Marine Biology: An Ecological Approach emphasizes the ecological principles that guide marine life throughout all environments within the world's oceans. It provide a unique ecological approach that helps students understand the real-world relevance of marine biology by exploring how organisms interact within their individual ecosystems. The text is organized by habitat, not classification, with each habitat receiving detailed, in-depth coverage that draws students into the subject matter. These include new coverage of the intertidal zone, salt marshes and estuaries, and tropical communities, as well as a revised discussion of humans' impact on the sea. Marine Biology emphasizes the ecological principles governing marine life throughout all environments within the world's oceans. This unique ecological approach adds real-world relevance by exploring how organisms interact within their individual ecosystems. The text is organized by habitat, each receiving detailed, in-depth coverage which gives instructors flexibility to focus on their particular areas of interest. Marine Biology: An Ecosystem Approach explores the potential use of bivalves as indicators and monitors of ecosystem health and describes experiments from the perspective of computer simulations, mesocosm studies, and field manipulation experiments.