The presence of microcystins in the coastal waters of Nigeria, from the Bights of Bonny and Benin, Gulf of Guinea

Kadiri, M. O.; Isagba, Solomon; Ogbebor, Jeffrey U; Omoruyi, Osasere Abike; Unusiotame-Owolagba, T. E.; Lorenzi, Adriana Sturion; Bittencourt‐Oliveira, Maria do Carmo; Chia, Mathias Ahii

doi:10.1007/s11356-020-09740-x

Cited by 6 publications

(7 citation statements)

References 46 publications

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“…Microcystis, Pseudanabaena and Oscillatoria species are the most common and potentially toxic cyanobacteria found in Moroccan freshwater and are the main producers of cyanotoxins. This is also evident in Euro-Mediterranean countries (Filatova et al, 2020), such as in France (Lac de Grand-Lieu), Portugal (Vasconcelos et al, 1996;Moreira et al, 2020), Spain (Quesada et al, 2004), Greece (Christophoridis et al, 2018), and Italy (Bruno et al, 1992), African countries such as Algeria (Saoudi et al, 2017), Ethiopia (Major et al, 2018), and Nigeria (Kadiri et al, 2020). The presence of microcystins in freshwater species of the genus Oscillatoria is not only an ecological problem, but also presents a health risk when water is used for drinking purposes (Lindholm et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

Characterization of cyanobacteria microcystins (cyanotoxins) blooming in the Dams of Northern Morocco

Ouhsassi¹,

Khay²,

Laghdach³

et al. 2021

Afr. J. Environ. Sci. Technol.

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Cyanobacteria thrive in eutrophic freshwaters and impose a serious problem for the management of water bodies. Some Cyanobacteria species impose even a risk for public health due to the production of intracellular toxins. This study is a qualitative approach to determine the degree of toxicity and the toxicological aspect of cyanotoxins in order to setup a monitoring program for cyanobacteria blooms and the management of cyanotoxins thriving in three water bodies in Northern Morocco. Water samples were collected from three major water reservoirs/dams near the city of Tétouan (SMIR, BELMEHDI and NAKHLA). These water samples were screened for possible Cyanobacteria using specific culture media (BG13 & Z8). Three cyanobacteria species (Microcystis aeruginosa, Pseudanabaena galeata and Oscillatoria tenuis) were isolated, purified and lyophilized. Using gas chromatography coupled with mass spectrometry, nine types of microcystins were characterized namely: (MC-LR); (MC-YR); (MC-LA); (MC-FR); (MC-RF), [Mser 7 ]MC-LR; [Dha 7 ]MC-LR; MC-YAba; and [Mser 7]MC-YR. Our results strongly recommend and urge different stakeholders to consider the various health risks potentially generated by these toxins during water use and management. In addition, this study is a contribution to raise awareness of the toxicological aspect of the cyanobacteria inhabiting the water bodies of Northern Morocco.

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Section: Discussionmentioning

confidence: 99%

Characterization of cyanobacteria microcystins (cyanotoxins) blooming in the Dams of Northern Morocco

Ouhsassi¹,

Khay²,

Laghdach³

et al. 2021

Afr. J. Environ. Sci. Technol.

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“…The proposed functions of proteins encoded by the microcystins' biosynthetic gene cluster (mcy) are summarized in Table 2. A pairwise comparison of mcyE gene sequences of samples collected from coastal areas of Nigeria showed identities higher than 86% (query coverage > 96%) with toxic Microcystis strains [12]. Most Nigerian mcyE sequences formed distinct clusters from those of other countries in Africa and other continents (Figure 5).…”

Section: Detection Of Potentially African Microcystin-producing Cyano...mentioning

confidence: 99%

“…blooms from the Lake des Oiseaux shows the highest diversity of microcystins reported from any African aquatic ecosystem [58]. Twelve (12) out of twenty-one (21) putative congeners are fully characterized (MC-RR, MC-LR, MC-FR, MC-WR, MC-YR, MC-LA, MC-(H4)YR, MC-HilR, [Asp 3 ]MC-rAba, [Glu(OCH 3 ) 6 ]MC-LR), [Asp3]MC-HarAba, and [Glu(OCH 3 ) 6 ]MC-FR) (Table 3). Among these congeners, the [Asp3]MC-HarAba and [Glu(OCH 3 ) 6 ]MC-FR are novel congeners found in Algeria.…”

