The scientific study of marine-life populations, habitat and interactions among organisms and the surrounding environment is known as marine ecology. It includes the study of their abiotic as well as biotic factors. Marine ecosystems are characterized by a high salt content. Marine ecology is involved in the study of the influence of geology, meteorology, geography, chemistry, physics and pedology of marine ecosystems. Some of the different types of marine ecosystems which are studied within this field are salt marshes, lagoons, mangroves, coral reefs and intertidal zones. It also studies the impact of human activities such as agriculture, medical research, fisheries and forestry on these ecosystems. This book explores all the important aspects of marine ecology in the present day scenario. It is a complete source of knowledge on the present status of this important field. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.