Rivers River Habitats Wetlands Aquatic Life Wildlife Habitats Stream Habitats Species Decline Population Decline Impact of Human Activity Wildlife Populations Land Ecosystems Threats to Biodiversity Aquatic Biodiversity Loch Ecosystems Andean Streams Lakes Cenotes Threats Lake Ecosystems Fish Populations Biodiversity Wildlife Conservation Chesapeake Bay Fish Species Habitat Restoration Lake Constance Biodiversity Monitoring River Basins Endangered Species Great Lakes Prehistoric Ecosystems Stream Ecology River Systems Saline Water Intrusion Species Adaptation Microbial Interactions Impact of Climate Change Dams