Effects of the watershed on the seasonal variation of the surface water quality of a post-restoration coastal wetland: The case of the Nador lagoon (Mediterranean sea, Morocco)

Oujidi, Bouchra; Tahri, Mounia; Layachi, Mostafa; Abid, Abdeslam; Bouchnan, Rachid; Selfati, Mohamed; Bounakhla, M.; Bouch, Mohammed El; Maanan, Mohamed; Bazairi, Hocein; Snoussi, Maria

doi:10.1016/j.rsma.2020.101127

Cited by 11 publications

(14 citation statements)

References 23 publications

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“…For Inani (1995) [81], the concentrations exceeding the SQGs in Marchica Lagoon mainly concern zinc and copper. This study confirmed that concentrations of these trace elements have significantly increased despite the restoration actions realized during the last decade, as proved by the Marchica Lagoon water quality assessment study [82].…”

Section: Discussionsupporting

confidence: 83%

Seasonal and Spatial Patterns of Ecotoxicological Indices of Trace Elements in Superficial Sediments of the Marchica Lagoon Following Restoration Actions during the Last Decade

Oujidi

Bouch²,

Tahri

et al. 2021

Diversity

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Marchica Lagoon, a Ramsar site on the Mediterranean coast of Morocco, is experiencing the impacts of watershed pollution, which includes pollutants from the domestic, agricultural, industrial, and mining sectors. Restoration actions were undertaken around this lagoon during the last decade in order to protect its ecological value and to develop tourist activity. To conserve the biodiversity in the lagoon, it is important to assess the environmental state of this ecosystem. This study aims to evaluate the ecotoxicological state of sediments through the post restoration characterization of the trace elements Pb, Cu, Zn, Cr, Co, and Ba, as well as their correlation to the major elements, grain size, and total organic carbon, sampled during two campaigns (the wet and dry seasons of 2018) across a sampling network of thirteen stations. Multivariate analysis and ecotoxicological risk assessment of the trace elements using the sediment quality guidelines and five pollution indices (geoaccumulation index (Igeo), enrichment factor (EF), contamination factor (CF), pollution-load index (PLI), and mean effect range median quotient (m-ERM-Q)) revealed contamination of the lagoon by Pb, Zn, and Cu, and minimal pollution by Cr, Co, and Ba. The distribution of the biological-risk index reveals that four zones of the lagoon may present a high probability of toxicity, thus constituting potential risk areas for aquatic organisms: during the wet season, the area in the northwestern sandbar border, the southwest eutrophication zone, and the mouth of the stream valley conveying industrial discharges; and during dry season, the northwestern eutrophication zone. Despite the restoration actions achieved around the lagoon, the lead, zinc, and copper concentrations increased, and their variation was significant between group stations. The biodiversity conservation of Marchica Lagoon requires continuous monitoring and assessment, as well as the implementation of an integrated management plan with restoration actions, not only around the lagoon, but also at its watershed level.

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Section: Discussionsupporting

confidence: 83%

Seasonal and Spatial Patterns of Ecotoxicological Indices of Trace Elements in Superficial Sediments of the Marchica Lagoon Following Restoration Actions during the Last Decade

Oujidi

Bouch²,

Tahri

et al. 2021

Diversity

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“…Meanwhile, the influence of land use patterns on the water quality has also been found in a previous study by Giao et al (2021) [25]. Therefore, this study was conducted to monitor the water quality in disturbed (Acacia hybrid-AH and planted Melaleuca cajuputi-PMC) and undisturbed areas (natural Melaleuca cajuputi-NMC) (1) to assess the water quality characteristics in areas with different land use patterns, (2) to analyze the correlation among the water quality parameters, (3) to assess the similarity of the water quality among land use patterns, and (4) to identify key water parameters resulting in seasonal variations of the water quality in the study area. The study results could be useful for water quality monitoring strategies in U Minh Ha National Park.…”

Section: Introductionmentioning

confidence: 73%

“…Wetlands play an important role in the biodiversity and function of ecosystems. A wetland ecosystem is very useful in regulating the climate, filtering harmful substances, ensuring biodiversity, food sources, and creating a livelihood for the surrounding communities [1][2][3][4]. However, social and economic developments have put pressure on wetland ecosystems [4,5].…”

