Growth inhibition and decrease of photosynthetic activity exhibited by selected Microcystis aeruginosa strains exposed to dodecylethyldimethyl-ammonium bromide

The growth inhibition and decrease of photosynthetic oxygen production, induced by dodecylethyldimethyl-ammonium bromide on selected Microcystis aeruginosa strains from Doñana Park, were analyzed. A concentration-dependent growth response was obtained for all strains with the presence of this quaternary ammonium compound in culture medium, and there are significant differences in the sensitive grade exhibited by each one of them.

An immediate decrease of the O2-production activity has been obtained by applying the calculated EC 50(72) values in all strains, although at the end of the time exposure (72 h) only three of the eight selected strains exhibited significant differences among values of both parameters studied. Therefore, it would be necessary to establish a relationship among the quaternary ammonium concentration applied as algaecide treatments in ponds, canals, etc., and the strains involved in the blooms. In addition, the results obtained could be useful as an effective tool to differentiate the specific M. aeruginosa strain involved in the periodic cyanobacterial blooms from Doñana Park and, therefore, the toxic risk associated to these.



Copyright: © Aristotle University of Thessaloniki
Quelle: 2nd International Conference 2009 (Juni 2009)
Seiten: 7
Preis inkl. MwSt.: € 5,00
Autor: M.C. Bartolomé
Ana D’ors de blas
Victoria López-Rodas
Eduardo Costas
Rodriguez Sánchez-Fortún

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