Appropriate for undergraduate majors and graduate students in marine biology and ecology, Marine Biology: An Ecological Approach emphasizes the ecological principles that govern marine life throughout all environments within the world's oceans. Its unique ecological approach adds real-world relevance by exploring how organisms interact within their individual ecosystems. The text is organized by habitat, not function, with each habitat receiving detailed, in-depth coverage that gives instructors flexibility to focus on their particular areas of interest. The Fifth Edition is fully updated with the latest research data and topics, including expanded coverage of the human impact on oceans, oceanic dead zones, and coral reefs. Additional new material includes discussion of plate tectonics and continental drift, migration differences in male and female elephant seals, and seasonality or lack thereof in reproduction. The Fifth Edition of the text also offers enhanced pedagogy with new end-of-chapter summaries, a new full-color design, an art CD-ROM for instructors, and a text specific Companion Website.