Ouafa Cherifi | Université Cadi Ayyad (original) (raw)

Papers by Ouafa Cherifi

Research paper thumbnail of The removal of metals (Cd, Cu and Zn) from the Tensift river using the diatom Navicula subminuscula Manguin: A laboratory study

International Journal of Advanced Research in Biological Sciences (IJARBS), Oct 27, 2016

Various biomaterials have shown promise as sorbents to remove heavy metals from polluted waters a... more Various biomaterials have shown promise as sorbents to remove heavy metals from polluted waters at lower cost than conventional wastewater treatment technologies. The aim of this study is to characterize the ability of the freshwater diatom Navicula subminuscula Manguin to biosorb cadmium, copper and zinc from aqueous solutions. Our results indicate that the biosorption of metals by N. subminuscula increased as the initial concentration of metal ions increased in the medium until a concentration of 100-130 mg L-1. Biosorption equilibrium was established in 30 minutes. The maximum metal ions biosorbed was found to be 42, 90 and 127 for 16 10 8 diatoms per liter for Cd, Cu and Zn, respectively. The maximum uptake of metals was obtained at pH 6.0 for Cu and at pH 8.0 for Cd and Zn. An increase in the biosorption of P. lanceolatum was observed with an increase in temperature from 15 to 25°C. The biosorption of all three metal ions followed the Langmuir isotherm. Competitive biosorption of cadmium, copper and zinc ions was also achieved. The FTIR (Fourier Transformed Infra Red spectroscopy) results of algal biomass revealed the different functional groups at the diatom surface that are able to react with metals in the medium. The results all together suggest that N. subminusculacan be used as a biosorbent for an efficient removal of heavy metals from aqueous solutions which temperature and pH values could be close to the mean ones of the Tensiftriver.

Research paper thumbnail of Toxicity and biosorption of chromium from aqueous solutions by the diatom Planothidium lanceolatum (Brébisson) Lange-Bertalot

American journal of scientific and industrial research, Feb 1, 2012

The present study reports the ability of the diatom Planothidium lanceolatum (Brébisson) Lange-Be... more The present study reports the ability of the diatom Planothidium lanceolatum (Brébisson) Lange-Bertalot (P. lanceolatum) to remove hexavalent chromium [Cr(VI)] from aqueous solutions in batch system under varying ranges of pH, contact time and initial ion concentrations by the determination Cr(VI) toxic effects and biosorption by this species. The results show a significant growth of P. lanceolatum for Cr concentrations up to 10 mg L-1. The growth rate decreases as a function of increasing concentrations of Cr(VI). The cultures made with Tensift River water (Marrakech, Morocco) developed in the presence of Cr(VI) concentrations from 0 to 4 mg L-1. But the culture with tannery effluent water grew with concentrations from 0 to 0.152 mg L-1. The IC50 calculated is 8.7 mg L-1 for the artificial growth medium tested which is more than that calculated with river water (3.85 mg L-1) and tannery effluent water (0.075 mg L-1). The biosorption of Cr increases with the decrease of pH. The biosorption capacity calculated from the Langmuir isotherm was 93.45 mg Cr(VI).g diatoms-1 at an initial concentration of 0.4 g dried diatoms per liter with an initial Cr(VI) concentration of 20 mg L-1. The wide ecological valence of this diatom to pollution parameters and the seasonal pattern of its life cycle are the main factors that make the biomonitoring of Cr(VI) by this species feasible.

Research paper thumbnail of The Checklist and the Ecological Index of the Brown Seaweeds from Essaouira Coastline (Morocco)

The aim of the present work is to catalogue the upper subtidal and intertidal brown phytobenthos ... more The aim of the present work is to catalogue the upper subtidal and intertidal brown phytobenthos inhabiting three different coastal areas nearby Essaouira city, extended between 31° 52' N - 9° 75' W North and 31° 49' N - 9° 76' W South. This checklist of Pheophyceae is among the first revised and updated checklist for almost 20 years on the Atlantic Moroccan coastline. A total of 73 taxa belonging to 39 genera were recorded, with an increase of 15% in algal species compared to previous studies. Additionally, the benthic macroalgal species collected in different seasons of the year are shown, as well as a comparative analysis of the Ecological State Groups (ESG) and their Recovery Index (RI) forthe three sampled coastal areas. The ecological data showed that the state of health of the reference station (S1) is good, in comparison to the other two impacted ones (S2 and S3), since the percentage of sensitive species in S1 (51%) is much higher than those in S2 (7%) and S...

Research paper thumbnail of First Assessment of Pollution Impact at Essaouira Coast (Morocco) Using Biotic and Abiotic Parameters and the Red Algae Ellisolandia Elongata as Potential Bioindicator of Organic Pollution

Applied Ecology and Environmental Research, 2020

Environmental pollutants might significantly affect the ecological integrity of coastal waters. B... more Environmental pollutants might significantly affect the ecological integrity of coastal waters. Biological indicators like seaweeds have been used globally to assess water pollution. In the present work, the seaweed Ellisolandia elongata was used to evaluate the pollution status in coastal waters around Essaouira city. Three sites were chosen: One as reference station (S1) and two polluted ones (S2 and S3). Seaweed biodiversity, physiologic parameters of E. elongata, as well as, abiotic parameters were studied. Results showed that at the polluted stations, seaweed biodiversity was significantly lower than in S1. However, the concentrations of Total Suspended Solids, Electrical Conductivity, Biological Oxygen Demand, Chemical Oxygen Demand, Ammonium, and Orthophosphates at S2 were significantly higher than at S1. Metal content of E. elongata remained below detection limit at all stations except for Zn and Cu at S2 considered the most polluted station. With respect to the physiologic parameters, Proline, Glycine Betaine and Polyphenol contents at S2 were above, whereas, Chlorophyll a content and axis length were below those determined at the reference station. From the results it can be concluded that seaweed E. elongata could be a good indicator to determine organic pollution in marine ecosystems.