Section: Introductionmentioning

confidence: 99%

The Variation of Water Quality in Three Land Use Types in U Minh Ha National Park, Ca Mau Province, Vietnam Using Multivariate Statistical Approaches

Giao

Truong

2021

Water

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This study was conducted to assess the water quality affected by different land use patterns in U Minh Ha National Park, Ca Mau, Vietnam. This study determined the water quality characteristics in three land use types (Acacia hybrid, planted melaleuca cajuputi, and natural melaleuca cajuputi) at different plant ages on two acid sulfate soil layers in the rainy season (8/2018) and dry season (4/2019) using nine water quality parameters. Multivariate statistical analyses were applied to evaluate the correlation and spatial and temporal variations in the water quality. The study results showed that the water quality in S-ASS was more polluted than that in D-ASS, characterized by low pH; the EC, organic matters (BOD and COD), nutrients (N-NH4+ and N-NO3−), and metal ions (Al3+ and Fe3+) were high; and the EC, BOD, COD, Al3+, and N-NO3− were determined high in D-ASS. The NMC area was noted to have high concentrations of organic matters and nutrients, while the factors specific to acidic soil were found to be higher in the AH and PMC areas. The water quality in the rainy season tended to be more polluted than that in the dry season. The cluster analysis grouped the land use patterns on S-ASS and D-ASS in both seasons into four groups, with a clear similarity between the wet and dry seasons in the areas at various plant ages. The seasonal variations of the water quality of the three land use types were distinguished by the main parameters, including pH, EC, BOD, N-NO3−, and Al3+ (S-ASS) and EC, BOD, N-NO3−, N-NH4+, and Fe3+ (D-ASS). Therefore, there is a need for better water management measures in the rainy season and focus on the key parameters causing water quality variations in each area. The findings in this study provided important information for the future water quality monitoring for both agricultural production and conservation in the national park.

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“…The results show that the level of the lagoons will also rise, as well as there being an increase in temperatures and salinity (especially in those that are less open to the sea) and, therefore, there will be a change in species [70] and a disappearance of lagoons that lose the coastline. The changes that lagoons undergo due to extreme events, such as floods [71,72] or pollution episodes, are also important [73], and in many cases lead to the implementation of restoration measures [74] in order to preserve, in the best possible condition, these places of ephemeral life in geological time.…”

Section: Discussionmentioning

confidence: 99%

Mediterranean Coastal Lagoons Review: Sites to Visit before Disappearance

Soria

Pérez-González

Sòria‐Perpinyà

2022

JMSE

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Coastal lagoons are an established priority habitat in the European environment because of the biological communities that inhabit them. Their origin is related to the transport of sediments from a nearby river or the movement of sands by the marine currents that produce the closure of a gulf. Therefore, they are recent geological formations, which also disappear quickly if environmental conditions change. The 37 coastal lagoons with a surface area greater than 10 km2 located in the Mediterranean basin have been identified. Fishing has been the traditional use of these lagoons, in addition to their use as a navigation harbor when they are open to the sea. Pollution, quality problems and their consequences are the most studied topics in recent publications. Sentinel-2 images taken in the summer of 2020 have been used to study water transparency, suspended matter and chlorophyll a concentration. The result was that only six of them are in good ecological condition, but most of them are eutrophic due to the impacts on their environment and the inflow of poor quality water. The cultural values of these lagoons must also be protected and preserved.

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Effects of the watershed on the seasonal variation of the surface water quality of a post-restoration coastal wetland: The case of the Nador lagoon (Mediterranean sea, Morocco)

Cited by 11 publications

References 23 publications

Seasonal and Spatial Patterns of Ecotoxicological Indices of Trace Elements in Superficial Sediments of the Marchica Lagoon Following Restoration Actions during the Last Decade

Seasonal and Spatial Patterns of Ecotoxicological Indices of Trace Elements in Superficial Sediments of the Marchica Lagoon Following Restoration Actions during the Last Decade

The Variation of Water Quality in Three Land Use Types in U Minh Ha National Park, Ca Mau Province, Vietnam Using Multivariate Statistical Approaches

Mediterranean Coastal Lagoons Review: Sites to Visit before Disappearance

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