Ontario Lake Chub (IMAGE) University of Toronto Caption An Ontario freshwater Lake Chub. Of all North American minnows, it is the one with the northernmost distribution. University of Toronto ecologists found its existence threatened by predators whose range of habitats are expanding northward due to climate change. (Photo: Don Jackson) Credit Don Jackson/University of Toronto Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.