Marine conservation ecology / John Roff and Mark Zacharias. Roff, J. C., 1942- Zacharias, Mark, 1967- Marine resources conservation. Marine ecosystem health. Marine ecology. GC1018 .R64 2011 577.7 22 ROM Includes bibliographical references and index. Washington, DC : Earthscan, 2011. 2011. 2011 Text xx, 439 p., [ 8 ] leaves of plates : eng