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What Is Eutrophication In Biology

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Removal Of Surface Sediment

What Is Eutrophication | Agriculture | Biology | FuseSchool

A highly eutrophic lake can be restored by silt removal. This method is applied to small ecosystems with extensive care. Sediment has high nutrient concentration and many toxic elements especially trace metals. The exchange of sediments and water disrupts the restoration of the ecosystem. When the wastewater treatment process starts, the speed of these exchange processes increases. In most cases, phosphorus reacts with iron phosphate sulfide to produce iron sulfide through phosphorus release.

What Causes A Lake To Become An Eutrophic Lake

Natural causes : This occurs because of the natural process of aging of lakes during which, nutrition status of water system gradually increases and oligotrophic lake is converted into a eutrophic lake. Similarly, death of aquatic plants and animals also increases nitrate and phosphate content of water.

What Are The Causes And Stages Of Eutrophication Brainly

Eutrophication happens when waste water released from fertilizer factories and runoffs from agricultural fields bring unwanted nutrients into water bodies. Algae soon cover the entire surface of water and prevent sunlight from entering the water body, thus affecting other plants and aquatic animals.

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Progression And Mechanism Of Eutrophication

Eutrophication leads to excessive growth of algae and phytoplankton on the water surface. This growth happens due to the enrichment of a water body. This enrichment increases the overall nutrient concentration of the water. The nutrient which plays a major role in the process of eutrophication is phosphorus. This element is present in fertilizers because plants need phosphorus for growth. However, phosphorus not only increases the growth of plants but it also increases the growth of other green organisms like algae. When these organisms grow on the surface of water bodies they inhibit the sunlight from reaching the bottom of the water body. This leads to inhibition of photosynthesis in aquatic plants which produce oxygen as a by-product of photosynthesis. It is a learned fact that the majority of life is sustained on this planet due to oxygen. The marine animals utilize the oxygen which is produced by the marine plants. This dissolved oxygen is as essential for marine life as it is for terrestrial life. When the oxygen levels decrease marine animals start to die. The dead marine animals and plants are then decomposed by bacteria present in water. As we know that the process of decomposition also requires oxygen, the level of oxygen in water further decreases. This causes a condition which is termed as hypoxia. Decomposition further releases nutrients in the water which in turn favors the growth of algae present on the surface.

What Is Eutrophication Causes Effects And Control

Pin on Environmental Science
  • Use of fertilisers: Agricultural practices and the use of fertilisers in the soil contribute to the accumulation of nutrients. When these nutrients reach high concentration levels and the ground is no longer able to assimilate them, they are carried by rain into rivers and groundwater that flow into lakes or seas.
  • Example of fertiliser spreading on agricultural land

    • Discharge of waste water into water bodies: In various parts of the world, and particularly in developing countries, waste water is discharged directly into water bodies such as rivers, lakes and seas. The result of this is the release of a high quantity of nutrients which stimulates the disproportionate growth of algae. In industrialised countries, on the other hand, waste water can be illegally discharged directly into water bodies. When instead water is treated by means of water treatment plants before discharge into the environment, the treatments applied are not always such as to reduce the organic load, with the consequent accumulation of nutrients in the ecosystem.

    Example of discharge of waste water into a reservoirExample of silting of a reservoir Formation mechanismEutrophication process representation Effects Algal bloomFish mortalityControlBibliographical references

    • Arpa Umbria . Stato di qualità ambientale del laghi e analisi dei trend evolutivi. Documento Tecnico.
    • Fenomeni di inquinamento delle acque naturali:

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    What Are 4 Causes Of Eutrophication In Water

    Causes of Eutrophication

    • Fertilizers Eutrophication is predominantly caused by human actions due to their dependence on using nitrate and phosphate fertilizers.
    • Concentrated Animal Feeding Operations.
    • Direct Sewage Discharge and Industrial Waste into Water Bodies.
    • Aquiculture.

