Mohammed Loudiki

Cadi Ayyad University | UCAM · Faculty of Sciences Semlalia

The bryophytic flora of the Rhérhaya valley, located north of the Toubkal National Park (TNP)—Morocco, has been catalogued. To our knowledge, only one systematic study of bryophytes has been carried out so far in this valley (Ros et al., J. Bryol. 22:283–289, 2000). The catalogue resulting from our study contains 67 taxa, including 64 mosses and 3...

Algal biofilms play an essential role in ecosystem functioning, but their physiological and biochemical changes during salt stress remain poorly understood. This study aimed at investigating how biofilm communities react to different salinity in a microcosm experiment and to offer insights into the potential effects of future freshwater salinizatio...

Significant progress has been achieved in the use of biostimulants in sustainable agricultural practices. These new products can improve plant growth, nutrient uptake, crop yield and quality, stress adaptation and soil fertility, while reducing agriculture’s environmental footprint. Although it is an emerging market, the biostimulant sector is very...

In the present study, high-quality activated carbons (ACs) were prepared from a mixture of olive stones and olive mill wastewater (OMWW) through successive hydrothermal carbonization (HTC) and potassium hydroxide (KOH) activation. Textural, morphological, and chemical characteristics of hydrochar (HC) and derived ACs, produced using two KOH/HC rati...

This work aims to assess the anti-cyanobacterial potentialities of the invasive weed Verbesina encelioides against Microcystis aeruginosa growth. In an experimental bioassay, the aqueous extract of the aerial parts of V. encelioides (AEVE) was tested to investigate its activity on M. aeruginosa growth. Several growth parameters and physiological in...

This study aims to use environmental indices as complementary tools to other air quality biomonitoring techniques. The concentrations of trace elements Hg, Se, V, Mo, and Ba were analyzed by ICP-MS in four lichens: Xanthoria calcicola, Xanthoria parietina, Ramalina pollinaria, and Ramalina lacera. To assess the contamination of lichens by trace ele...

This work aims to explore the anti-cyanobacterial potentialities of the weed Oxalis pes-caprae L. on Microcystis aeruginosa growth. In the current study, the aqueous extract of the aerial parts of Oxalis pes-caprae L. (AEOP) was tested to assess its activity on M. aeruginosa growth in an experimental bioassay. The anti-cyanobacterial effect of AEOP...

Atmospheric contamination by metallic trace elements emitted by various human activities constitutes an important threat to human and environmental health. This study aims to determine metal accumulation and the sources of air metallic pollution in the Safi urban-industrial area using lichens as biomonitors. Ten trace elements (As, Cd, Co, Cr, Cu,...

Spatial variation in benthic diatom communities in relation to salinity in the arid Drâa River basin (Southern Morocco)-3709-APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH 20(5):3709-3736. Abstract. Many arid rivers worldwide are under increasing human pressures amplified by hydrological drought and climate change. The Oued Drâa River, Southern Morocco...

The intensive human activities extensively contaminated water sources making its treatment a problem of paramount importance, especially with the increasing of global population and water scarcity. The application of natural coagulants has become a promising and environmentally friendly alternative to conventional ones. This study was aimed at eval...

The increasing occurrence of toxic cyanobacteria in water sources, driven by climate change and eutrophication, is of great concern worldwide today. Cyanobacterial blooms can negatively affect water bodies and generate harmful secondary metabolites, namely microcystins (MCs), which significantly impair water quality. Various adsorbents used for MC...

In recent years, the proliferation of Harmful Cyanobacterial Blooms (CyanoHABs) has increased with water eutrophication and climate change, impairing human health and the environment in relation to water supply. In drinking water treatment plants (DWTPs), the bio-coagulation based on natural coagulants has been studied as an eco-friendly alternativ...

Herbicides are widely released into the environment, e.g., due to their excessive use in modern agriculture, the herbicide levels have been increasing in water bodies. Biochar has recently received considerable attention as a new material for environmental application, including the elimination of contaminants from water sources. This chapter discu...

Phytoplankton is a very important part of the ecosystem and is extremely susceptible to environmental variations. Understanding and evaluating the effects of environmental changes on planktonic populations is central to freshwater ecology. In order to explore the phytoplankton diversity and abundance of two ponds in the arid region of Megarine (Lel...

