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The impact of Odra river waters on the seasonal and spatial distribution of primary production and chlorophyll a concentrations in the Pomeranian Bay in 1996-1997

Ochocki S., Chmielowski H., Nakonieczny J., Zalewski M.

Oceanologia

1999

No. 41 (3)

373-388

Primary production and chlorophyll a concentrations were measured in March and May 1996, July and October 1997. The study was carried out in the coastal zone adjacent to the mouths of the Swina and Dziwna, which together drain over 80% of the waters carried by the river Odra, and in the open Pomeranian Bay. Chlorophyll a concentrations in the entire Pomeranian Bay varied between 0.8 and 16.5 mg m-3. The minimal daily in situ primary production measured in March was 19.3 mgC m-2 d-1, the July maximum was 1238.6 mgC m-2 d-1. The potential primary production ranged from 1.5 to 59.2 mgC m-3 h-1. The rate of photosynthesis expressed as the assimilation number (AN) varied from 0.3 to 6.6 mgC mgchl-1 h-1. The waters of the river Odra reinforce eutrophication in the coastal zone of the Pomeranian Bay. The photosynthetic rate there is usually higher than in open bay waters.

Photosynthetic light curves in the Pomeranian Bay

Renk H., Ochocki S., Chmielowski H., Gromisz S., Nakonieczny J., Pastuszak M., Zalewski M.

Oceanologia

1999

No. 41 (3)

355-371

Photosynthetic light curves at selected stations in the Pomeranian Bay were determined during four cruises undertaken in March and July 1996, and in May and October 1997. The mean assimilation numbers measured in particular seasons were as follows: spring - 2.46 mgC mgChl-1 h-1, summer - 3.99 mgC mgChl-1 h-1, autumn - 3.24 mgC mgChl-1 h-1 and winter - 2.17 mgC mgChl-1 h-1. A significant correlation was found between the assimilation number and water temperature over the entire period of study. In some seasons a dependence between the assimilation number and nutrient concentrations was also noted. Assimilation numbers in the areas adjacent to the Odra river months were higher than in the offshore zone.