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The distribution of water vegetation on the Polish coast of the Baltic Sea in 1996-2000

100%

Plinski M., Jozwiak T.

2004

issue 2

28-40

Qualitative analysis of vegetation along the Polish coast was conducted. Thirty-six species were noted - 16 of green, 5 of brown and 7 of red algae and 8 of vascular plants. In the 1996-2000 period, the share of green algae was always more than 50% of the floral composition. Only a few species were present throughout the period of investigations, as follows: green algae - Enteromorpha ahlneriana, E. intestinalis, Cladophora albida, Cl. glomerata, Cl. rupestris, Cl. sericea, Cl. vagabunda; brown algae - Pilayella litoralis, Fucus vesiculosus; red algae - Polysiphonia violacea, Ceramium diaphanum; vascular plants - Zostera marina. Some general conclusions can be drawn with reference to the geographical distribution of the species. Enteromorpha intestinalis was the only species that occurred at every station in almost every year. Three species of the genus Cladophora (Cladophora albida, Cl. rupestris, Cl. sericea) and Pilayella litoralis were also very common. Zostera marina was nearly absent from the central part of the Polish coast. Other species occurred rarely and accidentally.

Vegetation along the Polish Coast of the southern Baltic in 1992-95

81%

Plinski M., Kwiatkowska B., Jozwiak T.

Oceanological Studies

1996

vol. 25

issue 4

81-95

The vegetation along the Polish coast was subjected to qualitative analysis. 38 plant taxa were identified: 24 Chlorophyta, 3 Pheophyta, 9 Rhodophyta and 5 Spermatophyta. The seasonal variation in the occurrence of macrophytobenthos in the Gulf of Gdansk was studied. Green algae were most abundant in the summer (May-September), red algae in the autumn (August-November). A significant expansion of Ectocarpaceae species was found to have oc-curred. Ectocarpus siliculosus and Pilayella litoralis, especially the later, are species which have expanded along the whole Polish coast. Enteromorpha species, mainly E. compressa and E. intestinalis, and also Cladophora species, especially C. albida, C. sericea and C. vaga-bunda were common. The changes observed in the vegetation during the last few years show that the increase in trophy is significant because the species diversity has shifted to the domi-nance of one or a few species occurring at very high densities

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1 Oceanological Studies

1 Oceanological and Hydrobiological Studies

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1 1996

2 Jozwiak T.

2 Plinski M.

1 Kwiatkowska B.

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The distribution of water vegetation on the Polish coast of the Baltic Sea in 1996-2000

Vegetation along the Polish Coast of the southern Baltic in 1992-95