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Papers by hakima zidane

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Jan 10, 2022

The marine environment provides many ecosystems that support habitats biodiversity. Benthic habit... more The marine environment provides many ecosystems that support habitats biodiversity. Benthic habitats and fish species associations are investigated using underwater gears to secure and manage these marine ecosystems in a sustainable manner. The current study evaluates the possibility of using deep learning methods in particular the You Only Look Once version 3 algorithm to detect fish in different environments such as; different shading, low light, and high noise within images and by each frame within an underwater video, recorded in the Atlantic Coast of Morocco. The training dataset was collected from Open Images Dataset V6, a total of 1295 Fish images were captured and split into a training set and a test set. An optimization approach was applied to the YOLOv3 algorithm which is data augmentation transformation to provide more learning samples. The mean average precision (mAP) metric was applied to measure the YOLOv3 model's performance. Results of this study revealed with a mAP of 91,3% the proposed method is proved to have the capability of detecting fish species in different natural marine environments also it has the potential to be applied to detect other underwater species and substratum.

Marine Biodiversity, Jul 12, 2018

The polychaete assemblages at Dakhla Bay (Atlantic coast of South Morocco) were studied during sp... more The polychaete assemblages at Dakhla Bay (Atlantic coast of South Morocco) were studied during spring 2013 and winter 2014 to analyse the spatial-temporal variability in diversity and community structure, as well as their relationships with the main environmental variables. 42 stations were sampled all over the bay, yielding a total of 22 species (21 in spring, 22 in winter) belonging to 16 families. The three most abundant species were Maldane sarsi (25.1%) Eunice vittata (11.1%) and Nainereis laevigata (10%) in spring, and Ophelia rathkei (43%), M. sarsi (21.5%) and N. laevigata (5.9%) in winter. The main drivers of the polychaete community structure at Dakhla Bay were the hydrographic characteristics of the bay as well as the type sediment (in spring and winter) and food availability, organic matter and Chl-a content (in spring). Accordingly, the cluster analysis identified three assemblages in spring and winter, named according to the dominant species. The M. sarsi assemblage occurred in inner bay fine sediments and were replaced by the E. vittata (spring) and N. laevigata (winter) assemblages in mid-bay medium grain-sized sediments, and by the C. tentaculata one in sandy sediments closer to the outer inlet. This represents a shift from a typical brackish, lacunar assemblage to two different, temporal aspects of a marine assemblage, with a transitional one in between. Our study confirms the singularity of the macrofaunal pool at Dakhla Bay and provides a fundamental baseline for future monitoring of an endangered southern Moroccan wetland that will contribute to facilitate its management and protection.

African Journal of Marine Science, 2021

The molluscan assemblages inhabiting the coastal waters of Oualidia Lagoon, Morocco, were studied... more The molluscan assemblages inhabiting the coastal waters of Oualidia Lagoon, Morocco, were studied during winter and summer of 2013. The taxonomic composition and diversity were determined at 43 sample sites. Thirty-four mollusc taxa were recorded in total, including 12 species of bivalves, 20 species of gastropods, 1 species of polyplacophoran and 1 species of cephalopod. Twenty-six of these species are reported here for the first time in Oualidia Lagoon. The gastropod Peringia ulvae and the bivalve Abra alba were the most abundant taxa in both seasons. The deposit-feeder trophic group was highly dominant in both seasons. A classification analysis revealed the existence of three main clusters from downstream to upstream in both seasons: a marine assemblage, a transition assemblage and a lagoon assemblage. Canonical correspondence analyses indicated that the main environmental variables governing the spatial distribution of the molluscs in winter are salinity, temperature and granulometry, whereas in summer they are salinity and granulometry. This study provides a good baseline for future ecological research.

