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(PH219) Long-term temporal and spatial patterns of environmental contaminants at NOAA National Status and Trends sites.
McDonald, S1, Powell, E2, Ramirez, J1, McDonald, T1, Frank, D1, Fay, R1, Brooks, J1, 1 TDI-Brooks International, College Station, Texas, USA2 Rutgers University, Port Norris, New Jersey, USA
ABSTRACT- The National Oceanic and Atmospheric Administration initiated the National Status and Trends (NS&T) Mussel Watch Program in 1986 to evaluate the environmental quality of U.S. estuarine and coastal waters. To date, the program has monitored spatial and temporal environmental contaminant patterns in bivalvees and sediments collected from over 200 sites along U.S. coasts. The program prescribes quality, standardized collection, preservation, and analytical protocols yielding data that are comparable throughout the monitoring period. The concentrations of selected contaminants, including trace metals, polychlorinated biphenyls (PCBs), organochlorine pesticides, polycyclic aromatic hydrocarbons (PAHs), and butyltins in oysters sampled from sites along the Gulf of Mexico have varied during the study period. Previous analyses of NS&T time series have suggested cyclical contaminant body burden patterns in oysters from the Gulf of Mexico for certain metals, PAHs, and pesticides. The El Nino/Southern Oscillation (ENSO) that significantly influences rainfall patterns in the Gulf of Mexico has been implicated as the driving force behind these cyclic patterns in contaminant body burden, as well as a number of biological health indicies, such as disease intensity. However, early 1990s variation in the length of El Nino/La Nina segments and a limited time series prevented a more detailed time series analysis. We apply wavelet analysis to the 1986-2003 time series to further investigate cyclical behavior in contaminant body burden in Gulf Coast oysters and the possible origin for this behavior in large-scale climate processes such as ENSO.
Key words: Contaminant, Oyster, El Nino/Souther Oscillation
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