Date: 20 Mar 2007

Pesticide Body Residues of Hyalella azteca Exposed to Mississippi Delta Sediments

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Mississippi Delta portions of the Lower Mississippi Alluvial Plain are among the most intensively cultivated regions in the United States. The Delta has a long growing season and an average annual rainfall of approximately 130 cm, allowing weed and insect pests to flourish and requiring significant use of pesticides to control infestations and subsequent crop loss. Because of the widespread but controlled use of pesticides, the potential exists for low-level runoff into receiving watersheds (Snipes et al., 2004). Although surface water pesticide loads are often below effects concentrations, watershed sediments, acting as sinks, can accumulate these materials, potentially exposing benthic, epibenthic, and even aquatic organisms should sediments become resuspended in the water column (Cooper et al., 2003). In determining sediment quality, it is important to assess direct effects of contaminated sediments on organisms. However, there is also a need to assess potential indirect effects suc ...