Research paper thumbnail of Effect of the addition of the calcareous algae on the microstructural properties and filtration performances of membranes manufactured from Ghassoul Moroccan clay

Ceramics International, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Variation spatio-temporelle des métaux traces (Cr, Cu, Pb, Zn) chez la laminariale Saccorhiza polyschides au niveau du littoral de la région d’Essaouira

This preliminary study allowed us to assess the state of health of Essaouira coastline, through t... more This preliminary study allowed us to assess the state of health of Essaouira coastline, through the phytobenthos inventory in 3 stations: a control station (S1: My Bouzektoune) and two stations suspected potentially impacted (S2: Essaouira port station and S3: Bab Doukkala station). Also, by analyzing the concentration of trace metals (Cu, Cr, Pb and Zn) in the Phaeophyceae Saccorhiza polyschides which is common between the 3 stations cited. Seasonal sampling was conducted during 2016 and 2017. The results showed a significant decrease of the phytobenthos specific richness in the polluted stations (S2 and S3) in comparison with the control station (S1). Trace metal analysis into the Laminariale S. polyschides had shown a spatiotemporal variation of the bioaccumulation of the four trace metals. The metal contents are quite higher at S2 and S3 stations than those in S1, justifying the low specific richness of algae in the polluted stations. The spring season has shown that the port station is significantly more polluted than that of Bab Doukkala. The accumulation of metals in the macroalga follows the order Zn> Pb> Cu> Cr. Thus, this macroalga,mong others, should inform on chemical quality of coastline ecosystems.

Research paper thumbnail of Impact of El Abid River Basin Loads on Water Quality of the Bin El Ouidane Lake-Reservoir , Morocco

This study had two aims. Firstly, it aimed to analyze the transport of suspended matter (S.M.) an... more This study had two aims. Firstly, it aimed to analyze the transport of suspended matter (S.M.) and nutrients (nitrogen, phosphorus and silica) by flood water in the El Abid river basin and to establish the S.M. and nutrient loads discharged into the Bin El Ouidane lake. It then tried to assess the influence of flood transport on phytoplankton evolution and on physicochemical parameters at the entrance of the Bin El Ouidane lake during three contrasting hydrological years

Research paper thumbnail of Etude du régime alimentaire de cinq espèces de Cladocères dans la retenue Lalla Takerkoust (Maroc)

Annales De Limnologie-international Journal of Limnology, Dec 1, 1994

L'examen du contenu du tube digestif des Cladocères de la retenue Lalla Takerkoust (Maroc) indiqu... more L'examen du contenu du tube digestif des Cladocères de la retenue Lalla Takerkoust (Maroc) indique clairement la dominance phytoplanctonophage des espèces. Toutes les espèces sont des filtreuses herbivores, se nourrissant essentiellement d'algues. Cependant, chez les classes de petite taille il y a utilisation, en plus des algues, de détritus et de bactéries. La spécificité alimentaire est plus ou moins marquée selon les espèces, surtout chez les Daphnies. Diaphanosoma brachyurum (Lievin 1848) et Ceriodaphnia dubia (Richard 1894) apparaissent comme des filtreurs passifs. Certaines espèces telles C. dubia, D. brachywrùm et Bosmina longirostris (O.F. Muller 1785) ont un éventail alimentaire identique et plus étroit que les autres espèces. Elles se nourrissent de Cyclotella oceilata (Pantocksek), de Schroederia sp. et à'Euglena sp. Par ailleurs, Daphnia lumholtzi (Sars 1886) et Daphnia pulex (Leydig 1860), espèces de grande taille, présentent un spectre alimentaire plus large. En effet, en plus de Cyclotella, Schroederia et Euglena sp, D. lumboltzi s'alimente de Cosmarium laeve (Rabenhorst) alors que D. pulex se nourrit de Cyanophycées et de Dinophycées. La taille des animaux semble être un élément important dans la détermination de la taille des particules ingérées, ce qui confirme les résultats de Burns (1968). Les stades jeunes consomment principalement des micro-algues. A study of the diet of five species of Cladocera in the reservoir Lalla Takerkoust (Morocco)

Research paper thumbnail of Variations de la structure trophique du lac-réservoir oligotrophe Bin El Ouidane (Maroc)

Revue des sciences de l'eau, 2002

L'étude combinée des apports par les crues, du plancton, des contenus algaux du tractus diges... more L'étude combinée des apports par les crues, du plancton, des contenus algaux du tractus digestif des Cladocères et du régime alimentaire de quelques espèces de poissons dans le lac de barrage oligotrophe Bin El Ouidane a permis de dégager les conclusions suivantes : - les apports particulaires et dissous par les crues durant la période d'étude 1995-1997 ont une influence marquée sur la dynamique saisonnière du zooplancton via les changements dans la dynamique du peuplement phytoplanctonique ; - durant les trois années d'étude, le maximum de biomasse zooplanctonique se situe généralement juste après les pics printanier et estival du phytoplancton mettant ainsi en évidence l'importance du zooplancton herbivore dans la chaîne alimentaire pélagique du lac ; - l'étude des contenus algaux du tractus digestif des Cladocères Daphnia longispina, Daphnia lumholtzi, Diaphanosoma brachyurum, Ceriodaphnia dubia, Ceriodaphnia reticulata et Bosmina longirostris a montré que l&#...

