Diverse aquatic biomes are represented in the U.S. Long- Term Ecological Research (LTER) network of 26 research sites (e.g., clockwise from upper right: Georgia Coastal Ecosystems [photo by Steven Pennings]; Arctic lakes, Moorea Coral Reef [photo by Gerick Bergsma], California Current Ecosystem [merged SeaWifs/MODIS-Aqua image from Mati Kahru]).