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1

Recrutation and settlement of young flounder (Platichthys flesus) in the western part of the Gulf of Gdansk (Baltic)

100%

Sapota M. R., Kaminska U.

Oceanological Studies

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1998

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vol. 27

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issue 3

31-42

EN

On a basis of whole year monthly sampling, the abundance of the flounder in inshore shallow waters of the western part of the Gulf of Gdansk was established. Flounders were observed almost all year. Only in winter, when sea ice forming proc-esses occurred, they disappeared from the investigated zone. The highest abundance of the flounder was noticed in Hel vicinity. No flounders were observed in inshore waters of the Puck Lagoon. Young flounders occurred in the highest number in July (average for all investigated area amounted to 2.81 individuals 100/ m^2). In that month, this-year-born flounders settle in the inshore shallow water zone. The highest biomass was noticed in August (average 4.98 g/100 m^2) when older bigger flounders more frequently inhabited inshore zone. Body proportions of young flounders during their growth in inshore shallow waters of the Gulf of Gdansk are stable. All measured distances were increasing linearly with the growth of flounder length.

2

Density, biomass, and distribution of benthic invertebrates in the mid-lake zone of the coastal Lake Gardno

88%

Dobrowolski Z.

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EN

The mean density (4.2 ? 103 ind. m-2) and mean biomass (10.8 g wet weight m-2) of the mid-lake zoobenthos in the mixo-oligohaline Lake Gardno were consistent with the respective ranges typical of freshwater, polymictic, and strongly poly-trophic lakes of northern Poland. The major components of the Lake Gardno macrozoobenthos were tubificid oligochaetes and chironomid larvae, the latter dominating in terms of abundance and biomass. Neomysis integer (Leach) was the sole and numerically scant marine invertebrate in the Gardno mid-lake macro-zoobenthos. Biodiversity, taxonomic composition, dominance structure as well as densities and biomass of the macrozoobenthos studied showed considerable spatial variation. The lake-river contact zone exhibited the presence of the ecotone effect. Dynamics of the abundance and biomass of the benthic invertebrates inhabiting that zone were markedly different from those found in other mid-lake habitats of the Gardno.

3

Spatial distribution of chlorococcalean genera in the phytoseston of the we?na and nielba rivers

88%

Messyasz B.

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issue 2

33-44

EN

The chlorococcalean flora from two crossed rivers during the summer period (from July to September 2001 and 2002) was examined. Phytoseston communities were collected from the We?na and Nielba rivers before and behind the cross-rivers as well as from the central place of the cross-rivers. Species belonging to 6 dominant genera: Scenedesmus, Pediastrum, Monoraphidium, Ankistrodesmus, Coelastrum and Tetraedron were found in both rivers. At most of the stations located along the We?na and Nielba rivers after their crossing a trend of increasing green algae species richness together with an increase in the total species number of cells was observed. Furthermore, it was found that the We?na river takes over some of the Nielba phytoseston species.

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2 Oceanological Studies

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1 Dobrowolski Z.

1 Kaminska U.

1 Messyasz B.

1 Sapota M. R.

Recrutation and settlement of young flounder (Platichthys flesus) in the western part of the Gulf of Gdansk (Baltic)

Density, biomass, and distribution of benthic invertebrates in the mid-lake zone of the coastal Lake Gardno

Spatial distribution of chlorococcalean genera in the phytoseston of the we?na and nielba rivers