The present study aims to evaluate the initial health status of two stations receiving seawater desalination plants in Agadir Bay (Tifnit-Douira and Cap Ghir) and to assess their potential environmental impact on the marine ecosystem health. Six pairs of mussels (Mytilus galloprovincialis) were collected at six sampling sites on a monthly basis over two years. Each pair was homogenized to obtain the postmitochondrial fractions (S9). Toxicological effects were measured using a multibiomarker approach based on either acetylcholinesterase (AChE), glutathione S-transferase (GST), catalase (CAT), and malondialdehyde (MDA) rate. The results show a seasonal variation of the biomarkers: their activities increase in summer and decrease in spring and winter. High activities were recorded during summer in Cap Ghir (17.94 ± 0.88; 5.91 ± 052 nmol/min/mg of protein) for CAT and MDA, respectively. In Tifnit-Douira, low activities were recorded during winter for GST (3.74 ± 0.52 nmol/min/mg of protein) and during spring for the CAT (3.52 ± 0.45 nmol/min/mg of protein). The fluctuations in the activities of measured biomarkers could be attributed to different factors including the changes in environmental parameters, the influence of seasonal variation, and the contamination of the aquatic ecosystem. The data obtained in this study should be taken into account in the monitoring and management of the health of the ecosystems when the desalination plants are established.


  • Is study was established by using a multidisciplinary approach to assess the coastal ecosystem health by several environmental monitoring programs such as Mussel Watch Program [10,11,12,13]

  • Biomarkers Response in Cap Ghir Station. e seasonal variation of biomarkers in Mytilus galloprovincialis from three sites of Cap Ghir station is illustrated in Figure 2. e results showed that the AChE activity (Figure 2(a)) displays the same tendency of seasonal variations in the three sites of Cap Ghir station. e highest value was observed during summer (7.87 ± 0.38 nmol/min/mg of protein in 2016), and the lowest one was recorded in spring (1.94 ± 0.37 nmol/ min/mg of protein in 2015). e statistical test regarding the three sites does not show any significant difference, except in summer 2015 and spring 2016 using AChE biomarkers

  • Discussion e AChE activity has a seasonal profile, i.e., higher activity in summer and lower one in spring. e difference in AChE activity is noted in the southern sites during the summer of 2015 and spring of 2016 in Cap Ghir and during the summer of 2016 in the North site of Tifnit-Douira

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Is study was established by using a multidisciplinary approach to assess the coastal ecosystem health by several environmental monitoring programs such as Mussel Watch Program [10,11,12,13]. Our research laboratory has often used this approach for several years to evaluate and to follow-up the environmental quality of Agadir Bay ecosystems [14,15,16,17,18,19,20,21,22] It is based on the use of many biomarkers, such as acetylcholinesterase, catalase, glutathione S-transferase, and malondialdehyde, as pollution indicators of seawater quality e Scientific World Journal in the sentinel species (Mytilus galloprovincialis, Perna perna, Donax trunculus, Nereis diversicolor, Cerastoderma edule, etc.). E aims of this work are to study the initial health state of the coast (Tifnit-Douira and Cap Ghir) receiving desalination plants of the seawater in Agadir Bay and to evaluate the potential environmental impact of the installation of these plants on the coastal ecosystem. Our study combined classical research using biodiversity, population structure, and analysis of water and sediment parameters


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