Research paper thumbnail of Flood transport of dissolved and suspended matter in the El Abid river basin (Morocco)

Man and River Systems, 1999

This study presents the results of an analysis of the transport of suspended matters (S.M.) and n... more This study presents the results of an analysis of the transport of suspended matters (S.M.) and nutrients (phosphorus, nitrogen and silica) by flood waters in the El Abid river basin, Morocco. The transport dynamics of these elements are considered within the context of temporal variations in discharge, and an evaluation of the loads of these elements supplied by the El Abid river basin to the Bin El Ouidane reservoir is also carried out. An analysis of the S.M. and nutrient dynamics, and their relationship to discharge has led to the identification of three types of flood flow. The first flow type defines storm flows that mainly occur from June-October, inclusive. Despite their low discharges, these are characterized by a high S.M. (up to 250 g l −1). The second flow type occurs during the wet season, generally between December-May inclusive. In contrast to the first flow type, these flood flows are characterized by a relatively higher discharge (up to 204 m 3 s −1) and an S.M. concentration not exceeding 50 g l −1. In contrast, the total phosphorus, nitrogen and silica levels are significantly high and indicate the importance of chemical erosion during flood flows of the wet period. Finally, there are also flood flows of an intermediate type, which are characterized by a moderate discharge (67.5 m 3 s −1-94 m 3 s −1) and a shorter flood duration. This third type exhibits S.M. and nutrient load characteristics common to both other flow types.

Research paper thumbnail of Biomonitoring of Heavy Metal Pollution Using the Brown Seaweed Ericaria Selaginoides Along the Atlantic Coast of Morocco

Applied Ecology and Environmental Research

Increased pollution in the coastal areas may cause changes in the biodiversity of marine organism... more Increased pollution in the coastal areas may cause changes in the biodiversity of marine organisms depending upon their physiological capacity and resilience to thrive under stressing environmental conditions. The present research evaluates the heavy metals pollution degree of coastal waters using the macroalgae Ericaria selaginoides as bioindicator along the Atlantic coast of Morocco. Eight stations were chosen: two located near Eljadida city, three nearby Safi city and three around the city of Essaouira. Results showed that the heavy metal content in the thalli of E. selaginoides, in seawater and sediment varied seasonally. At the same time, it was negatively correlated with algal biodiversity onsite. However, the Chemical Oxygen Demand was significantly higher at the polluted station S5 than at other stations, while Dissolved Oxygen and Biological Oxygen Demand were lower. E. selaginoides accumulated metals in the following order Fe > Zn > Mn > Cu > Ni > Pb > Cr > Cd. In conclusion, E. selaginoides is overall more resilient to heavy metal pollution than other marine organisms in the Atlantic coast of Morocco, as indicated by substantially elevated concentrations of heavy metals in some sites. Our results support that E. selaginoides would be a suitable bioindicator for monitoring of heavy metals in polluted coastal areas.

Research paper thumbnail of The use of seaweeds and abiotic parameters for the biomonitoring of Moroccan coastal areas: case study of Safi City

DESALINATION AND WATER TREATMENT

The establishment of an effective monitoring and assessment system is an important basis for the ... more The establishment of an effective monitoring and assessment system is an important basis for the rehabilitation and restoration of coastal marine aquatic ecosystems. The present work aims to apply, for the first time in Safi area (Morocco), seaweed biotic indices and the physiological parameters of a green seaweed Ulva lactuca, in order to assess the capacity of algal communities to reflect the quality of the aquatic ecosystem in the Atlantic coast of Safi. Additionally, some abiotic parameters were analyzed. We considered three stations for the present study (S1, S2 and S3). Four sampling campaigns were conducted during the year 2018, and 164 algal taxa were identified. The study of the algal biodiversity and physiological analysis (the content of proline and photosynthetic pigments) of a selected cosmopolitan alga reveals a state of stress and indicates instability in this macroalgal ecosystem. Indeed, the values of the specific diversity indices of Shannon (H') and equitability (E) show an increase in pollution at the polluted stations S2 and S3, the industrial and the phosphate station, respectively compared to the reference station S1 of Beddouza. The physico-chemical changes of the coastal waters observed in the impacted sites (pH, nitrogenous and phosphorus) could be due to the anthropogenic pollutants resulting from the intense urban and industrial activities that characterize this industrial city. This observation illustrates the interest of phytobenthos in the biomonitoring and bioassessment of coastal marine ecosystems.

Research paper thumbnail of First assessment of domestic and industrial effluents impact on intertidal zone of Safi coastline (west of Morocco): physicochemical characteristics and metallic trace contamination

DESALINATION AND WATER TREATMENT, 2022

Research paper thumbnail of Algal biomass production in different types of wastewaters under extreme conditions of light and temperature

DESALINATION AND WATER TREATMENT

Microalgae have been considered as a potential feedstock for biomaterial compounds production. In... more Microalgae have been considered as a potential feedstock for biomaterial compounds production. In the southern Mediterranean region, which suffers from water scarcity, using wastewaters as culture media for microalgae cultivation is recommended. Hence, an algal strain is needed, which exhibits high growth under the prevailing temperature and light conditions. To obtain such strains, natural samples were collected from a maturation pond in the Peri-Urban Area of Marrakech (Morocco) and cultivated in different types of wastewaters at light intensity of 1,500 µmol m-2 s-1 and temperature up to 45°C in a batch system. Three types of wastewaters were used: raw, treated, not sterilized treated domestic wastewater from muti-soil layering system and tap water, started with the same concentrations of nitrogen and phosphorus. Results showed Chlorella was the only strain able to grow under the cultivation conditions established. This microalgae was identified by partial rbcL-gene as Chlorella sorokiniana with a genetic similarity of 98.8%, and registered under UCAM 001 (GenBank number MT999855). This finding indicates that the strain can be used for biomass production and phycoremediation process in semi-arid area. In addition, microalgae isolation by dominance could be a fast approach to obtain adapted strains for outdoor mass cultivation.

