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NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for this report were chosen for their special competences and with regard for appropriate balance.

This study was supported by a contract between the National Academies and the following entities: Contract No. 50-DGNA-1-90024 from the U.S. Environmental Protection Agency, Contract No. 50-DGNA-1-90024 from the National Oceanic and Atmospheric Administration, Cooperative Agreement No. 50181-2-J030 from the U.S. Fish and Wildlife Service, Grant from the National Fish and Wildlife Foundation, Grant from the Maryland Department of Natural Resources, Purchase Order No. D227024-4 from the Virginia Sea Grant, Grant No. NA070Z0136-01 from the Virginia Department of Environmental Quality, Grant No. SA7293808L.SA7528018F from the Maryland Sea Grant, and Purchase Order No. D227024-4 from the Connecticut Sea Grant. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the study.

This study was funded in part by a contract from the National Oceanic and Atmospheric Administration. The views expressed herein are those of the author(s) and do not necessarily reflect the views of NOAA or any of its sub agencies.

Library of Congress Catalog Number: 2003117095

International Standard Book Number: 0-309-09052-0 (Book)

International Standard Book Number: 0-309-52696-5 (PDF)

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