The alien brown seaweed Sargassum muticum (Yendo) Fensholt is currently observed along the coasts... more The alien brown seaweed Sargassum muticum (Yendo) Fensholt is currently observed along the coasts of Morocco. The present study aimed to evaluate the impact of physicochemical parameters on the distribution of S. muticum at four sites on the Atlantic coast of Morocco harvested between 2019 and 2020. This study’s results showed that the highest biomass, thalli length and fertility values were recorded in sampling sites characterized by optimal physicochemical (temperature, pH and salinity) and nutrient H₃PO₄ during summer. The highest biomass values were recorded in August for Sidi Bouzid and Moulay Abdellah sites, conversely, in Saada and Jorf Lasfar sites the highest values were observed in February and Mars respectively. The thallus length was slightly larger in Moulay Abdellah site with 77,30 ± 14.09 cm in compare with the three other sites during summer/spring periods. Minimum thalli length was recorded in September for all studied sites. The thalli of S. muticum were fertile ea...

Since 2012 Moroccan Atlantic coast have witnessed the introduction of the brown alien seaweed Sar... more Since 2012 Moroccan Atlantic coast have witnessed the introduction of the brown alien seaweed Sargassum muticum with a high invasive potential presenting environmental and economic risks. This study evaluates, for the first time, the effect of seasons and location on biochemical composition of S. muticum. Proteins, carbohydrates, lipids, pigments, minerals, and heavy metals were studied during four seasons from spring 2019 to autumn 2020 in four different sites along the Moroccan Atlantic coast (El Jadida, Saada (SA), Sidi Bouzid (SB), Moulay Abdallah (MA) and Jorf Lasfar (JL)). MA present highest proteins content (12.5% dw) during spring and highest levels of lipids and carbohydrates content during summer (1.8% dw and 41.5% dw respectively). Highest chlorophyll a content was found in JL and MA site with (21.6 and 21.45 mg ml− 1 respectively) during winter. Maximum chlorophyll c and carotenoids was found at SA with (2.27 and 9.71 mg ml− 1respectively) during winter. In all locations...

Applied Water Science, 2022

Morocco is a very rich country in terms of wetlands, including bays, estuaries, lagoons, lakes, a... more Morocco is a very rich country in terms of wetlands, including bays, estuaries, lagoons, lakes, and rivers, among others. However, many of them need to be well managed and better exploited, thus requiring baseline descriptive studies to assess faunal patterns and trends. Oualidia lagoon is not an exception. In fact, the studies conducted to date in the lagoon mainly focused on its oceanographic features and aquaculture capacities. The present paper presents the first study on the whole macrofaunal assemblages of Oualidia lagoon, having as main objectives analyze the composition and structure of the assemblages, as well as their relationships with the main environmental variables explaining their spatial distribution variability in the enclosed ecosystem of the Oualidia coastal lagoon. The benthic macroinvertebrates of Oualidia lagoon were studied in summer 2013 based on 43 stations spread over the whole lagoon by using a Van Veen grab. Two replicate samples were collected for macrob...

Environmental science and pollution research international, Jan 20, 2017

Heavy metal assessment in Dakhla Bay (Atlantic coast) was carried out using different environment... more Heavy metal assessment in Dakhla Bay (Atlantic coast) was carried out using different environmental and ecological indices. Heavy metal concentrations were measured using ICP-AES and were compared with consensus-based sediment quality guidelines. The distribution of heavy metal concentrations varies for the three groups: (i) lead distribution is dominated by its associations with copper and chromium. These elements have the same source, most probably related to anthropogenic activities. (ii) Nickel, zinc and cobalt are associated with aluminium and iron indicating their terrigenous origin (natural content), and (iii) cadmium concentration is related to upwelling currents. This paper systematically studied the distributions and pollution levels of heavy metals in sediment in the coastal areas in Dakhla Bay, which is of scientific significance, to discuss the changing rules and the affecting factors of the harmful heavy metals and can be adopted for reference to other coastal areas.

