Duong T. T., Le T. P. Q., Dao T. S., Pflugmacher S., Rochelle Newall Emma, Hoang T. K., Vu T. N., Ho C. T., Dang D. K. (2013). Seasonal variation of cyanobacteria and microcystins in the Nui Coc Reservoir, Northern Vietnam. Journal of Applied Phycology, 25 (4), p. 1065-1075. ISSN 0921-8971.
Titre du document
Seasonal variation of cyanobacteria and microcystins in the Nui Coc Reservoir, Northern Vietnam
Année de publication
2013
Auteurs
Duong T. T., Le T. P. Q., Dao T. S., Pflugmacher S., Rochelle Newall Emma, Hoang T. K., Vu T. N., Ho C. T., Dang D. K.
Source
Journal of Applied Phycology, 2013,
25 (4), p. 1065-1075 ISSN 0921-8971
In order to understand the environmental variables which promote the proliferation of cyanobacteria and variation in microcystin concentrations in the Nui Coc reservoir, Vietnam, physicochemical parameters, the occurrence, and abundance of phytoplankton, cyanobacteria, and microcystin concentration were monitored monthly through the year 2009-2010. The relationships between these parameters were explored using principal component analysis (PCA) and Pearson correlation analysis. The phytoplankton community was mainly dominated by the cyanobacterium Microcystis with higher cyanobacteria abundance during summer and autumn season. PCA and Pearson correlation results showed that water temperature and phosphate concentration were the most important variables accounting for cyanobacteria, Microcystis, and microcystin occurrence. Analysis of the toxins by high-performance liquid chromatography demonstrated the presence of two microcystin variants: microcystin-LR (MC-RR) and microcystin-ddRR (MC-ddRR) with total concentrations of the toxins in filtered samples from surface water ranging from 0.11 to 1.52 mu g MC-LR equiv L-1. The high concentrations of microcystin in the Nui Coc reservoir highlighted the potential risk for human health in the basin. Our study underlined the need for regular monitoring of cyanobacteria and toxins in lakes and reservoirs, which are used for drinking water supplies, not only in Vietnam but also in tropical countries.
Plan de classement
Ecologie, systèmes aquatiques [036]
;
Biotechnologies [084]
Description Géographique
VIET NAM
Localisation
Fonds IRD [F B010060559]
Identifiant IRD
fdi:010060559
