Sedimentation patterns of toxin-producing Microcystis morphospecies in freshwater reservoirs

Understanding the annual cycle of Microcystis is essential for managing the blooms of this toxic cyanobacterium. The current work investigated the sedimentation of microcystin-producing Microcystis spp. in three reservoirs from Central Spain during the summer and autumn of 2006 and 2007. We confirme...

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Bibliographic Details
Published in:Toxins 2013-05, Vol.5 (5), p.939-957
Main Authors: Cirés, Samuel, Wörmer, Lars, Carrasco, David, Quesada, Antonio
Format: Article
Language:English
Subjects:
annual cycle
Bacterial Load
Environmental Monitoring
Eutrophication
Fresh Water - microbiology
hepatotoxins
microcystins
Microcystins - analysis
Microcystins - metabolism
Microcystis
Microcystis - isolation & purification
Microcystis - metabolism
sedimentation
settling
Spain
Water Pollutants - isolation & purification
water reservoirs
Water Supply - analysis
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Summary:Understanding the annual cycle of Microcystis is essential for managing the blooms of this toxic cyanobacterium. The current work investigated the sedimentation of microcystin-producing Microcystis spp. in three reservoirs from Central Spain during the summer and autumn of 2006 and 2007. We confirmed remarkable settling fluxes during and after blooms ranging 10(6)-10(9) cells m(-2) d(-1), which might represent 0.1%-7.6% of the organic matter settled. A comprehensive analysis of the Valmayor reservoir showed average Microcystis settling rates (0.04 d(-1)) and velocities (0.7 m d(-1)) that resembled toxin settling in the same reservoir and were above most reported elsewhere. M. aeruginosa settling rate was significantly higher than that of M. novacekii and M. flos-aquae. Despite the fact that colony sizes did not differ significantly in their average settling rates, we observed extremely high and low rates in large colonies (>5000 cells) and a greater influence of a drop in temperature on small colonies (
ISSN:2072-6651
2072-6651
DOI:10.3390/toxins5050939