The paper presents the results of bacteriological investigations relating to the coastal seawater and sandy sediments along the beach in Sopot in an area between the mouths of two streams, Grodowy Potok and Kamienny Potok. The sandy sediments investigated at four sites along a transect perpendicular to the shore contained variable numbers of saprophytic bacteria. In areas close to the littoral zone large numbers of allochthonous bacteria were found. With increasing distance from the waterline their domination declines to the advantage of autochthonous bacteria, an indication of the decreasing influence of anthropogenic pollution.
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