Environmental Technology, 2008

Morocco shelters lagoons, estuaries and bays along its paralic coasts which are among the most pr... more Morocco shelters lagoons, estuaries and bays along its paralic coasts which are among the most productive in the world. The Bay of Dakhla is the longest and the most important site in Morocco due to its halieutic richness. In fact, this bay is an ecosystem with great potential in terms of aquaculture, mainly shellfish farming, and shelters favorable zones for tapiculture, mytiliculture and ostreiculture, in accordance with ecological planning. A hydrological study (temperature, salinity, chlorophyll "a", suspended matter and organic matter) was conducted on a breeding project of the cupped oyster (Crassostrea gigas) installed on the Duna Blanca site since April 2003. A seasonal follow-up of sediment structure was carried out involving granulometric and metallic studies. The hydrological sampling was performed monthly on the surface and at the bottom, during spring tides, low tide and high tide. The results confirmed that the site encompasses a wealth of nutritive elements and a significant chlorophyll-rich biomass. A gradient of hypersalinity is well correlated with seasonal variation of the temperature. The sedimentary structure ranges from muddy-sandy to sandy type. The metal concentrations in the sediments never exceeded the toxicity thresholds. However, the site's production potential cannot be limitless and could be affected by the extension and installation of new conchylaceous farms.

The diversity of anthropic activities generates many effluent containing different pollutants (me... more The diversity of anthropic activities generates many effluent containing different pollutants (metals, pesticides) which are responsible of the hydro system quality degradation. Contrary to organics compounds, the metallic species tend to persist indefinitely, accumulating in living tissues through the food chains. On the seashore ultimate receptacle of micropollution, the benthic seaweeds are the ideal target for micro pollution, thanks to their capacity to bind and to accumulate the metallic cations. The present study relate to: - The analysis of specific wealth seaweed on the coast between two cities of El Jadida and Essaouira and the impact of pollution on the seaweed’s diversity. - The assessment of metallic concentration in seaweed thalli and comparison of their affinities toward some metallic elements. - The selection of seaweed species which can accumulate a specific metallic element or more. The results obtained showed that the micropollution has consequences on the diversi...

Thalassas: An International Journal of Marine Sciences

Thalassas: An International Journal of Marine Sciences

Human and Ecological Risk Assessment: An International Journal

Frontiers in Marine Science

Frontiers in Marine Science

Frontiers in Marine Science

Journal of the Marine Biological Association of the United Kingdom, 2017

The polychaete assemblages inhabiting the coastal waters of the Oualidia lagoon were studied duri... more The polychaete assemblages inhabiting the coastal waters of the Oualidia lagoon were studied during winter 2013 and summer 2013. Taxonomic composition and diversity were determined at 43 sample sites. Among the 13 species of polychaetes recorded, 10 were newly reported for Oualidia lagoon. Hediste diversicolor and Capitella sp. were the most abundant taxa in both seasons. Temperature and salinity were higher, and chl-a and OM were lower, in summer than in winter. The structure of the polychaete assemblages was characterized by forming three main clusters, either based on sampling stations or on polychaete species. These clusters were organized according to a downstream gradient, with the stations having fine sediments and a H. diversicolor assemblage in the inner lagoon being replaced by stations with medium grain-sized sediment and a Capitella sp. assemblage in the mid-lagoon, which were in turn replaced by stations having sandy sediments and assemblages dominated by Glycera alba (...

Environmental Monitoring and Assessment, 2015

The spatial distribution of the molluscan fauna of Oualidia lagoon (Moroccan Atlantic coast) was ... more The spatial distribution of the molluscan fauna of Oualidia lagoon (Moroccan Atlantic coast) was studied during winter 2013. Samples were collected from 43 stations over the whole of the lagoon. Twenty-eight taxa (19 species of gastropods, 7 species of bivalves, 1 species of polyplacophora, and 1 species of cephalopod) were listed, 21 of which are newly reported for Oualidia lagoon. Four taxa, Hydrobia sp. (78.29%), followed by Abra alba (13.99 ), Nassarius pfeifferi (5.07%), and Cerastoderma edule (1.32%), were accounted for 98% of the total abundance. A classification analysis used to characterize the lagoon on the basis of molluscs showed the existence of three main clusters from downstream to upstream: a Nassarius pfeifferi community, a Hydrobia sp.-Abra alba community and a Hydrobia sp.-Cerastoderma edule community.

