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Spatio-temporal dynamics of cyanobacterial abundance and toxicity in a Mediterranean hypereutrophic lake

海洋湖沼学报(英文) 2023年第5期41卷 1834-1848页

作者： Salah ARIF Nawel DJEBBARI saber belhaoues Hassen TOUATI Mourad BENSOUILAH Eco-biology Laboratory for Marine Environments and Coastal Areas Faculty of SciencesMarine Sciences DepartmentUniversity of Badji MokhtarAnnaba 23000Algeria

The Mediterranean basin is considered one of the most vulnerable areas in the world under the impacts of global warming and changes in precipitation ***,a shallow and polymictic freshwater lake located in northeastern Algeria(36°50′N,08°23′E),has recently experienced a significant proliferation of harmful cyanobacteria resulting in the generation of *** carried out this study in order to understand the succession patterns of dominant cyanobacteria and cyanotoxin production and the factors driving this in Oubeira Lake.A total of 26 cyanobacterial genera were identified,and among them Microcystis and Planktothrix accounted for more than 60%of the overall cell *** summer/fall period was dominated by Microcystis,Planktothrix,and in lesser extend by Cylindrospermum,*** the fall/winter transition,Dolichospermum,Pseudanabaena,and Aphanizomenon were the dominant ***,the bloom-forming cyanobacteria showed significant differences between months but not between *** microcystins(MC-LR)was detected in all collected samples(0.62-and 19.14-μg MC-LR equivalent/L),but appeared in high concentrations throughout the period of dominance of Microcystis and *** was more sensitive to nutrients than to *** was more dependent on temperature than on nutrients,which explains their coexistence during summer-fall ***,both genera are positively correlated with MC-LR and would probably be the main producers of ***,Dolichospermum,and Aphanizomenon co-occurred at the end of Planktothrix dominance period(December).Aphanizomenon and Pseudanabaena were correlated negatively with temperature and positively with water *** showed a strong positive correlation with *** Lake,could serve as a model of how cyanobacteria blooms may develop in lakes within Mediterranean climates.

关键词： Oubeira Lake cyanobacteria microcystin spatiotemporal variations shallow hypereutrophic lake

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