Research paper thumbnail of The effect of Enteromorpha intestinalis and Corallina elongata on physiological parameters of Zea mays L

Arab Gulf Journal of Scientific Research

Purpose: Algae are living organisms capable of photosynthesis and live mainly in an aquatic envir... more Purpose: Algae are living organisms capable of photosynthesis and live mainly in an aquatic environment (marine or freshwater), and considered as plants like those growing on the soil. It can therefore be used to enrich the soil in organic matter, and mineral elements, as for composting green waste, for example. The objective of this study was to investigate the effect of marine macroalgae Enteromorpha intestinalis (Ulvophycae) and Corallina elongata (Corallinacae) as biofertilizers on the growth of Zea mays L. Method: After rinsing, the algae were ground into a fine powder. The powder obtained from each seaweed was divided into two batches. For the first batch, the seaweed powder (AP), was used directly in the pots one week before planting. Two concentrations, 5% and 10%, were studied. The second batch was used to prepare liquid algal fertilizer (ALF). To determine the mineral composition of each seaweed, X-ray fluorescence analysis was performed. the biofertilizing potential of En...

Research paper thumbnail of First Vertical Exploration of Organometallic Contamination of Sediment at the Fishing Port of Safi (West of Morocco)

This work investigates the level of metallic trace elements (MTEs) and organic matter (OM) vertic... more This work investigates the level of metallic trace elements (MTEs) and organic matter (OM) vertical contamination in the sediments of the Safi fishing port (Atlantic coast of Morocco). The choice of the site, never dredged since its construction and operation, constitutes a first scientific study on a national scale. Two sampling campaigns were carried out on 40 cm deep columns of sediment. The particle size profile of the sediment was studied and the organic matter and MTEs (Cd, Cu and Zn) contents were quantified. The results showed a homogeneous sediment profile over the entire depth with a dominance of medium and fine fractions. The average contents of MTEs revealed a significant state of contamination as well as a non-uniform distribution along the column. The recorded values are several times higher than the standards established by the legislation in force for the dredging operation. In addition, the eco-toxicological risk at the port, estimated through the calculation of var...

Research paper thumbnail of Antioxidant and Antifungal Activity of Some Moroccan Seaweeds Against Three Postharvest Fungal Pathogens

Asian Journal of Plant Sciences, 2022

Research paper thumbnail of Saesonal variation, the ecological index and the potential use of Chlorophyceae and Phaeophyceae of the Moroccan coast Sidi Bouzid Eljadida in the agricultural field

ARTICLE INFO Received May 19,2021 Received in revised form June 28,2021 Accepted June 30,2021 ABS... more ARTICLE INFO Received May 19,2021 Received in revised form June 28,2021 Accepted June 30,2021 ABSTRACT Marine algae are potentially prolific sources of highly bioactive secondary metabolites that might represent useful leads in the development of agriculture, pharmacy, cosmetic among many other fields. In Morocco, advances in seaweed biotechnology were achieved over the last decade, especially in medical and agricultural fields. However, the algal biodiversity and its ecology tend to be less studied. These two aspects give more information about the availability of each species in each period and help to preserve the algal richness for a sustainable use. Along the Moroccan coast, which extends of over than 3400 km, the algal diversity was studied years ago by some authors. The present study aims to update the green and brown seaweeds species in the intertidal zone of the Atlantic coast of Sidi Bouzid, a seaside resort near El Jadida City (Morocco) ranked each year among the beaches ...

Research paper thumbnail of Assessment of the Antifungal and Antioxidant Activities of the Seaweeds Collected from the Coast of Atlantic Ocean, Morocco

Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were... more Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were collected from the Atlantic coast of Morocco in order to assess their antifungal and antioxidant activities. The crude methanolic extracts of 30 samples were screened for in vitro antifungal activities against phytopathogenic fungi Botrytis cinerea and Penicillium digitatum that infect fruits and vegetables. The methanolic extracts of Carpodesmia tamariscifolia, Cystoseira humilis, Carpodesmia mediterranea, Sacchoriza polyschides, Bifurcaria bifurcata, Hypnea musciformis and Caulacanthus ustulatus were considerably active against all fungi depending on seasonal variations in the levels of inhibitory activity. B. cinerea was highly sensitive to most algal extracts than P. digitatum. Phytochemical screening revealed that the most active extracts contain alkaloids, polyphenols and tannins. The antioxidant activity of the algae that possessed high antifungal activity was studied. Methanolic extract of C. tamariscifolia contains high phenolic content while the highest content of flavonoids was found in the C. humilis extract. The organic farming in the context of sustainable agriculture may use such natural products for the management of fungal diseases. With respect to such alternative in an integrated crop disease management program, further studies on these seaweeds are needed.

