The book "Acidic Deposition and Aquatic Ecosystems" offers a comprehensive analysis of the effects of acidic deposition on aquatic ecosystems. Since the 1970s, acid deposition has been a central topic in scientific research and public policy in the United States. This work represents the first integrated synthesis of the available information on the current and potential effects of acidic deposition on lakes and streams in regions with low-alkalinity surface waters. The authors, leading experts in their field, examine water chemistry and the processes that influence it on a regional basis, utilizing high-quality datasets. Additionally, methods for assessing long-term changes in water chemistry and their impacts on fish and other organisms are presented. The book highlights the diversity of surface waters in various geographical regions and sheds light on the complexity of their responses to acidic deposition. It is aimed at researchers in the fields of limnology, aquatic ecology, environmental chemistry, hydrology, and atmospheric sciences, as well as environmental managers and policymakers.