Encyclopedic Entry Vocabulary A lake is a body of water that is surrounded by land.
Lake ecosystem diagram
The pH level is a chemical property of all substances. It is possible for populations of algae in lakes to exhibit a succession of species during the course of one year. Sewage always contains a higher concentration of phosphates than nitrogen due to increased use of phosphate containing detergents. The toxic water can kill animals and make humans sick. The hypolimnion is the warmest. Other vertebrate taxa inhabit lentic systems as well. The visible result of these rotations, which can be seen in any lake, are the surface foamlines that run parallel to the wind direction. There are many lakes today in the United States, Canada, and parts of Europe dead or drying up because of acid rain. Seasonal variations in flagellate and ciliate abundance are variable. Bacteria that use up the oxygen in the water first decompose raw sewage. Blue-green algae, also called cyanobacteria , is not a part of the food web. In response, some species, especially Daphnia sp.
Sometimes the top of a volcano is blown off or collapse s during an eruptionleaving a depression called a caldera. Lakes vary greatly in size.
Deepwater fauna is very dependant on the production in the euphotic zone. These species are likely from other regions and only come to these depths to feed.
Lake ecosystem zones
Biological communities within lakes may be organised conceptually into food chains and food web. These faults make natural basins that may fill with water from rainfall or from streams flowing in the basin. Non-native plants and animals are almost always introduced by people. Melack Density Stratification and Stability, B. It is caused by toxic gases from factories, coal-fired power plants, vehicle exhaust , and home furnace s. Rinsing boats, equipment, and even people can help reduce the transfer of harmful species. The hypolimnion, however, circulates very slowly and has no atmospheric contact. Efficiency of carbon transfer within lake ecosystems is dependant on two factors: a quantity of biomass created at primary producer level and b composition of species, which determines efficiency of grazing and quality and quantity of fish representing the highest trophic level in the system. A fish might also alter its residence during different parts of its life history: hatching in a sediment nest, then moving to the weedy benthic zone to develop in a protected environment with food resources, and finally into the pelagic zone as an adult. Changes, which occur in the lake due to addition of nutrients on account of human activities , are called as eutrophication. Eutrophication is when a lake gets too many nutrients, causing blue-green algae growth. Methylmercury , a toxic form of mercury, has been linked to acid rain. Its middle layer is the metalimnion , or thermocline. The lowest lake is the Dead Sea, between Israel and Jordan.
The warm, shallow water of the upper layer of the lake causes plants and algae to decomposeand eventually they sink to the basin. Because the articles are drawn from an encyclopedia, the articles are easily accessible to interested members of the public, such as conservationists and environmental decision makers.
Dystrophic lakes: These are organic rich lakes humic and fulvic acids fed by external inputs of the lake watershed.
Detritus consists non-living organic matter in both dissolved and particulate forms. Peters, D. This helps people in the fishing industry identify what kinds of fish they might be able to catch in that lake.
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