Research paper thumbnail of Differences in adaptation to light and temperature extremes of Chlorella sorokiniana strains isolated from a wastewater lagoon

Bioresource Technology, 2022

Research paper thumbnail of The removal of metals (Cd, Cu and Zn) from the Tensift river using the diatom Navicula subminuscula Manguin: A laboratory study

International Journal of Advanced Research in Biological Sciences (IJARBS), Oct 27, 2016

Various biomaterials have shown promise as sorbents to remove heavy metals from polluted waters a... more Various biomaterials have shown promise as sorbents to remove heavy metals from polluted waters at lower cost than conventional wastewater treatment technologies. The aim of this study is to characterize the ability of the freshwater diatom Navicula subminuscula Manguin to biosorb cadmium, copper and zinc from aqueous solutions. Our results indicate that the biosorption of metals by N. subminuscula increased as the initial concentration of metal ions increased in the medium until a concentration of 100-130 mg L-1. Biosorption equilibrium was established in 30 minutes. The maximum metal ions biosorbed was found to be 42, 90 and 127 for 16 10 8 diatoms per liter for Cd, Cu and Zn, respectively. The maximum uptake of metals was obtained at pH 6.0 for Cu and at pH 8.0 for Cd and Zn. An increase in the biosorption of P. lanceolatum was observed with an increase in temperature from 15 to 25°C. The biosorption of all three metal ions followed the Langmuir isotherm. Competitive biosorption of cadmium, copper and zinc ions was also achieved. The FTIR (Fourier Transformed Infra Red spectroscopy) results of algal biomass revealed the different functional groups at the diatom surface that are able to react with metals in the medium. The results all together suggest that N. subminusculacan be used as a biosorbent for an efficient removal of heavy metals from aqueous solutions which temperature and pH values could be close to the mean ones of the Tensiftriver.

Research paper thumbnail of Toxicity and biosorption of chromium from aqueous solutions by the diatom Planothidium lanceolatum (Brébisson) Lange-Bertalot

American journal of scientific and industrial research, Feb 1, 2012

The present study reports the ability of the diatom Planothidium lanceolatum (Brébisson) Lange-Be... more The present study reports the ability of the diatom Planothidium lanceolatum (Brébisson) Lange-Bertalot (P. lanceolatum) to remove hexavalent chromium [Cr(VI)] from aqueous solutions in batch system under varying ranges of pH, contact time and initial ion concentrations by the determination Cr(VI) toxic effects and biosorption by this species. The results show a significant growth of P. lanceolatum for Cr concentrations up to 10 mg L-1. The growth rate decreases as a function of increasing concentrations of Cr(VI). The cultures made with Tensift River water (Marrakech, Morocco) developed in the presence of Cr(VI) concentrations from 0 to 4 mg L-1. But the culture with tannery effluent water grew with concentrations from 0 to 0.152 mg L-1. The IC50 calculated is 8.7 mg L-1 for the artificial growth medium tested which is more than that calculated with river water (3.85 mg L-1) and tannery effluent water (0.075 mg L-1). The biosorption of Cr increases with the decrease of pH. The biosorption capacity calculated from the Langmuir isotherm was 93.45 mg Cr(VI).g diatoms-1 at an initial concentration of 0.4 g dried diatoms per liter with an initial Cr(VI) concentration of 20 mg L-1. The wide ecological valence of this diatom to pollution parameters and the seasonal pattern of its life cycle are the main factors that make the biomonitoring of Cr(VI) by this species feasible.

Research paper thumbnail of The Checklist and the Ecological Index of the Brown Seaweeds from Essaouira Coastline (Morocco)

The aim of the present work is to catalogue the upper subtidal and intertidal brown phytobenthos ... more The aim of the present work is to catalogue the upper subtidal and intertidal brown phytobenthos inhabiting three different coastal areas nearby Essaouira city, extended between 31° 52' N - 9° 75' W North and 31° 49' N - 9° 76' W South. This checklist of Pheophyceae is among the first revised and updated checklist for almost 20 years on the Atlantic Moroccan coastline. A total of 73 taxa belonging to 39 genera were recorded, with an increase of 15% in algal species compared to previous studies. Additionally, the benthic macroalgal species collected in different seasons of the year are shown, as well as a comparative analysis of the Ecological State Groups (ESG) and their Recovery Index (RI) forthe three sampled coastal areas. The ecological data showed that the state of health of the reference station (S1) is good, in comparison to the other two impacted ones (S2 and S3), since the percentage of sensitive species in S1 (51%) is much higher than those in S2 (7%) and S...

Research paper thumbnail of First Assessment of Pollution Impact at Essaouira Coast (Morocco) Using Biotic and Abiotic Parameters and the Red Algae Ellisolandia Elongata as Potential Bioindicator of Organic Pollution

Applied Ecology and Environmental Research, 2020

Environmental pollutants might significantly affect the ecological integrity of coastal waters. B... more Environmental pollutants might significantly affect the ecological integrity of coastal waters. Biological indicators like seaweeds have been used globally to assess water pollution. In the present work, the seaweed Ellisolandia elongata was used to evaluate the pollution status in coastal waters around Essaouira city. Three sites were chosen: One as reference station (S1) and two polluted ones (S2 and S3). Seaweed biodiversity, physiologic parameters of E. elongata, as well as, abiotic parameters were studied. Results showed that at the polluted stations, seaweed biodiversity was significantly lower than in S1. However, the concentrations of Total Suspended Solids, Electrical Conductivity, Biological Oxygen Demand, Chemical Oxygen Demand, Ammonium, and Orthophosphates at S2 were significantly higher than at S1. Metal content of E. elongata remained below detection limit at all stations except for Zn and Cu at S2 considered the most polluted station. With respect to the physiologic parameters, Proline, Glycine Betaine and Polyphenol contents at S2 were above, whereas, Chlorophyll a content and axis length were below those determined at the reference station. From the results it can be concluded that seaweed E. elongata could be a good indicator to determine organic pollution in marine ecosystems.

