Ultra-oligotrophic; most oligotrophic of the Great Lakes. In shallow lakes, the oxygen may be depleted. Estimated ranges of water transparency values for various lakes. Except for benthic organisms that live on the lake or stream bottom, most aquatic organisms require some means to regulate their buoyancy so that they can remain suspended in the water. Significant changes in lake transparency are most often the result of human activities, usually in association with landuse:
The effect of ice and snow on reflection and transmission of light in lakes.
Food chains hooked together into a complex interconnected web. Water is a medium of extreme properties that strongly shape the nature of the organisms that can survive in it. Western arm near Duluth and St. However, the levels of light under water will vary according to many factors: Deepest plant growth m.