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5/22/2018 | 2:45 PM - 3:00 PM | ANTHROPOGENIC PRESSURES IN A LARGE TROPICAL RIVER: THE LOWER GRIJALVA IN SOUTHERN MÉXICO | 310 A

ANTHROPOGENIC PRESSURES IN A LARGE TROPICAL RIVER: THE LOWER GRIJALVA IN SOUTHERN MÉXICO

Dam building and land use change are among the major threats to river ecosystems. Temporal changes in hydrology and nutrient concentrations were studied on the Grijalva, a large tropical river in southern Mexico by analyzing long-term discharge and nutrient data. Four hydroelectric dams operate in the Grijalva and conversion from forest into agriculture, pasture, and urban areas has altered the watershed. Seasonal patterns in nutrient concentrations were also compared among tributaries in the lower Grijalva by collecting additional water samples. Seasonal and long-term patterns in discharge differed between the unregulated and regulated sites probably related to dam operation. Nitrate concentration has increased through the years, which may be attributed to the expansion of agricultural and urban areas. In contrast, total phosphorus seemed to decline at sites influenced by dam operation. Higher nitrate and total phosphorus concentrations were detected in tributaries draining intensive agricultural and urban areas. These changes in the hydrology and nutrient concentrations may negatively alter local fisheries, drinking water sources, and the integrity of coastal zones on the Gulf of Mexico

Nutrients
Dams
Landuse

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Presenters/Authors

Mercedes Castillo (), El Colegio de la Frontera Sur, México, mmcastilloecosur@gmail.com;