Research paper thumbnail of Effect of the addition of the calcareous algae on the microstructural properties and filtration performances of membranes manufactured from Ghassoul Moroccan clay

Ceramics International, 2019

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Variation spatio-temporelle des métaux traces (Cr, Cu, Pb, Zn) chez la laminariale Saccorhiza polyschides au niveau du littoral de la région d’Essaouira

This preliminary study allowed us to assess the state of health of Essaouira coastline, through t... more This preliminary study allowed us to assess the state of health of Essaouira coastline, through the phytobenthos inventory in 3 stations: a control station (S1: My Bouzektoune) and two stations suspected potentially impacted (S2: Essaouira port station and S3: Bab Doukkala station). Also, by analyzing the concentration of trace metals (Cu, Cr, Pb and Zn) in the Phaeophyceae Saccorhiza polyschides which is common between the 3 stations cited. Seasonal sampling was conducted during 2016 and 2017. The results showed a significant decrease of the phytobenthos specific richness in the polluted stations (S2 and S3) in comparison with the control station (S1). Trace metal analysis into the Laminariale S. polyschides had shown a spatiotemporal variation of the bioaccumulation of the four trace metals. The metal contents are quite higher at S2 and S3 stations than those in S1, justifying the low specific richness of algae in the polluted stations. The spring season has shown that the port station is significantly more polluted than that of Bab Doukkala. The accumulation of metals in the macroalga follows the order Zn> Pb> Cu> Cr. Thus, this macroalga,mong others, should inform on chemical quality of coastline ecosystems.

Research paper thumbnail of Impact of El Abid River Basin Loads on Water Quality of the Bin El Ouidane Lake-Reservoir , Morocco

This study had two aims. Firstly, it aimed to analyze the transport of suspended matter (S.M.) an... more This study had two aims. Firstly, it aimed to analyze the transport of suspended matter (S.M.) and nutrients (nitrogen, phosphorus and silica) by flood water in the El Abid river basin and to establish the S.M. and nutrient loads discharged into the Bin El Ouidane lake. It then tried to assess the influence of flood transport on phytoplankton evolution and on physicochemical parameters at the entrance of the Bin El Ouidane lake during three contrasting hydrological years

Research paper thumbnail of Etude du régime alimentaire de cinq espèces de Cladocères dans la retenue Lalla Takerkoust (Maroc)

Annales De Limnologie-international Journal of Limnology, Dec 1, 1994

L'examen du contenu du tube digestif des Cladocères de la retenue Lalla Takerkoust (Maroc) indiqu... more L'examen du contenu du tube digestif des Cladocères de la retenue Lalla Takerkoust (Maroc) indique clairement la dominance phytoplanctonophage des espèces. Toutes les espèces sont des filtreuses herbivores, se nourrissant essentiellement d'algues. Cependant, chez les classes de petite taille il y a utilisation, en plus des algues, de détritus et de bactéries. La spécificité alimentaire est plus ou moins marquée selon les espèces, surtout chez les Daphnies. Diaphanosoma brachyurum (Lievin 1848) et Ceriodaphnia dubia (Richard 1894) apparaissent comme des filtreurs passifs. Certaines espèces telles C. dubia, D. brachywrùm et Bosmina longirostris (O.F. Muller 1785) ont un éventail alimentaire identique et plus étroit que les autres espèces. Elles se nourrissent de Cyclotella oceilata (Pantocksek), de Schroederia sp. et à'Euglena sp. Par ailleurs, Daphnia lumholtzi (Sars 1886) et Daphnia pulex (Leydig 1860), espèces de grande taille, présentent un spectre alimentaire plus large. En effet, en plus de Cyclotella, Schroederia et Euglena sp, D. lumboltzi s'alimente de Cosmarium laeve (Rabenhorst) alors que D. pulex se nourrit de Cyanophycées et de Dinophycées. La taille des animaux semble être un élément important dans la détermination de la taille des particules ingérées, ce qui confirme les résultats de Burns (1968). Les stades jeunes consomment principalement des micro-algues. A study of the diet of five species of Cladocera in the reservoir Lalla Takerkoust (Morocco)

Research paper thumbnail of Variations de la structure trophique du lac-réservoir oligotrophe Bin El Ouidane (Maroc)

Revue des sciences de l'eau, 2002

L'étude combinée des apports par les crues, du plancton, des contenus algaux du tractus diges... more L'étude combinée des apports par les crues, du plancton, des contenus algaux du tractus digestif des Cladocères et du régime alimentaire de quelques espèces de poissons dans le lac de barrage oligotrophe Bin El Ouidane a permis de dégager les conclusions suivantes : - les apports particulaires et dissous par les crues durant la période d'étude 1995-1997 ont une influence marquée sur la dynamique saisonnière du zooplancton via les changements dans la dynamique du peuplement phytoplanctonique ; - durant les trois années d'étude, le maximum de biomasse zooplanctonique se situe généralement juste après les pics printanier et estival du phytoplancton mettant ainsi en évidence l'importance du zooplancton herbivore dans la chaîne alimentaire pélagique du lac ; - l'étude des contenus algaux du tractus digestif des Cladocères Daphnia longispina, Daphnia lumholtzi, Diaphanosoma brachyurum, Ceriodaphnia dubia, Ceriodaphnia reticulata et Bosmina longirostris a montré que l&#...

