between the run of the Baltic clam’s reproductive cycle at 10 m and at 75 m depths.

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Seasonal and annual changes in the macrozoobenthic populations of the Gulf of Gdańsk with respect to hypoxia and hydrogen sulphide

Janas U., Wocial J., Szaniawska A.

Oceanologia

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2004

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No. 46 (1)

85-102

EN

This study was designed to investigate seasonal and annual changes in the benthic macrofauna in relation to changes in hydrogen sulphide concentration in the sediment and the oxygen content in the water column. Data were collected over a three-year period from 1994 to 1997. The benthic macrofauna inhabiting the sediments of the Gulf of Gdansk, in which H2S is permanently present, consists mostly of species with a high tolerance to oxygen deficiency and the presence of H2S. These species are: Macoma balthica, Harmothoe sarsi, Nereis diversicolor, Saduria entomon and Halicryptus spinulosus, as well as Pontoporeia femorata and Corophium volutator, which are more sensitive to these factors. In 1996-1997 a decline in the abundance of almost all benthic species, and especially of the bivalve M. balthica at all the stations was observed in comparison to 1994-1995.