Background Cyanobacteria are among the first photoautotrophic component of soil microorganism communities which play a key ecological role in nutrient cycles and soil productivity. However, the sustainability of these soil biodiversity ecosystem services is increasingly compromised, especially in urban and peri-urban areas where soils are heavily e...

The extracts of Chara vulgaris (a green macroalgae) were tested to explore its algicidal potential on Microcystis aeruginosa growth. Firstly, the anticyanobacterial effect of both macroalgae aqueous (MAA) and macroalgae etyl acetate (MEA) extracts against M. aeruginosa was assessed using both the paper disc diffusion and microdilution methods. Mini...

Microscopic algae especially diatoms (Class Bacillariophyceae) are an important component of biological soil crusts (or biocrust) communities in arid and semi-arid environments. In Morocco, a largely arid and semi-arid African Mediterranean country, the soil diatom diversity and ecology remain unexplored, unlike aquatic diatoms. This study aims to...

In order to explore an ecological correlation between lichens and global air pollution on the Moroccan Atlantic coast Safi-Essaouira, we used a qualitative approach based on the spatial distribution of lichenic flora, mainly saxicolous, which reflects special environmental pollution conditions. Used as good indicators of air quality, lichens can al...

Increasing toxic cyanobacterial blooms in freshwater demand environmentally friendly solutions to control their growth and toxicity, especially in arid countries, where most drinking water is produced from surface reservoirs. We tested the effects of macrophyte allelochemicals on Microcystis aeruginosa and on the fundamental role of bacteria in nut...

Algaecide substances extracted from terrestrial plants are considered an ecofriendly and promising tool in the biocontrol of harmful cyanobacteria blooms (HCBs). We assessed the inhibitory effects of ethyl acetate (EA) extracts taken from the fresh leaves of three Moroccan medicinal plants (Thymus maroccanus, Origanum compactum and Artemisia herba-...

Diatoms, unicellular siliceous microalgae, are one of the most known groups of eukaryotic algae, commonly used as bioindicators for assessing water quality in aquatic ecosystems. Conversely, studies on terrestrial diatoms as potential bioindicators of soil quality are rather scarce. This study aims to assess the arid suburban soils quality of Marra...

The epilithic diatoms of a periurban watercourse of Casablanca city (Bouskoura stream) were studied from samples taken in 8 stations (distributed in the upstream-downstream direction) for two years (August 2015-July 2017). The recorded diatomic flora consists of 54 species corresponding to 27 genera and belonging to 5 main families: Monoraphids, Na...

Hakkoum et al.: Diversity and spatial distribution of soil cyanobacteria along an altitudinal gradient in Marrakesh area (Morocco)-5527-APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH 18(4):5527-5545. Abstract. Cyanobacteria, are a photoautotrophic component of soil biological crusts in arid areas. They have attracted increasing interest worldwide due t...

Macrophytes are a promising source of bioactive compounds with potential applications in the biocontrol of harmful cyanobacteria blooms. In this study, we investigated the inhibitory effects of extracts from three macrophytes (Nasturtium officinale, Potamogeton natans and Ranunculus aquatilis) on Microcystis aeruginosa. We assessed physiological in...

This study aims to explore the potentiality of Vicia faba seeds and Opuntia ficus indica cladodes, as eco-friendly coagulants, to sanitize water from Microcystis aeruginosa blooms. The effect of factors influencing coagulation-flocculation activity were studied, namely, coagulant dose (5-20 mg/L), pH (5-8), rapid-mixing speed (100-250 rpm) and slow...

The purpose of the study was to assess the water quality in the Sidi Abderrahmane freshwater reservoir (Safi, Morocco). The monitoring data used in the study included physical, chemical, and biological characteristics. The spatial and temporal characteristics of these parameters was evaluated by collecting water samples fortnightly from May 2011 to...

Many studies have demonstrated the effectiveness of algicidal compounds produced by macrophytes against microalgae. The aim of this study was to assess the algicidal activity of seven Moroccan macrophyte ethyl acetate extracts (MEA) to control harmful algal blooms (HABs). The response and sensitivity of prokaryotic toxic cyanobacteria (Microcystis...

Air pollution by metallic trace elements (MTE) has evolved in recent years in Moroccan cities – especially those with significant industrial activities. Biological tools, especially the use of lichens as a bioindicator of heavy metal air pollution, have been receiving world-wide attention. This study aims to evaluate atmospheric pollution of the Mo...