Research paper thumbnail of Flood transport of dissolved and suspended matter in the El Abid river basin (Morocco)

Man and River Systems, 1999

This study presents the results of an analysis of the transport of suspended matters (S.M.) and n... more This study presents the results of an analysis of the transport of suspended matters (S.M.) and nutrients (phosphorus, nitrogen and silica) by flood waters in the El Abid river basin, Morocco. The transport dynamics of these elements are considered within the context of temporal variations in discharge, and an evaluation of the loads of these elements supplied by the El Abid river basin to the Bin El Ouidane reservoir is also carried out. An analysis of the S.M. and nutrient dynamics, and their relationship to discharge has led to the identification of three types of flood flow. The first flow type defines storm flows that mainly occur from June-October, inclusive. Despite their low discharges, these are characterized by a high S.M. (up to 250 g l −1). The second flow type occurs during the wet season, generally between December-May inclusive. In contrast to the first flow type, these flood flows are characterized by a relatively higher discharge (up to 204 m 3 s −1) and an S.M. concentration not exceeding 50 g l −1. In contrast, the total phosphorus, nitrogen and silica levels are significantly high and indicate the importance of chemical erosion during flood flows of the wet period. Finally, there are also flood flows of an intermediate type, which are characterized by a moderate discharge (67.5 m 3 s −1-94 m 3 s −1) and a shorter flood duration. This third type exhibits S.M. and nutrient load characteristics common to both other flow types.

Research paper thumbnail of Biomonitoring of Heavy Metal Pollution Using the Brown Seaweed Ericaria Selaginoides Along the Atlantic Coast of Morocco

Applied Ecology and Environmental Research

Increased pollution in the coastal areas may cause changes in the biodiversity of marine organism... more Increased pollution in the coastal areas may cause changes in the biodiversity of marine organisms depending upon their physiological capacity and resilience to thrive under stressing environmental conditions. The present research evaluates the heavy metals pollution degree of coastal waters using the macroalgae Ericaria selaginoides as bioindicator along the Atlantic coast of Morocco. Eight stations were chosen: two located near Eljadida city, three nearby Safi city and three around the city of Essaouira. Results showed that the heavy metal content in the thalli of E. selaginoides, in seawater and sediment varied seasonally. At the same time, it was negatively correlated with algal biodiversity onsite. However, the Chemical Oxygen Demand was significantly higher at the polluted station S5 than at other stations, while Dissolved Oxygen and Biological Oxygen Demand were lower. E. selaginoides accumulated metals in the following order Fe > Zn > Mn > Cu > Ni > Pb > Cr > Cd. In conclusion, E. selaginoides is overall more resilient to heavy metal pollution than other marine organisms in the Atlantic coast of Morocco, as indicated by substantially elevated concentrations of heavy metals in some sites. Our results support that E. selaginoides would be a suitable bioindicator for monitoring of heavy metals in polluted coastal areas.

Research paper thumbnail of The use of seaweeds and abiotic parameters for the biomonitoring of Moroccan coastal areas: case study of Safi City

DESALINATION AND WATER TREATMENT

The establishment of an effective monitoring and assessment system is an important basis for the ... more The establishment of an effective monitoring and assessment system is an important basis for the rehabilitation and restoration of coastal marine aquatic ecosystems. The present work aims to apply, for the first time in Safi area (Morocco), seaweed biotic indices and the physiological parameters of a green seaweed Ulva lactuca, in order to assess the capacity of algal communities to reflect the quality of the aquatic ecosystem in the Atlantic coast of Safi. Additionally, some abiotic parameters were analyzed. We considered three stations for the present study (S1, S2 and S3). Four sampling campaigns were conducted during the year 2018, and 164 algal taxa were identified. The study of the algal biodiversity and physiological analysis (the content of proline and photosynthetic pigments) of a selected cosmopolitan alga reveals a state of stress and indicates instability in this macroalgal ecosystem. Indeed, the values of the specific diversity indices of Shannon (H') and equitability (E) show an increase in pollution at the polluted stations S2 and S3, the industrial and the phosphate station, respectively compared to the reference station S1 of Beddouza. The physico-chemical changes of the coastal waters observed in the impacted sites (pH, nitrogenous and phosphorus) could be due to the anthropogenic pollutants resulting from the intense urban and industrial activities that characterize this industrial city. This observation illustrates the interest of phytobenthos in the biomonitoring and bioassessment of coastal marine ecosystems.

Research paper thumbnail of First assessment of domestic and industrial effluents impact on intertidal zone of Safi coastline (west of Morocco): physicochemical characteristics and metallic trace contamination

DESALINATION AND WATER TREATMENT, 2022

Research paper thumbnail of Algal biomass production in different types of wastewaters under extreme conditions of light and temperature

DESALINATION AND WATER TREATMENT

Microalgae have been considered as a potential feedstock for biomaterial compounds production. In... more Microalgae have been considered as a potential feedstock for biomaterial compounds production. In the southern Mediterranean region, which suffers from water scarcity, using wastewaters as culture media for microalgae cultivation is recommended. Hence, an algal strain is needed, which exhibits high growth under the prevailing temperature and light conditions. To obtain such strains, natural samples were collected from a maturation pond in the Peri-Urban Area of Marrakech (Morocco) and cultivated in different types of wastewaters at light intensity of 1,500 µmol m-2 s-1 and temperature up to 45°C in a batch system. Three types of wastewaters were used: raw, treated, not sterilized treated domestic wastewater from muti-soil layering system and tap water, started with the same concentrations of nitrogen and phosphorus. Results showed Chlorella was the only strain able to grow under the cultivation conditions established. This microalgae was identified by partial rbcL-gene as Chlorella sorokiniana with a genetic similarity of 98.8%, and registered under UCAM 001 (GenBank number MT999855). This finding indicates that the strain can be used for biomass production and phycoremediation process in semi-arid area. In addition, microalgae isolation by dominance could be a fast approach to obtain adapted strains for outdoor mass cultivation.

