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Oder discharge environmental response

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Szczecin Lagoon is a shallow, land-locked estuary receiving the Oder discharge and communicating with Pomeranian Bay in the Baltic Sea via 3 narrow outlets (2 of which are in Poland), the Bay forming thus a secondary estuary to the river.
The Lagoon is mostly a depositional area and as such acts as a major sink for the particulate and dissolved material carried by the Oder. Over the recent decades, the lagoon has become grossly polluted and eutrophic, a situation enhanced by its topography and limited water exchange with the Baltic.
The net effect of the exchange is an outflow of the Lagoon's water into the Pomeranian Bay, as a result of which the coastal areas adjacent to the outflow sites bear the brunt of discharge effects in terms of both sediment modification (increased accumulation of silt) and alterations in benthic communities.

The objective of the study will be to document effects the Oder discharge has on distribution, composition, density, and biomass of living components of the benthic system in both the primary (Oderhaff) and second (Pomeranian Bay) estuaries of the Oder.

The study will be completed during one year.
It is proposed to sample benthic biota in the Lagoon and in the Pomeranian Bay using a spatial design such that it would make it possible to detect effect of the discharge in the macro-, meio-, and micro-organisms of the benthos.
The Lagoon will be sampled along the riverine gradient, while the Pomeranian Bay will be sampled at a number of stations situated in the coastal zone near river discharge sites and away from them.
Sampling cruises in both areas will take place in spring and autumn 1994. The parameters analysed will include: water (surface and near bottom layer): temperature, salinity, dissolved oxygen, chlorophyll a + phaeopigments, total suspended solids sediment: grain size/silt content, organic matter content, chlorophyll a + phaeopigments biota: macrobenthos, meiobenthos, bacteria The project will be carried out by the staff of Department of Oceanography (Dr Teresa Radziejewska, Prof.
Idzi Drzycimski, Dr Jerzy Maslowski) supplemented by two scientists from other departments of the Academy of Agriculture in Szczecin (Dr Elzbieta Daczkowska-Kozon and Dr Marek Kurpios).
Department of Oceanography has for a number of years been involved in studies on dynamics of benthic communities in the Southern Baltic and its estuarine areas (Pomeranian Bay, Szczecin Lagoon) in relation to environmental variables.

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