In recent years macrophytes have been considered promising tools in the biocontrol of harmful cyanobacteria blooms (cyanoHABs). In this study, the inhibitory effect of aqueous extracts of Ranunculus aquatilis and Nasturtium officinale on Microcystis aeruginosa growth was assessed via six treatments (0%, 0.1%, 0.25%, 0.50%, 0.75%, and 1% extracts)....

In order to estimate the global air pollution of the Moroccan Atlantic coast Safi-Essaouira, we have used a qualitative approach based on the spatial distribution of saxicolous-calcicolous lichens that reflect special ecological and pollution conditions. The measurement of the beta diversity by the calculation of the Jaccard index makes it possible...

In order to understand initial conditions that promote the first occurrence of a Microcystis aeruginosa bloom and to evaluate its toxic potential, we studied spatio-temporal dynamics of phytoplankton, including Microcystis, microcystins concentrations, the relative proportion of potentially microcystin producing cells and physicochemical parameters...

A review of the existing Moroccan reservoirs studies (number and fields studies) was done to help reveal the strategy used in accordance with the actual challenges. Three major scientific search tool (Scopus, Science Direct and ResearchGate) were used with keywords in English and French (e. g. "Moroccan reservoir", "nutrients", "freshwater", "water...

In search of an ecofriendly algaecide, aqueous extracts of two medicinal plants, Thymus satureioides Coss. and Artemisia herba alba L., were assessed for antialgal activity against Microcystis aeruginosa. An experiment was designed using five treatments (1%, 0.75%, 0.5%,0.25% and 0.1%). The growth of M. aeruginosa, morphological modifications, and...

Plankton is the basis of many food webs and is the main food of aquatic trophic chains. The primary productivity achieved by phytoplankton depends on the availability of nutriments. Phytoplankton biodiversity of two natural connecting lakes (Lella Fatma and Zerzaim) in the region of Megarine in South East of Algeria was studied during the period fr...

In order to find effective measures to control a Moroccan shallow reservoir (Sidi Abderrahmane), a better understanding of phytoplankton composition, abundance, spatial and temporal distribution it is necessary. Trophic level and the stability status were assessed upon the basis of Shannon diversity index (H′), species richness (S), and evenness (J...

The cyanobacterial diversity of Sidi Boughaba, a Moroccan coastal lagoon and Ramsar site, was evaluated and its potentially toxic species were isolated and characterised. This study was the first time that cyanobacterial diversity and cyanotoxin production have been characterised in a Moroccan coastal lagoon. Samples collected in June 2004, July 20...

Leaf aqueous (LA) extracts of medicinal plants Achillea ageratum L. and Origanum compactum Benth. were tested to explore their potential algicidal effects on Microcystis aeruginosa. The growth of M. aeruginosa and cell morphology changes in response to LA extracts was investigated. The concentrations of total phenols, total flavonoids, and total ta...

Dayet-Aaoua lake (DA) is a freshwater aquatic ecosystem of ecological interest, located at a middle Atlas mountains under humid hydrographic basin (Ifran, Morocco) (33° 39′ 10″ N, 5° 02′ 30″ W). This work deals on the toxicity assessment of Microcystis aeruginosa strain isolated from DA lake, using both Artemia bioassay and the highperformance liqu...

Ce travail présente une analyse détaillée sur les cyanotoxines (métabolites secondaires), produites par les Cyanobactéries (algues bleus vertes) toxiques, et connues par leur effet néfaste sur l’Homme, l’animale et le végétale. Un intérêt particulier a été accordé à la définition de différents types de Cyanotoxines (Hépatotoxines, Neurotoxines, Der...

The nutrient cycle in Oualidia lagoon, on the Atlantic Moroccan coast, was studied at both spatial and temporal scales, covering spring and summer conditions. Water samples were collected bimonthly at high tide from March to August during years 2011 and 2012 at six stations distributed throughout the lagoon. The physico-chemistry (temperature, sali...

This study was conducted to monitor, and to assess the water quality of the dam “Yaacoub Al Mansour” recently filled. The monitoring program concerned the evolution of physico-chemical parameters, bacteria indicating fecal contamination, trophic status and cyanobacteria biomass with their associated toxins. This reservoir is located at 65 km southe...

Aguelmam Azizgza (LAZ) and Dayet Afourgah (DAF) are two Moroccan natural lakes located in a humid hydrographic basin of the Middle Atlas Mountains. Both are considered important reservoirs of plant and animal biodiversity. In addition, they are extensively used for recreational and fishing activities and as a water source for irrigation of agricult...

