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Environmental characteristics, landscape history and pressures on three coastal lagoons in the Southern Mediterranean Region: Merja Zerga (Morocco), Ghar El Melh (Tunisia) and Lake Manzala (Egypt)

  • NORTH AFRICAN COASTAL LAGOONS
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Abstract

Three North African coastal lagoons were selected as primary sites for integrated ecological and hydrological monitoring and modelling as part of the MELMARINA Project (see Flower & Thompson, 2009). The three sites, Merja Zerga (13.2 km2, Morocco), Ghar El Melh (35.6 km2, Tunisia) and Lake Manzala (c. 700 km2, Egypt), are permanent water bodies with at least one well-defined connection with the sea. This article provides an account of each lagoon’s physical characteristics and recent development including the impacts of human activities. The two sites on the Mediterranean (Ghar El Melh and Lake Manzala) are characterised by small tidally driven variations in water level whilst Merga Zerga, on the Atlantic coast, experiences large tidally induced water level variations and so contains large inter-tidal environments. All the three lagoons receive freshwater inflows from their landward margins, varying in magnitude, seasonality and ecological significance. Freshwater inflows from drains strongly influence ecological conditions within Lake Manzala. All the three lagoons have significant biodiversity interest, especially for resident and migratory birds as well as fish, and support local human populations. Each lagoon experienced significant changes during the twentieth century possibly affecting declines in biodiversity value. These largely resulted from agricultural expansion and intensification and include reclamation and hydrological modifications which have both decreased freshwater inflows due to upstream diversions (Merja Zerga and Ghar El Melh) and increased the influx of freshwater through the return of irrigation drainage (Merja Zerga and Lake Manzala). All three sites experienced nutrient enrichment due to agricultural runoff and discharge of domestic wastewater. Industrial waste discharge is a particular, but not exclusive, problem for Lake Manzala. Problems of water quantity and quality will increase through the twenty-first century with increasing demands for water while effects of climate change will enhance freshwater scarcity. Conflicts between human and environmental uses of water will increase and unless improvements in water use efficiency and wastewater treatment can be brought about wetlands including coastal lagoons are likely to suffer further loss and degradation. These problems will be compounded by sea level rise.

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Acknowledgements

The MELMARINA Project was financed by the EU Framework V INCO-Med Programme (Grant ICA3-CT2002-10009). The authors acknowledge the assistance of all the partner institutions in the project. Geoffrey Tassie (UCL Institute of Archaeology) provided some information on the archaeological significance of the primary lagoons.

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  1. Faculté des Lettres et Sciences Humaines de Sousse, Département de Géographie, Université de Sousse, Cité Erryad, B.P. 547, 4029, Sousse, Tunisia

    F. Ayache, A. Boujarra, F. Rouatbi & H. Makina

  2. UCL Department of Geography, Wetland Research Unit/Environment Change Research Centre, University College London, Gower Street, London, WC1E 6BT, UK

    J. R. Thompson & R. J. Flower

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  1. F. Ayache
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Guest editors: J. R. Thompson & R. J. Flower

Hydro-ecological Monitoring and Modelling of North African Coastal Lagoons

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Ayache, F., Thompson, J.R., Flower, R.J. et al. Environmental characteristics, landscape history and pressures on three coastal lagoons in the Southern Mediterranean Region: Merja Zerga (Morocco), Ghar El Melh (Tunisia) and Lake Manzala (Egypt). Hydrobiologia 622, 15–43 (2009). https://doi.org/10.1007/s10750-008-9676-6

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