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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709271/ https://www.ncbi.nlm.nih.gov/pubmed/23645154 http://dx.doi.org/10.3390/toxins5050939 |
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author | Cirés, Samuel Wörmer, Lars Carrasco, David Quesada, Antonio |
author_facet | Cirés, Samuel Wörmer, Lars Carrasco, David Quesada, Antonio |
author_sort | Cirés, Samuel |
collection | PubMed |
description | 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 (<1000 cells). We found a 4–14 fold decrease in microcystin cell quota in settling Microcystis of the Cogotas and Valmayor reservoirs compared with pelagic populations, and the hypothetical causes of this are discussed. Our study provides novel data on Microcystis settling patterns in Mediterranean Europe and highlights the need for including morphological, chemotypical and physiological criteria to address the sedimentation of complex Microcystis populations. |
format | Online Article Text |
id | pubmed-3709271 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-37092712013-07-12 Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs Cirés, Samuel Wörmer, Lars Carrasco, David Quesada, Antonio Toxins (Basel) Article 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 (<1000 cells). We found a 4–14 fold decrease in microcystin cell quota in settling Microcystis of the Cogotas and Valmayor reservoirs compared with pelagic populations, and the hypothetical causes of this are discussed. Our study provides novel data on Microcystis settling patterns in Mediterranean Europe and highlights the need for including morphological, chemotypical and physiological criteria to address the sedimentation of complex Microcystis populations. MDPI 2013-05-03 /pmc/articles/PMC3709271/ /pubmed/23645154 http://dx.doi.org/10.3390/toxins5050939 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. http://creativecommons.org/licenses/by/3.0/ This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Cirés, Samuel Wörmer, Lars Carrasco, David Quesada, Antonio Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title | Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title_full | Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title_fullStr | Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title_full_unstemmed | Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title_short | Sedimentation Patterns of Toxin-Producing Microcystis Morphospecies in Freshwater Reservoirs |
title_sort | sedimentation patterns of toxin-producing microcystis morphospecies in freshwater reservoirs |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709271/ https://www.ncbi.nlm.nih.gov/pubmed/23645154 http://dx.doi.org/10.3390/toxins5050939 |
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