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.Know More
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 about Bodies of Water
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 >
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 >
Abiotic factors in a lake ecosystem include non-living components such as light, temperature, pH of the water and oxygen content. Biotic factors include living components of a lake such as bacteria, phytoplanktons, aquatic plants, zooplankton, crustaceans, molluscs, insects, fish and other vertebrates.Full Answer >
The five Great Lakes are Lake Michigan, Lake Huron, Lake Ontario, Lake Superior and Lake Erie. These interconnected bodies of water are located on U.S. and Canadian territory. They account for roughly 84 percent of the surface freshwater in North America, according to the Environmental Protection Agency.Full Answer >