A5072319050- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Aquatic Ecosystems and Biodiversity
- Biocrusts and Microbial Ecology
- Algal biology and biofuel production
- Marine Toxins and Detection Methods
- Water Quality and Pollution Assessment
- Diatoms and Algae Research
- Mediterranean and Iberian flora and fauna
- Constructed Wetlands for Wastewater Treatment
- Microbial Community Ecology and Physiology
- Freshwater macroinvertebrate diversity and ecology
- Plant Growth Enhancement Techniques
- Marine Biology and Environmental Chemistry
- Environmental Chemistry and Analysis
- Heavy metals in environment
- Lichen and fungal ecology
- Marine and coastal plant biology
- Environmental Toxicology and Ecotoxicology
- Coastal and Marine Management
- Adsorption and biosorption for pollutant removal
- Geochemistry and Geologic Mapping
- Phosphorus and nutrient management
- Water management and technologies
- Soil erosion and sediment transport
Cadi Ayyad University
2016-2025
Université de Montréal
2005-2006
Université du Québec à Montréal
2005
Université Laval
2005
Institut National de la Recherche Scientifique
2005
Biologie Labor
2002
Sup de Co Marrakech
2000
In Morocco, the occurrence of toxic cyanobacteria blooms is confirmed in some water bodies used for recreational and/or as drinking reservoirs. According to WHO recommendations, establishment a monitoring program microcystins necessity. This paper presents toxicological studies 19 strains Microcystis, Synechocystis, Pseudanabaena, and Oscillatoria. These were isolated from various including natural lakes, reservoirs, ponds located central regions Morocco. The isolation, culture, biomass...
Cyanobacteria are well known for their biofertilizing capacities, which can enhance soil fertility and plant growth. This study aims to evaluate the effects of indigenous nitrogen-fixing cyanobacterium Anabaena cylindrica on growth, biochemical, physiological responses wheat, as fertility. Medium filtrate, aqueous extract, sonicated culture, crude culture A. at different doses (50%, 25%, 1%, 0.2% v/v) were applied using a drench under greenhouse conditions. After 40 days all cyanobacterial...
Abstract In recent years macrophytes have been considered promising tools in the biocontrol of harmful cyanobacteria blooms (cyanoHABs). this study, inhibitory effect aqueous extracts Ranunculus aquatilis and Nasturtium officinale on Microcystis aeruginosa growth was assessed via six treatments (0%, 0.1%, 0.25%, 0.50%, 0.75%, 1% extracts). Chlorophyll a carotenoid content were analyzed changes cell colonial morphology M. cultures observed. Also, to reveal potential allelochemical compounds,...
Abstract The intensive human activities extensively contaminated water sources making its treatment a problem of paramount importance, especially with the increasing global population and scarcity. application natural coagulants has become promising environmentally friendly alternative to conventional ones. This study was aimed at evaluating efficiency four plant extracts namely Agave americana , Carpobrotus acinaciformis Austrocylindropuntia subulate Senicio anteuphorbium as remove...
In this study, the zooplankton structure and water quality of Massa Lagoon were investigated. Samples collected biweekly at three stations for 6 months from winter to summer 2008. Results show that state lagoon is a hyper-eutrophic environment, characterized by high levels chlorophyll-a nitrogen. Pollution-tolerant such as Brachionus was dominant species in lagoon. A total 61 taxa recorded, including 35 rotifers, 13 copepods, 5 ostracods, protozoa cladocera. Salinity nutrients main...
The aim of this paper is to determine the seasonal succession, overall structure, diversity spatial and temporal phytoplankton populations Massa-lagoon estuary, situated in biological reserve Massa. This heart National Park Souss Massa southern Morocco indeclared area protected by Ramsar Convention 2005. characteristics were studied at four sampling sites on basis data collected monthly intervals, low high tides during a 12 months period. Species (Shannon-Weaver, H), Simpson’s index...
