Coastal lagoon environments are characterized by being isolated from the open sea, which makes them highly vulnerable to impacts. This HTH-01-015 the case of the studied area, the Mar Menor lagoon (Murcia, SE Spain), which receives a wide variety of chemical pollutants associated with anthropogenic activities. Its ecological equilibrium is threatened by massive urban growth and intensive agricultural activity (Conesa and Jiménez-Cárceles, 2007). The lagoon receives water run-off from the coastal plain of Campo de Cartagena, which is one of the most important intensive agricultural areas in Europe. At the present time, El Albujón watercourse constitutes the main collector in the Campo de Cartagena drainage system (García-Pintado et al., 2007), maintaining a regular flux fed by groundwater (drainage of irrigated crops) isotopes is only continuous in the last 3–8 km, depending on the season (Velasco et al., 2006).
2. Materials and methods
2.1. Study area and experimental design