The presence of cyanobacterial toxins in aquatic ecosystems used for drinking water, irrigation or recreational activities, is a major risk to human and environmental health. Several cyanotoxins detection approaches have been developed by their sensitivity and selectivity. This work presents and discusses a synthesis of different analytical techniq...

The first results of the horizontal distribution of the cell abundance and toxicity of Microcystis in the hypereutrophic Moroccan reservoir Lalla Takerkoust are reported. An unexpected spatio-temporal heterogeneity has been shown between Microcystis abundance and microcystins concentrations. The principal determining factors were analyzed in order...

The spatio-temporal variability of the mircophytoplankton community was investigated in the Oualidia lagoon (Atlantic-Morocco). Microphytoplankton structure, composition and distribution were analyzed at six sampling stations during an annual cycle (from June 2011 to May 2012), based on phytoplankton net and bottle samples. A total of 126 taxa belo...

Oualidia lagoon is a very important area of the Atlantic coast, which has been under an increasing anthropogenic pressure for several decades and, contributes to the degradation of the lagoon’s water quality. An descriptif model is developed to study the variation of the nutrients concentration in the water surface throughout the Oualidia lagoon (M...

Seagrasses play a prominent ecological role and support the productivity on which many communities of marine animals feed and reproduce but, unlike their macroalgae and microalgae counterparts, their diversity and extent have never been rigorously documented in Moroccan coasts. In this study we compiled and analyzed the available bibliographic data...

This work focuses on the water column biogeochemical cycle of the Oualidia lagoon (Moroccan Atlantic coast). The study of the biogeochemical cycle requires the evaluation of nutrients distribution, the factors controlling this process and their influence on different compartments of the lagoon environment. Water samples were collected fortnightly f...

The recent establishment of procedures to improve the water quality of lakes (Nador, Moulay Bousselham Sidi Moussa, Oualidia and Khnifiss) (Scheme Development and Water Management) led us to conduct areview of the literature on these lagoons phase, necessary Zainab Damsiri ScienceLib Editions Mersenne : Volume 6 , N ° 140701 ISSN 2111-4706 phase an...

In order to study the setup of a Microcystis bloom and the evolution of its toxic potential, we studied the temporal and vertical variations in Microcystis aeruginosa abundance, microcystins (MC) concentrations (intracellular and extracellular), and the relative proportion of potentially microcystin-producing cells (MC-producing cells) in relation...

The interactions between phytoplankton and zooplankton was studied from march 2009 to April 2011 at seven stations. In spite of large weekly variations in the abundance and community structure, phytoplankton and zooplankton usually showed an obvious inverse relationship during different periods. However, the density of phytoplankton seems to be due...

The interactions between phytoplankton and zooplankton was studied from march 2009 to April 2011 at seven stations. In spite of large weekly variations in the abundance and community structure, phytoplankton and zooplankton usually showed an obvious inverse relationship during different periods. However, the density of phytoplankton seems to be due...

The interactions between phytoplankton and zooplankton was studied from march 2009 to April 2011 at seven stations. In spite of large weekly variations in the abundance and community structure, phytoplankton and zooplankton usually showed an obvious inverse relationship during different periods. However, the density of phytoplankton seems to be due...

The interactions between phytoplankton and zooplankton was studied from march 2009 to April 2011 at seven stations. In spite of large weekly variations in the abundance and community structure, phytoplankton and zooplankton usually showed an obvious inverse relationship during different periods. However, the density of phytoplankton seems to be due...

The interactions between phytoplankton and zooplankton was studied from march 2009 to April 2011 at seven stations. In spite of large weekly variations in the abundance and community structure, phytoplankton and zooplankton usually showed an obvious inverse relationship during different periods. However, the density of phytoplankton seems to be due...

Phytoplankton community in the coastal waters of Oualidia lagoon was characterized from June 2011 to May 2012. Taxonomic composition, abundance and diversity index were determined at six sample sites. A total of 127 species of phytoplankton belonging to two groups viz. bacillariophyceae (81 species) and dinophyceae (46 species) were reported from t...

Phytoplankton community in the coastal waters of Oualidia lagoon was characterized from June 2011 to May 2012. Taxonomic composition, abundance and diversity index were determined at six sample sites. A total of 127 species of phytoplankton belonging to two groups viz. bacillariophyceae (81 species) and dinophyceae (46 species) were reported from t...