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Jan 10, 2022

The marine environment provides many ecosystems that support habitats biodiversity. Benthic habit... more The marine environment provides many ecosystems that support habitats biodiversity. Benthic habitats and fish species associations are investigated using underwater gears to secure and manage these marine ecosystems in a sustainable manner. The current study evaluates the possibility of using deep learning methods in particular the You Only Look Once version 3 algorithm to detect fish in different environments such as; different shading, low light, and high noise within images and by each frame within an underwater video, recorded in the Atlantic Coast of Morocco. The training dataset was collected from Open Images Dataset V6, a total of 1295 Fish images were captured and split into a training set and a test set. An optimization approach was applied to the YOLOv3 algorithm which is data augmentation transformation to provide more learning samples. The mean average precision (mAP) metric was applied to measure the YOLOv3 model's performance. Results of this study revealed with a mAP of 91,3% the proposed method is proved to have the capability of detecting fish species in different natural marine environments also it has the potential to be applied to detect other underwater species and substratum.

Marine Biodiversity, Jul 12, 2018

The polychaete assemblages at Dakhla Bay (Atlantic coast of South Morocco) were studied during sp... more The polychaete assemblages at Dakhla Bay (Atlantic coast of South Morocco) were studied during spring 2013 and winter 2014 to analyse the spatial-temporal variability in diversity and community structure, as well as their relationships with the main environmental variables. 42 stations were sampled all over the bay, yielding a total of 22 species (21 in spring, 22 in winter) belonging to 16 families. The three most abundant species were Maldane sarsi (25.1%) Eunice vittata (11.1%) and Nainereis laevigata (10%) in spring, and Ophelia rathkei (43%), M. sarsi (21.5%) and N. laevigata (5.9%) in winter. The main drivers of the polychaete community structure at Dakhla Bay were the hydrographic characteristics of the bay as well as the type sediment (in spring and winter) and food availability, organic matter and Chl-a content (in spring). Accordingly, the cluster analysis identified three assemblages in spring and winter, named according to the dominant species. The M. sarsi assemblage occurred in inner bay fine sediments and were replaced by the E. vittata (spring) and N. laevigata (winter) assemblages in mid-bay medium grain-sized sediments, and by the C. tentaculata one in sandy sediments closer to the outer inlet. This represents a shift from a typical brackish, lacunar assemblage to two different, temporal aspects of a marine assemblage, with a transitional one in between. Our study confirms the singularity of the macrofaunal pool at Dakhla Bay and provides a fundamental baseline for future monitoring of an endangered southern Moroccan wetland that will contribute to facilitate its management and protection.

African Journal of Marine Science, 2021

The molluscan assemblages inhabiting the coastal waters of Oualidia Lagoon, Morocco, were studied... more The molluscan assemblages inhabiting the coastal waters of Oualidia Lagoon, Morocco, were studied during winter and summer of 2013. The taxonomic composition and diversity were determined at 43 sample sites. Thirty-four mollusc taxa were recorded in total, including 12 species of bivalves, 20 species of gastropods, 1 species of polyplacophoran and 1 species of cephalopod. Twenty-six of these species are reported here for the first time in Oualidia Lagoon. The gastropod Peringia ulvae and the bivalve Abra alba were the most abundant taxa in both seasons. The deposit-feeder trophic group was highly dominant in both seasons. A classification analysis revealed the existence of three main clusters from downstream to upstream in both seasons: a marine assemblage, a transition assemblage and a lagoon assemblage. Canonical correspondence analyses indicated that the main environmental variables governing the spatial distribution of the molluscs in winter are salinity, temperature and granulometry, whereas in summer they are salinity and granulometry. This study provides a good baseline for future ecological research.

