The book titled "Diversity and Distribution of Phytoplankton Community Structure Vis a Vis Chlorophyll Pigments in True Estuarine Ecosystem" authored by A. Silambarasan presents a comprehensive study of phytoplankton diversity and community structure in estuarine ecosystems. The book explores the relationship between chlorophyll pigments and phytoplankton assemblages, and how they impact the ecological balance of estuarine systems. The author conducted an extensive survey of phytoplankton and chlorophyll pigments in three different estuaries, and the data collected was analyzed to evaluate the diversity, distribution, and abundance of phytoplankton species. The book highlights the significance of phytoplankton as a key component of aquatic ecosystems and their impact on the food chain. It also sheds light on the various factors affecting the distribution of phytoplankton, including temperature, salinity, and nutrient availability. The book also discusses the ecological implications of changing phytoplankton populations and the impact on the ecosystem and biodiversity. Overall, the book is a valuable resource for students, researchers, and environmentalists who are interested in understanding the dynamics of estuarine ecosystems and the role of phytoplankton in maintaining the ecological balance.