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Draw a lake showing different zones. Why are they called so?

Last updated date: 17th Jun 2024
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Hint: They provide shelter for plants and animals that are marine and semi-aquatic. Green plants provide nourishment in which any single living amphibian is based. They would subsequently be named autotrophs.

Complete answer:
Three areas or sub-territories in lentic waters are generally isolated: littoral, limnetic, and benthic. A small lake can consist entirely of a coastal region. The lake consists of three areas.
1) Coastal zone: The region near the coast where sunlight penetrates into the sediments and enables aquatic plants to expand.
2) Limnetic region: A zone with an exposed field of water in which light does not penetrate to the bottom. It is a plankton and nekton zone.
3) Benthic zone: The lake's bottom is composed of coral reefs, scallops and mussels.

Lakes are categorized as follows based on productivity:
1) Oligotrophic lakes: Poor primary productivity and low biomass levels combined with low nitrogen and phosphorus concentrations (nutrients). They seem to be oxygen-saturated.
2) Mesotrophic lakes: Lakes in the transition from oligotrophic environments to eutrophic ones. During summer stratification, such oxygen saturation depression occurs in the hypolimnion.
3) Eutrophic lakes: These display elevated nitrogen concentrations, high productivity of biomass and low transparency. The concentration of oxygen in the hypolimnion can get very low during the season.
4) Hypereutrophic lakes: These are lakes with extremely high nitrogen concentrations at the maximum edge of eutrophication and related development of biomass. During season, anoxia or total oxygen deprivation occurs in the hypolimnion.
5) Dystrophic lakes: These are fertile organic lakes fed by the lake's external inputs.
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Note: For a certain group of species, Lake's productivity is the production rate, basically reflecting the net growth rate of organisms. Lakes rarely suffer from water scarcity, but because of the lack of nutrients needed for plant growth and reproduction, they are also unproductive.