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

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Plinski M., Zmijewska M. I., Sapota M., Witek B., Mudrak S.

Oceanological and Hydrobiological Studies

2003

issue 3

29-41

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.

Horizontal distribution of phytoplankton and zooplankton from the littoral towards open waters under wind stress

75%

Zurek R., Bucka H.

Oceanological and Hydrobiological Studies

2004

issue 3

69-81

The distribution of algae and zooplankton on two transects across reed and Polygonum stands was observed. The algal community in the Polygonum stand had a mosaic structure mainly comprised of green algae plus desmids and diatoms (Pediastrum simplex, Scenedesmus acutus, Closterium ehrenbergii), whereas blue-green algae (cyanobacteria) Microcystis aeruginosa and Woronichinia naegeliana dominated from the reed boundary towards open waters. Some species, such as Euchlanis dilatata, prefer to be associated with plants, while others, like Synchaeta kitina, are more numerous in open waters. On a windward shore, wind at a velocity of 4 ? 5 m s-1 caused a slow back current from 8 to 18 m h-1. Movements of water were sometimes linear, but at times they developed in two dimensions.

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2 Oceanological and Hydrobiological Studies

1 2004

1 2003

1 Bucka H.

1 Mudrak S.

1 Plinski M.

1 Sapota M.

1 Witek B.

1 Zmijewska M. I.

1 Zurek R.

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

Horizontal distribution of phytoplankton and zooplankton from the littoral towards open waters under wind stress