Les lagunes sont des milieux de transition entre les océans et les continents et sont souvent soumises à un hydrodynamisme complexe. Notre étude qui traite la comparaison des des paramètres physico-chimiques (Température et salinité) et les éléments nutritifs (Phosphate et nitrite) à marée haute au niveau de trois lagunes marocaines (Nador, Oualidi...

First report on the occurrence of ichthyotoxic yellow tides of Prymnesium parvum Carter (Haptophyceae) in Oued Mellah hypertrophic lake (Morocco) The Prymnesiophyceae or Haptophyceae (Chrysophyta) contain species-forming spectacular blooms named yellow tides. Among Haptophyceae, Prymnesium parvum, Prymnesium patelliferum and Chrysochromulina polyl...

This study we represent biogeochimical cycle of the water column of the Oualidia Lagoon (Moroccan Atlantic coastline). Water samples were collected from March 2011 until August 2011, at six stations distributed throughout the Oualidia lagoon. The results of physico-chemical parameters measured (temperature, salinity, dissolved oxygen, conductivity...

The Oualidia lagoon is one of the most perturbed parts of the Moroccan Atlantic Ocean due to the nutrient discharges. To contribute to the understanding of eutrophication trends in this lagoon a machine learning tool for induction of models in form of regression trees and in form of set of rules was applied on a data set comprising chemical and bio...

Modélisation des nutriments (Azote et phosphore) Modélisation du phytoplancton

Ce travail porte sur l’étude de cycle biogéochimique de la colonne d’eau de la lagune Oualidia (côte Atlantique, Maroc). L’étude du cycle biogéochimique nécessite l’évaluation de la distribution des éléments nutritifs, les facteurs qui les contrôlent, leurs influencent sur les différents compartiments du milieu lagunaire. Des échantillons d’eau on...

Les toxines produites par les cyanobactéries constituent une vraie menace pour la santé humaine et animale, en raison du risque de promotion du cancer en cas d’ingestion chronique des microcystines indirectement par l’alimentation ou directement dans l’eau potable. (International Agency for Research on Cancer, 2006; Ibeling et Havens, 2008). Et afi...

The aim of this paper is to determine the seasonal succession, overall structure, diversity spatial and temporal of phytoplankton populations of the Massa-lagoon estuary, situated in the biological reserve of Massa. This reserve is situated in the heart of the National Park of Souss Massa in southern Morocco and indeclared in the area protected by...

Modélisation des cycles biogéochimiques dans la lagune de Oualidia

In this study, the zooplankton structure and the water quality of Massa Lagoon were investigated. Samples were collected biweekly at the three stations for 6 months from winter to summer 2008. Results show that the state of the lagoon is a hyper-eutrophic environment, characterized by high levels of chlorophyll-a and nitrogen. Pollution-tolerant zo...

Le lac réservoir Lalla Takerkoust est un hydrosystème complexe fragile et sans cesse sujet à des phénomènes d’envasement, d’eutrophisation et des blooms à cyanobactéries. Pour optimiser la gestion et prévoir l’évolution de cet écosystème on a fait appel à la modélisation afin d’établir un modèle prédictif à long terme.

The biological reserve of Massa, situated in the National Park of Souss Massa, certified Ramsar has a global interest in birdlife. The functioning of the lagoon is affected by the problems of eutrophication, declining water levels, lack of communication with the sea. This work represents a first contribution to the study of the plankton community l...

Mansour Eddahbi (MED) (30°55′N, 6°53′W) and Almassira (ALM) (31°95′N, 6°72′W) are two Moroccan lake reservoirs located at an arid and semi-arid hydrographic basin, respectively. Both are used for irrigation, recreational activities and drinking-water production. This paper deals with the characterization and quantification of microcystins (MC) from...

Experiments in batch cultures under controlled sub-optimal light and temperature conditions were undertaken to determine the effect of nitrogen, phosphorus and N:P ratios on the growth of Microcystis ichthyoblabe Kütz. 1843 and Anabaena aphanizomenoides Forti 1912, two toxic cyanobacteria forming blooms from Oued Mellah lake. Phosphorus experiments...

Research on the ecology, biodiversity and toxicology of cyanobacteria in Moroccan inland waters has been carried out since 1994. The results demonstrate the existence of several taxa of cyanobacteria. Most of them are toxic, bloom‑forming species present in various water bodies of the country. The present study follows upon this earlier work and sp...

