

FOLLOWUS
Eco-biology Laboratory for Marine Environments and Coastal Areas, Faculty of Sciences, Marine Sciences Department, University of Badji Mokhtar, Annaba 23000, Algeria
arifsalah23@hotmail.com
Received:28 September 2021,
Accepted:11 November 2021,
Online First:27 June 2022,
Published:01 September 2023
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ARIF Salah,DJEBBARI Nawel,BELHAOUES Saber,et al.Spatio-temporal dynamics of cyanobacterial abundance and toxicity in a Mediterranean hypereutrophic lake[J].Journal of Oceanology and Limnology,2023,41(05):1834-1848.
The Mediterranean basin is considered one of the most vulnerable areas in the world under the impacts of global warming and changes in precipitation patterns. Oubeira
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 toxins. We 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 abundance. The summer/fall period was dominated by
Microcystis
Planktothrix
and in lesser extend by
Cylindrospermum
Cylindrospermopsis
. During the fall/winter transition
Dolichospermum
Pseudanabaena
and
Aphanizomenon
were the dominant genera. Statistically
the bloom-forming cyanobacteria showed significant differences between months but not between stations. Intracellular 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
Planktothrix
.
Microcystis
was more sensitive to nutrients than to temperature.
Planktothrix
was more dependent on temperature than on nutrients
which explains their coexistence during summer-fall period. However
both genera are positively correlated with MC-LR and would probably be the main producers of microcystins.
Pseudanabaena
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 conductivity.
Dolichospermum
showed a strong positive correlation wi
th MC-LR. Oubeira Lake
could serve as a model of how cyanobacteria blooms may develop in lakes within Mediterranean climates.
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