This volume is concerned with many kinds of links between terrestrial and aquatic ecosystems. Ecological systems on land interact with water in many ways that have been treated throughout the Ecological Studies series. Volume l's chapters 16 through 18, on Hydrologic Cycles, provide background that leads directly into the description of nutrient-hydrologic interactions in Chap- ter 1 ofthe present volume. Volume 2 treats further aspects of water in forests, grassland, and crops. Volume 3 summarizes biological and environmental aspects of the whole Indian Ocean as a marine ecosystem that is...