Section: North Africamentioning

confidence: 99%

“…Although comparatively less information exists on the occurrence and distribution of toxic cyanobacterial blooms in West African aquatic ecosystems compared to other parts of Africa, several studies have been conducted to investigate the diversity of potential microcystin producers in the subregion. Kadiri et al [12] investigated the presence and composition of cyanobacteria coupled with microcystin production in several coastal aquatic ecosystems of Southern Nigeria. Substantial biomasses of Microcystis aeruginosa and Planktothrix aghardii were found in almost all investigated aquatic ecosystems.…”

Section: West Africamentioning

confidence: 99%

“…This can be seen on the depicted analogs/congeners (A) Microcystin-AR, (B) Microcystin-LF, (C) Microcystin-LR, (D) Microcystin -LY (Figure 2), and on any of the identified congeners. Despite their environmental importance, microcystin distribution, isoforms, and levels have been scantily investigated in African water bodies [12]. This review aims to highlight existing information regarding cyanobacteria's morphological, genetic, and chemical diversity in water bodies across the East, West, North, and South of Africa.…”

Section: Introductionmentioning

confidence: 99%

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Genetic Diversity of Microcystin Producers (Cyanobacteria) and Microcystin Congeners in Aquatic Resources across Africa: A Review Paper

Chia

Ameh

George

et al. 2022

Toxics

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Microcystins are produced by multifaceted organisms called cyanobacteria, which are integral to Africa’s freshwater environments. The excessive proliferation of cyanobacteria caused by rising temperature and eutrophication leads to the production and release of copious amounts of microcystins, requiring critical management and control approaches to prevent the adverse environmental and public health problems associated with these bioactive metabolites. Despite hypotheses reported to explain the phylogeography and mechanisms responsible for cyanobacterial blooms in aquatic water bodies, many aspects are scarcely understood in Africa due to the paucity of investigations and lack of uniformity of experimental methods. Due to a lack of information and large-scale studies, cyanobacteria occurrence and genetic diversity are seldom reported in African aquatic ecosystems. This review covers the diversity and geographical distribution of potential microcystin-producing and non-microcystin-producing cyanobacterial taxa in Africa. Molecular analyses using housekeeping genes (e.g., 16S rRNA, ITS, rpoC1, etc.) revealed significant sequence divergence across several cyanobacterial strains from East, North, West, and South Africa, but the lack of uniformity in molecular markers employed made continent-wise phylogenetic comparisons impossible. Planktothrix agardhii, Microcystis aeruginosa, and Cylindrospermopsis raciborskii (presently known as Raphidiopsis raciborskii) were the most commonly reported genera. Potential microcystin (MCs)-producing cyanobacteria were detected using mcy genes, and several microcystin congeners were recorded. Studying cyanobacteria species from the African continent is urgent to effectively safeguard public and environmental health because more than 80% of the continent has no data on these important microorganisms and their bioactive secondary metabolites.

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Cyanotoxins in African waterbodies: occurrence, adverse effects, and potential risk to animal and human health

Muluye,

Fetahi,

Engdaw

et al. 2023

Environ Geochem Health

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The presence of microcystins in the coastal waters of Nigeria, from the Bights of Bonny and Benin, Gulf of Guinea

Cited by 6 publications

References 46 publications

Characterization of cyanobacteria microcystins (cyanotoxins) blooming in the Dams of Northern Morocco

Characterization of cyanobacteria microcystins (cyanotoxins) blooming in the Dams of Northern Morocco

Genetic Diversity of Microcystin Producers (Cyanobacteria) and Microcystin Congeners in Aquatic Resources across Africa: A Review Paper

Cyanotoxins in African waterbodies: occurrence, adverse effects, and potential risk to animal and human health

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