The alien brown seaweed Sargassum muticum (Yendo) Fensholt is currently observed along the coasts... more The alien brown seaweed Sargassum muticum (Yendo) Fensholt is currently observed along the coasts of Morocco. The present study aimed to evaluate the impact of physicochemical parameters on the distribution of S. muticum at four sites on the Atlantic coast of Morocco harvested between 2019 and 2020. This study’s results showed that the highest biomass, thalli length and fertility values were recorded in sampling sites characterized by optimal physicochemical (temperature, pH and salinity) and nutrient H₃PO₄ during summer. The highest biomass values were recorded in August for Sidi Bouzid and Moulay Abdellah sites, conversely, in Saada and Jorf Lasfar sites the highest values were observed in February and Mars respectively. The thallus length was slightly larger in Moulay Abdellah site with 77,30 ± 14.09 cm in compare with the three other sites during summer/spring periods. Minimum thalli length was recorded in September for all studied sites. The thalli of S. muticum were fertile ea...

Since 2012 Moroccan Atlantic coast have witnessed the introduction of the brown alien seaweed Sar... more Since 2012 Moroccan Atlantic coast have witnessed the introduction of the brown alien seaweed Sargassum muticum with a high invasive potential presenting environmental and economic risks. This study evaluates, for the first time, the effect of seasons and location on biochemical composition of S. muticum. Proteins, carbohydrates, lipids, pigments, minerals, and heavy metals were studied during four seasons from spring 2019 to autumn 2020 in four different sites along the Moroccan Atlantic coast (El Jadida, Saada (SA), Sidi Bouzid (SB), Moulay Abdallah (MA) and Jorf Lasfar (JL)). MA present highest proteins content (12.5% dw) during spring and highest levels of lipids and carbohydrates content during summer (1.8% dw and 41.5% dw respectively). Highest chlorophyll a content was found in JL and MA site with (21.6 and 21.45 mg ml− 1 respectively) during winter. Maximum chlorophyll c and carotenoids was found at SA with (2.27 and 9.71 mg ml− 1respectively) during winter. In all locations...

Applied Water Science, 2022

Morocco is a very rich country in terms of wetlands, including bays, estuaries, lagoons, lakes, a... more Morocco is a very rich country in terms of wetlands, including bays, estuaries, lagoons, lakes, and rivers, among others. However, many of them need to be well managed and better exploited, thus requiring baseline descriptive studies to assess faunal patterns and trends. Oualidia lagoon is not an exception. In fact, the studies conducted to date in the lagoon mainly focused on its oceanographic features and aquaculture capacities. The present paper presents the first study on the whole macrofaunal assemblages of Oualidia lagoon, having as main objectives analyze the composition and structure of the assemblages, as well as their relationships with the main environmental variables explaining their spatial distribution variability in the enclosed ecosystem of the Oualidia coastal lagoon. The benthic macroinvertebrates of Oualidia lagoon were studied in summer 2013 based on 43 stations spread over the whole lagoon by using a Van Veen grab. Two replicate samples were collected for macrob...

Environmental science and pollution research international, Jan 20, 2017

Heavy metal assessment in Dakhla Bay (Atlantic coast) was carried out using different environment... more Heavy metal assessment in Dakhla Bay (Atlantic coast) was carried out using different environmental and ecological indices. Heavy metal concentrations were measured using ICP-AES and were compared with consensus-based sediment quality guidelines. The distribution of heavy metal concentrations varies for the three groups: (i) lead distribution is dominated by its associations with copper and chromium. These elements have the same source, most probably related to anthropogenic activities. (ii) Nickel, zinc and cobalt are associated with aluminium and iron indicating their terrigenous origin (natural content), and (iii) cadmium concentration is related to upwelling currents. This paper systematically studied the distributions and pollution levels of heavy metals in sediment in the coastal areas in Dakhla Bay, which is of scientific significance, to discuss the changing rules and the affecting factors of the harmful heavy metals and can be adopted for reference to other coastal areas.

