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. The contribution of picocyanobacteria (PCY) to summer phytoplankton blooms,accompanied by an ecological crisis is a new phenomenon in Europe. This issuerequires careful investigation. The present study examined the response ofSynechococcus sp. physiology to different environmental conditions.Three strains of Synechococcus sp. (red BA-120, green BA-124, andbrown BA-132) were cultivated in a laboratory under previously determinedenvironmental conditions. These conditions were as follows: temperature (T)from 10 by 5 to 25 ∘C, salinity from 3 by 5 to 18 PSU, andphotosynthetically active radiation (PAR) from 10 by 90 to280 µmol photons m−2 s−1, which gave 64 combinationsof synthetic, though realistic, environmental scenarios. Scenarios reflectingall possible combinations were applied in the laboratory experiments. Resultspointed to differences in final numbers of cells among strains. However,there was also a similar tendency for BA-124 and BA-132, which demonstratedthe highest concentrations of PCY cells at elevated T and PAR. This wasalso the case for BA-120 but only to a certain degree as the number of cellsstarted to decrease above190 µmol photons m−2 s−1 PAR. Pigmentation,chlorophyll a (Chl a), fluorescence, and rate of photosynthesis presentedboth similarities and differences among strains. In this context, moreconsistent features were observed between brown and red strains when comparedto the green. In this paper, the ecophysiological responses of PCY aredefined.

biogeosciences

Ecophysiological characteristics of red, green, and brown strains of the Baltic picocyanobacterium &amp;lt;i&amp;gt;Synechococcus&amp;lt;/i&amp;gt; sp. – a laboratory study