Growth, nitrogen fixation, and nodularin production by two Baltic Sea cyanobacteria

Article Abstract:

The effects of salinity and temperature on the growth and nitrogen fixation rate of Nodularia spumigena (Ns) and Aphanizomena flos-aquae (Nf) were analyzed from batch cultures of the two Baltic Sea cyanobacteria. The two Baltic Sea cyanobacteria species exhibited different responses to changes in salinity, temperature, irradiance and phosphorus. The growth and nitrogen fixation rate of the two species were also dependent on the level of salinity and temperature. Furthermore, the varied tolerances of the two species were responsible for their spatial and temporal distribution in the Baltic Sea.

Environmental aspects, Microbial growth, Nitrogen-fixing microorganisms

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Genes coding for hepatotoxic heptapeptides (microsystins) in the cyanobacterium anabena strain 90

Article Abstract:

Cyanobacteria are known to produce a wide variety of bioactive compounds of which many are potent toxins that cause health problems for humans as well as animals. Microsystins are found in cyanobacteria of three planktonic genera and since the genes of microsystin biosynthesis from three major producers are known, it is possible to design probes and primers to identify the toxin producers in the environment.

Manufacturing processes, Causes of, Production processes, Toxins, Planktonic bacteria

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Responses of Baltic Sea ice and open-water natural bacterial communities to salinity change

Article Abstract:

The responses of changing salinity on the physiology and structure of the Baltic Sea ice and open-water natural bacterial assemblages are investigated. It is found that overall physiological and community structure responses are parallel in ice-derived and open-water bacterial assemblages which points to a linkage between community structure and physiology.

Salinity, Linkage (Genetics), Baltic Sea

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