MA8 Ecotoxicology of Tropical Aquatic Environments
A105 & A106
8:00 AM - 12:00 PM, Monday

(74A) Contaminant screening in the agricultural and industrial region of southern Sonora, Mexico.

Villegas-Alvarez, M.1, Garcia-Hernandez, J.1, Cadena-Cardenas, L.1, 1 Centro de Investigacion en Alimentacion y Desarrollo A.C. (CIAD) Guaymas Unit, Guaymas, Sonora, Mexico

ABSTRACT- Intense agriculture and industrial activities in southern Sonora are increasingly affecting the adjacent coastal wetlands. These areas are important for a variety of wildlife including migratory waterfowl, for which are considered an important section of the Pacific Flyway. Southern Sonora wetlands are included in the USDOI winter waterfowl aerial surveys since 1964. Reports from these surveys show a considerable decrease in waterfowl numbers from these wetlands with respect to time. Such decreases can be attributed in part, to the enormous coastal development that this area has experimented in the last 10 years, including agriculture, industry and more recently aquaculture. The aim of the present study is to determine the concentrations of harmful persistent compounds (Cd, Pb, Hg, DDT, DDE, aldrin, dieldrin and endrin) in water samples, sediment cores and fish tissues samples of wetlands affected by the Yaqui and Mayo agricultural and industrial districts. Samples will be collected at the endpoints of water discharges entering the wetlands and from the main body of the wetland. Results will help orient future ecotoxicological research and will also be used to make management recommendations for the improvement and restoration of these important ecosystems.

Key words: south sonora, persistent compounds, bioaccumulation

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