The increasing occurrence of toxic cyanobacteria in water sources, driven by climate change and eutrophication, is great concern worldwide today. Cyanobacterial blooms can negatively affect bodies generate harmful secondary metabolites, namely microcystins (MCs), which significantly impair quality. Various adsorbents used for MC removal from sources were assessed this investigation. Activated carbon constitutes the most widely adsorbent treating contaminated waters due to its high affinity...
Abstract In the Lake Oued Mellah cyanobacteria waterblooms occur periodically in late spring and summer with Microcystis ichthyoblabe as main bloom‐forming species. 1999, a heavy waterbloom of M. occurred during May June maximal biomass 298 mg/l. During this period, several bloom samples were collected. The toxicity assessment was done by mouse brine shrimp ( Artemia ) bioassays. Apart from sample collected on 15/06/1999, all other toxic bioassay. LD 50 determined intraperitoneal injection...
The structure and abundance of phytoplankton communities were investigated during 1997 to 1999 in Oued Mellah, a shallow brackish hypertrophic lake, with particular regard Anabaena aphanizomenoides dynamics. Important events algal blooms observed mostly by the cyanobacteria Microcystis ichthyoblabe, Oscillatoria chlorina ichthyotoxic haptophyceae Prymnesium parvum. proliferated late summer after ichthyoblabe blooms. percentage biomass varied from 88 94 percent bloom periods. Maximum was 146...
Experiments in batch cultures under controlled sub-optimal light and temperature conditions were undertaken to determine the effect of nitrogen, phosphorus N:P ratios on growth Microcystis ichthyoblabe Kütz. 1843 Anabaena aphanizomenoides Forti 1912, two toxic cyanobacteria forming blooms from Oued Mellah lake. Phosphorus experiments show that densities M. A. increased differently various media. Under non-limiting (1000–6960 μg P l−1), 5–7 days exponential was observed, while P-free...
Abstract The effect of light and temperature on the growth Microcystis ichthyoblabe Anabaena aphanizomenoides, isolated from subtropical Oued Mellah lake, Morocco (33°30′N–07°20′W), were investigated in batch culture. Growth rates at 66 light–temperature combinations determined fitted with different mathematical models. results show that two Cyanobacteria grow all intensities temperatures, except 10 °C for A. where was strongly limited. μmax M. increased 0.56 d−1 to 1.32 35 °C. At tested a...
Increasing toxic cyanobacterial blooms in freshwater demand environmentally friendly solutions to control their growth and toxicity, especially arid countries, where most drinking water is produced from surface reservoirs. We tested the effects of macrophyte allelochemicals on Microcystis aeruginosa fundamental role bacteria nutrient recycling. The Ranunculus aquatilis aqueous extract, bioactive four Moroccan extracts, were batch systems M. growth, toxin production oxidative stress response...
A coccoid picocyanobacterium Synechocystis sp. (0.6-2 μm of cell diameter) was found to be dominant during summer period in the experimental wastewater stabilisation pond Marrakesh. The taxonomy this isolated strain confirmed by electron microscope study. general patterns ultrastructure and mode division resemble Chroococcales. cyanobacterium axenic cultured on both inorganic Z8 BG13 media. Mammalian toxicity mice bioassay. major sympton poisoning severe diarrhoea. Histopathological study...
The stabilization pond is one of the more important biological wastewater treatment systems, applied in many countries. An experiment treating by ponds under arid climate Marrakesh (Morocco) has been underway since 1985. experimental installation, made from two lined ponds, received domestic sewage which carried not only organic load but also a significant bacterial and other microorganisms. In this new habitat, cells' behaviour was affected various physico-chemical factors. It appears that...
In Morocco, poisoning events of fish, aquatic birds and livestock have been observed in some reservoirs shallow lakes. all cases, the reasons for animal mortality not confirmed toxic cyanobacteria strains that were abundant these water bodies suggested as their cause. Since 1994, authors started taxonomic, ecological toxicological studies by collecting samples from various lakes ponds. The results show more than 18 out 26 used human supply contained at least one species planktonic...