The effect of light and temperature on the growth of Microcystis ichthyoblabe and Anabaena aphanizomenoides, isolated from the subtropical Oued Mellah lake, Morocco (33°30′N–07°20′W), were investigated in batch culture. Growth rates at 66 light–temperature combinations were determined and fitted with different mathematical models. The results show...

La vallée de l’Assif Aït Mizane, site d’intérêt biologique et écologique humide (SIBE de priorité 1), situé dans le parc de Toubkal à 70 km au Sud de la ville de Marrakech (31°12’ N, 7° 51’W). Le site constitue une zone rurale d’importance socio économique et d’attraction éco-touristique et connaît par conséquent une forte pression anthropique. Le...

SUMMARY The biotechnological exploitation of microalgae requires more investigations in order to improve our knowledge of their biochemistry and to look for new potentially interesting species. Microalgae are used in various areas. Among them, wastewater treatment in wastewater stabilization ponds and high-rate ponds is widely prévalent. Beside the...

Dans ce travail est présentée la composition biochimique en acides aminés (AA) libres et combinés et en vitamines de Micractinium pusillum isolée à partir du lagunage naturel expérimental de Ouarzazate où cette microalgue prolifère pendant la période chaude. M. pusillum est produite en culture en vrac, sur milieu synthétique, dans des conditions de...

The structure and abundance of phytoplankton communities were investigated during 1997 to 1999 in Oued Mellah, a shallow brackish and hypertrophic lake, with particular regard to Anabaena aphanizomenoides dynamics. Important events of algal blooms were observed mostly by the cyanobacteria Microcystis ichthyoblabe, Anabaena aphanizomenoides and Osci...

The main objective of this study was to determine the importance of secondary mechanism of organic carbon utilization (mixotrophic and heterotrophic modes) in addition to CO2 fixation (photoautotrophic mode) in the green alga, Micractinium pusillum Fresenius (chlorophyta), isolated from a waste stabilization pond. The growth was studied in the pres...

In Morocco, poisoning events of fish, aquatic birds and livestock have been observed in some reservoirs and shallow takes. In all cases, the reasons for animal mortality reasons have not been confirmed and the toxic cyanobacteria strains that were abundant in these water bodies have been suggested as their cause. Since 1994, the authors started tax...

Les algues Prymnesiophyceae ou Haptophyceae (Chrysophyta) renferment des espèces capables de pullulations spectaculaires nommées " marées jaunes ". Parmi les Haptophycées, les plus communes sont : Prymnesium parvum, Prymnesium patelliferum et Chrysochromulina polylepis. Ces microalgues ont été souvent incriminées dans des cas de mortalité aiguë de...

The impact of the wastewater input of Médiouna agglomeration (southeastern area of Casablanca) on the diatom flora and water quality of Oued Hassar stream (Morocco) was studied from July 1997 to August 1998. This wastewater effluent, which was highly loaded with ammonia, orthophosphates and organic matters, had disturbed the diatom assemblages stru...

Hepatotoxic microcystins produced by cyanobacteria represent a significant health hazard. In Morocco, although blooms of cyanobacteria are known to occur frequently in some water-bodies, studies on toxicology and toxinology of these potentially harmful algae have been scarcely developed. This paper presents results of the detection of Microcystin-L...

The Oued Mellah reservoir (33degrees30' N-07degrees20'W) is a shallow brackish lake located 25 km North of Casablanca. A study of the phytoplankton community of this lake shows that it is affected by potentially toxic blooms of Cyanobacteria and Haptophyceae. Microcystis ichthyoblabe (first time recorded from Morocco), Anabaena aphanizoinenoides, O...

In the Lake Oued Mellah cyanobacteria waterblooms occur periodically in late spring and summer with Microcystis ichthyoblabe as the main bloom-forming species. In 1999, a heavy waterbloom of M. ichthyoblabe occurred during May June with a maximal biomass of 298 mg/l. During this period, several bloom samples were collected. The toxicity assessment...

In Morocco, the occurrence of toxic cyanobacteria blooms is confirmed in some water bodies used for recreational and/or as drinking water reservoirs. According to WHO recommendations, the establishment of a monitoring program for microcystins is a necessity. This paper presents toxicological studies of 19 toxic cyanobacteria strains of Microcystis,...