food chain / food source / river systems / food web / important food source / chemical / aquatic food chain / food sources / mpact water intake systems / chemicals / food / /
NaturalFeature
Lake Erie / Great Lakes / Lake Michigan / Oceans Canada / Mississippi River / Lake Ontario / Pollution Probe Sea / /
Organization
U.S. Supreme Court / U.S. federal government / Government of Canada / Great Lakes Fishery Commission / Ontario Ministry of Natural Resources / Ontario Federation of Anglers and Hunters / Urge government / /
INVASIVE SPECIES Ecosystems and Non-native Species How did aliens become a part of the Great Lakes ecosystem? GREAT LAKES FACT SHEET