Research paper thumbnail of The effect of Enteromorpha intestinalis and Corallina elongata on physiological parameters of Zea mays L

Arab Gulf Journal of Scientific Research

Purpose: Algae are living organisms capable of photosynthesis and live mainly in an aquatic envir... more Purpose: Algae are living organisms capable of photosynthesis and live mainly in an aquatic environment (marine or freshwater), and considered as plants like those growing on the soil. It can therefore be used to enrich the soil in organic matter, and mineral elements, as for composting green waste, for example. The objective of this study was to investigate the effect of marine macroalgae Enteromorpha intestinalis (Ulvophycae) and Corallina elongata (Corallinacae) as biofertilizers on the growth of Zea mays L. Method: After rinsing, the algae were ground into a fine powder. The powder obtained from each seaweed was divided into two batches. For the first batch, the seaweed powder (AP), was used directly in the pots one week before planting. Two concentrations, 5% and 10%, were studied. The second batch was used to prepare liquid algal fertilizer (ALF). To determine the mineral composition of each seaweed, X-ray fluorescence analysis was performed. the biofertilizing potential of En...

Research paper thumbnail of First Vertical Exploration of Organometallic Contamination of Sediment at the Fishing Port of Safi (West of Morocco)

This work investigates the level of metallic trace elements (MTEs) and organic matter (OM) vertic... more This work investigates the level of metallic trace elements (MTEs) and organic matter (OM) vertical contamination in the sediments of the Safi fishing port (Atlantic coast of Morocco). The choice of the site, never dredged since its construction and operation, constitutes a first scientific study on a national scale. Two sampling campaigns were carried out on 40 cm deep columns of sediment. The particle size profile of the sediment was studied and the organic matter and MTEs (Cd, Cu and Zn) contents were quantified. The results showed a homogeneous sediment profile over the entire depth with a dominance of medium and fine fractions. The average contents of MTEs revealed a significant state of contamination as well as a non-uniform distribution along the column. The recorded values are several times higher than the standards established by the legislation in force for the dredging operation. In addition, the eco-toxicological risk at the port, estimated through the calculation of var...

Research paper thumbnail of Antioxidant and Antifungal Activity of Some Moroccan Seaweeds Against Three Postharvest Fungal Pathogens

Asian Journal of Plant Sciences, 2022

Research paper thumbnail of Saesonal variation, the ecological index and the potential use of Chlorophyceae and Phaeophyceae of the Moroccan coast Sidi Bouzid Eljadida in the agricultural field

ARTICLE INFO Received May 19,2021 Received in revised form June 28,2021 Accepted June 30,2021 ABS... more ARTICLE INFO Received May 19,2021 Received in revised form June 28,2021 Accepted June 30,2021 ABSTRACT Marine algae are potentially prolific sources of highly bioactive secondary metabolites that might represent useful leads in the development of agriculture, pharmacy, cosmetic among many other fields. In Morocco, advances in seaweed biotechnology were achieved over the last decade, especially in medical and agricultural fields. However, the algal biodiversity and its ecology tend to be less studied. These two aspects give more information about the availability of each species in each period and help to preserve the algal richness for a sustainable use. Along the Moroccan coast, which extends of over than 3400 km, the algal diversity was studied years ago by some authors. The present study aims to update the green and brown seaweeds species in the intertidal zone of the Atlantic coast of Sidi Bouzid, a seaside resort near El Jadida City (Morocco) ranked each year among the beaches ...

Research paper thumbnail of Assessment of the Antifungal and Antioxidant Activities of the Seaweeds Collected from the Coast of Atlantic Ocean, Morocco

Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were... more Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were collected from the Atlantic coast of Morocco in order to assess their antifungal and antioxidant activities. The crude methanolic extracts of 30 samples were screened for in vitro antifungal activities against phytopathogenic fungi Botrytis cinerea and Penicillium digitatum that infect fruits and vegetables. The methanolic extracts of Carpodesmia tamariscifolia, Cystoseira humilis, Carpodesmia mediterranea, Sacchoriza polyschides, Bifurcaria bifurcata, Hypnea musciformis and Caulacanthus ustulatus were considerably active against all fungi depending on seasonal variations in the levels of inhibitory activity. B. cinerea was highly sensitive to most algal extracts than P. digitatum. Phytochemical screening revealed that the most active extracts contain alkaloids, polyphenols and tannins. The antioxidant activity of the algae that possessed high antifungal activity was studied. Methanolic extract of C. tamariscifolia contains high phenolic content while the highest content of flavonoids was found in the C. humilis extract. The organic farming in the context of sustainable agriculture may use such natural products for the management of fungal diseases. With respect to such alternative in an integrated crop disease management program, further studies on these seaweeds are needed.

Research paper thumbnail of Differences in adaptation to light and temperature extremes of Chlorella sorokiniana strains isolated from a wastewater lagoon

Bioresource Technology, 2022