Greatly updated and expanded, this new edition of Biological Oceanography presents a current understanding of ocean ecology emphasizing the character of marine organisms from viruses to fish and worms, together with their significance to their habitats and to each other. Throughout, the book has been revised to account for recent advances in this rapidly changing field with a new chapter added reviewing approaches to pelagic food webs. Essential reading for senior undergraduate and graduate students of ocean ecology and professional marine ecologists.