This study was supported in part by grants R806079010 and CR 820667 from the United States Environmental Protection Agency and the US National Biological Survey cooperative agreement 14-16-0009-89-963. This chapter is the product of a workshop at the University of Southwestern Louisiana in Lafayette, supported by the Scientific Committee on Oceanographic Research. The authors gratefully acknowledge the diligent collaboration of Victor Rivera-Monroy, Ronghua Chen and Alfred Holmes. Claudia Munoz provided invaluable assistance in editing the manuscript and preparing illustrations for final preparation.
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