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Nitrogen Fixation During Blooms of Nodularia in Coastal Waters and Backwaters of the Arkona Sea (Baltic Sea) in 1974
Author(s) -
Hübel Helmut,
Hübel Marianne
Publication year - 1980
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19800650605
Subject(s) - eutrophication , nitrogen fixation , bloom , nitrogenase , oceanography , baltic sea , plankton , environmental science , nitrogen , heterocyst , nutrient , biology , chemistry , ecology , geology , organic chemistry
Nitrogen fixation was investigated by means of the acetylene reduction method during the development of a water bloom of Nodularia in coastal waters of the Baltic Sea west of the island of Hiddensee and in backwaters showing different degrees of eutrophication. Depending on plankton density, the values found varied greatly. The maximum of nitrogen fixation values found in extremely dense water blooms under special conditions (Baltic Sea, 2250 μg N 2 /l · h; Kleiner Jasmunder Bodden, 374 μg N 2 /l · h) are up to 10 3 times higher than from other parts of the Baltic Sea or from inland waters. The average nitrogenase activity determined for coastal water populations of the Baltic Sea is 2.15 pg N 2 /heterocyst · h and that of the inmost backwaters 0.77 pg N 2 /heterocyst · h. The relationship between N 2 ‐fixation and nutrient content in water is discussed.