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1

Growth of the young flounder (Platichthys flesus) in inshore shallow waters of the Gulf of Gdansk

100%
Sapota M. R., Mudrak S.
Oceanological Studies
|
1998
|
vol. 27
|
issue 3
19-29
EN
The age and rate of growth of the flounder from inshore shallow waters of the Gulf of Gdansk (from shore to 1-m depth) have been investigated. Mainly the flounder from 0 and 1-year age group exists in this zone. Flounders from 0-year age group enter shallow waters of the Gulf of Gdansk in June or July. They stay in this area till the end of the year. Flounders from 1-year age group are represented in the investigated zone all year. Bigger individuals from this group migrate into deeper waters.
2

Predictional model of biocenotic changes in offshore Baltic plankton due to temperature increase

71%
Plinski M., Zmijewska M. I., Sapota M., Witek B., Mudrak S.
Oceanological and Hydrobiological Studies
|
2003
|
issue 3
29-41
EN
Over the last 20 years, more and more reliable data concerning global climate change, mainly climate warming, have become available in the literature. Change such as this has also been documented in the Gulf of Gdansk. Climate change has an influence on aquatic ecosystems and especially their biocoenoses, and plankton is one of its most sensitive ecological fractions. Positive and negative statistical correlation in the exclusive relationship between the quantity of plankton groups and water temperature has been observed. When time was applied as a factor, only the annual increments of the blue-green algae correlation were statistically significant, and the regression equation calculated in this paper was applied to predict a rise in the population number of this algae in response to increasing temperature. It was not possible to perform this calculation with the other plankton components.
3

The seasonal and short-term variability of zooplankton taxonomic composition in the shallow coastal area of the Gulf of Gdansk

61%
Bielecka L., Gaj G. M., Gaj M., Mudrak M. S., Mudrak S., Zmijewska Z. M. I., Zmijewska M. I.
Oceanological Studies
|
2000
|
vol. 29
|
issue 1
57-76
EN
Seasonal and short-term variability of zooplankton taxonomic composition in the shallow coastal area of the Gulf of Gdansk was reconstructed from analyses of material collected at weekly intervals between March 1998 and March 1999, using a Kopenhagen net with a 50 ?m-mesh size. Water temperature was also measured during the investigations, which enabled precise monitoring of the seasonality in the area. The contribution of a particular species and its density varied seasonally and, in the majority of cases, even weekly. On the one hand, the diversity and instability of particular zooplankton components were observed; on the other hand, though, the long-term presence and domination of species commonly inhabiting the waters of the Gulf of Gdansk (Acartia spp.) were confirmed to be independent of environmental conditions, especially, temperature. Frequent plankton catches resulted in identification of periods of fast qualitative changes within zooplankton and precise definition of the time when a particular taxon occurs. The time of dominance in major taxonomic zooplankton groups lasted: Tintinnina - 17 weeks, Rotatoria - 9 weeks, Copepoda - 2 weeks. Cladocera never was a dominant taxon.
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