Oligotrophic lakes are those bodies of water that have a poor nutrient supply and little to no plant life while eutrophic lakes have a good nutrient supply and support high plant growth. The root word "trophic" means nutrition or growth, and remembering that is an easy way of remembering the basic concept indicated by the words oligotrophic and eutrophic. A combination of different factors can lead to a lake being either oligotrophic or eutrophic, including human land management and use, the water's natural temperature and the lake's size, including shape, depth and volume.
Oligotrophic and eutrophic lakes can be described in terms of productivity, in which an oligotrophic lake, thanks to its low nutrient level and generally inhospitable environment for life, is said to be less productive while the more life-sustaining eutrophic lake type is said to be more productive.
In general, lakes can progress from being oligotrophic when they are first formed to being eutrophic as they mature and gain the qualities of a life-sustaining ecosystem. For example, a lake that forms in a land depression caused by a receding glacier may start out with very little life and nutrients, but microorganisms that are able to gain a foothold there begin digesting and composting organic material, making for a more fertile nutrient base that beings to sustain more plant life.Learn More
The bodies of water around France include the Mediterranean Sea, the North Sea, the Atlantic Ocean, the Rhine River and the English Channel. France also borders countries such as Germany, Italy and Switzerland.Full Answer >
Examples of producers in lakes and ponds include algae, phytoplankton, starwort, spiked water milfoi, great willowherb, water lilies, native grasses and wildflowers. Aquatic plants come in three varieties: those that grow completely underwater, those that float on water and those that root underwater but reach above the water's surface.Full Answer >
Major lakes in Tennessee include Kentucky Lake, Lake Barkley, Norris Lake, Pickwick Lake, Watts Bar Lake, Old Hickory Lake, Cherokee Lake and Chickamauga Lake. The largest of these bodies of water, by far, is Kentucky Lake, which covers 160,000 acres in western Tennessee. Lake Barkley is the second-largest body of water in Tennessee, and it is located east of Kentucky Lake.Full Answer >
Lakes form due to receding glaciers, plate tectonics, volcanism, meandering rivers, landslides and human damming. Most of the natural lakes in North America formed due to glaciers receding from the last ice age 18,000 years ago. Crater Lake in Oregon formed because of a volcano, when its cone on top collapsed. An oxbow lake is created after a river swells due to excess rain and then waters recede.Full Answer >