Environmental Technology, 2008

Morocco shelters lagoons, estuaries and bays along its paralic coasts which are among the most pr... more Morocco shelters lagoons, estuaries and bays along its paralic coasts which are among the most productive in the world. The Bay of Dakhla is the longest and the most important site in Morocco due to its halieutic richness. In fact, this bay is an ecosystem with great potential in terms of aquaculture, mainly shellfish farming, and shelters favorable zones for tapiculture, mytiliculture and ostreiculture, in accordance with ecological planning. A hydrological study (temperature, salinity, chlorophyll "a", suspended matter and organic matter) was conducted on a breeding project of the cupped oyster (Crassostrea gigas) installed on the Duna Blanca site since April 2003. A seasonal follow-up of sediment structure was carried out involving granulometric and metallic studies. The hydrological sampling was performed monthly on the surface and at the bottom, during spring tides, low tide and high tide. The results confirmed that the site encompasses a wealth of nutritive elements and a significant chlorophyll-rich biomass. A gradient of hypersalinity is well correlated with seasonal variation of the temperature. The sedimentary structure ranges from muddy-sandy to sandy type. The metal concentrations in the sediments never exceeded the toxicity thresholds. However, the site's production potential cannot be limitless and could be affected by the extension and installation of new conchylaceous farms.

The diversity of anthropic activities generates many effluent containing different pollutants (me... more The diversity of anthropic activities generates many effluent containing different pollutants (metals, pesticides) which are responsible of the hydro system quality degradation. Contrary to organics compounds, the metallic species tend to persist indefinitely, accumulating in living tissues through the food chains. On the seashore ultimate receptacle of micropollution, the benthic seaweeds are the ideal target for micro pollution, thanks to their capacity to bind and to accumulate the metallic cations. The present study relate to: - The analysis of specific wealth seaweed on the coast between two cities of El Jadida and Essaouira and the impact of pollution on the seaweed’s diversity. - The assessment of metallic concentration in seaweed thalli and comparison of their affinities toward some metallic elements. - The selection of seaweed species which can accumulate a specific metallic element or more. The results obtained showed that the micropollution has consequences on the diversi...

Thalassas: An International Journal of Marine Sciences

Thalassas: An International Journal of Marine Sciences

Human and Ecological Risk Assessment: An International Journal

Frontiers in Marine Science

Frontiers in Marine Science

Frontiers in Marine Science

Journal of the Marine Biological Association of the United Kingdom, 2017

The polychaete assemblages inhabiting the coastal waters of the Oualidia lagoon were studied duri... more The polychaete assemblages inhabiting the coastal waters of the Oualidia lagoon were studied during winter 2013 and summer 2013. Taxonomic composition and diversity were determined at 43 sample sites. Among the 13 species of polychaetes recorded, 10 were newly reported for Oualidia lagoon. Hediste diversicolor and Capitella sp. were the most abundant taxa in both seasons. Temperature and salinity were higher, and chl-a and OM were lower, in summer than in winter. The structure of the polychaete assemblages was characterized by forming three main clusters, either based on sampling stations or on polychaete species. These clusters were organized according to a downstream gradient, with the stations having fine sediments and a H. diversicolor assemblage in the inner lagoon being replaced by stations with medium grain-sized sediment and a Capitella sp. assemblage in the mid-lagoon, which were in turn replaced by stations having sandy sediments and assemblages dominated by Glycera alba (...

Environmental Monitoring and Assessment, 2015

The spatial distribution of the molluscan fauna of Oualidia lagoon (Moroccan Atlantic coast) was ... more The spatial distribution of the molluscan fauna of Oualidia lagoon (Moroccan Atlantic coast) was studied during winter 2013. Samples were collected from 43 stations over the whole of the lagoon. Twenty-eight taxa (19 species of gastropods, 7 species of bivalves, 1 species of polyplacophora, and 1 species of cephalopod) were listed, 21 of which are newly reported for Oualidia lagoon. Four taxa, Hydrobia sp. (78.29%), followed by Abra alba (13.99 ), Nassarius pfeifferi (5.07%), and Cerastoderma edule (1.32%), were accounted for 98% of the total abundance. A classification analysis used to characterize the lagoon on the basis of molluscs showed the existence of three main clusters from downstream to upstream: a Nassarius pfeifferi community, a Hydrobia sp.-Abra alba community and a Hydrobia sp.-Cerastoderma edule community.