    Undesirable Effects Of Eutrophication:

    • It facilitates rapid growth of aquatic plants causing algal blood. Growth of algae on surface of water prevents penetration of light into deeper layer.
    • When aquatic life dies, microorganisms consume dissolved oxygen to oxidize their dead bodies. Loss of dissolved oxygen inhibits growth of aquatic organisms.
    • Loss of dissolved oxygen creates anaerobic conditions that facilitates anaerobic decomposition of remaining organic matters. Compounds such as H2S, CH4, NH3 etc generated during anaerobic decomposition creates odor and taste problem in water.
    • Over growth of algae and other plants causes clogging of water filters during water treatment process.

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    Too Much Of A Good Thing

    Natural eutrophication is usually a fairly slow and gradual process, occurring over a period of many centuries. It occurs naturally when for some reason, production and consumption within the lake do not cancel each other out and the lake slowly becomes overfertilized. While not rare in nature, it does not happen frequently or quickly. However, artificial or human-caused eutrophication has become so common that the word eutrophication by itself has come to mean a very harmful increase and acceleration of nutrients. It is as if something receives too much fertilizer or has too much of what is a good thing.

    Threatens The Survival Of Fish And Other Aquatic Life Forms

    Pollution – Eutrophication – GCSE Biology (9-1)

    When aquatic ecosystems experience increased nutrients, the phytoplankton and other photosynthetic plants grow explosively, commonly known as algal blooms.

    As an outcome, the algal blooms limit the amount of dissolved oxygen required for respiration by other animal and plant species in the water. Oxygen depletion happens when the algae/plant life dies and decomposes.

    When the dissolved oxygen reaches hypoxic levels, the animal and plant species under the water, such as shrimp, fish and other aquatic biota suffocate to death. In extreme cases, the anaerobic conditions encourage the growth of bacteria that produces toxins that are deadly to marine mammals and birds.

    The growth of phytoplankton also causes reduced light penetration into the lower depths of the water. This can bring about aquatic dead zones, loss of aquatic life, and it also lessens biodiversity.

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    Invasion Of New Species

    A limiting nutrient corresponding to a water body can be made abundant by the eutrophication process, leading to a shift in the species composition of the aquatic body and the ecosystem surrounding it.

    If a nitrogen deficient water body is suddenly enriched with it, many other competitive species might relocate to the water body and out-compete the original inhabitants of the ecosystem. One such example of a new species invading eutrophic conditions is the common carp, which has adapted to these conditions.

    Hot Spots And Remedial Measures

    With regard to eutrophication, hotspots may be those being hypernutrified, such as estuaries or those areas showing regular symptoms ofeutrophication, e.g. the Baltic Sea. Other good examples are the near absence of beaver dams in the USA today, and the absence of large natural wetlands as aresult of reclamation in many low-lying countries. In the past these natural obstacles as beaver dams and large wetlands favored the retention of nutrients resulting in lower more near natural loads of coastal systems. It is clear that restoration of river systems or the rehabilitation of the integrity of entire river systems in combination with the application of best possible techniques is the best remedial measure to implement, coupled with river basin and catchment management.

    Areas requiring attention include populated regions, agricultural lands, and low-energy areas , i.e. mainly the large estuarine systems as well as developing countries with no or hardly any wastewater treatment. Anthropogenic eutrophication must be addressed, especially further improvement of wastewater treatment and technical processes to reduce the emissions of nutrients and related compounds to the atmosphere.

    Ichiro Aoki, in, 2012

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    What Is Eutrophication Gcse Biology

    What is eutrophication GCSE biology? Eutrophication. Eutrophication is a type of water pollution caused by the addition of sewage or fertiliser. The sewage or fertiliser run-off increases the nitrate concentration of the water and has a negative effect on the aquatic ecosystem .

    What is eutrophication GCSE? A major problem with the use of fertilisers occurs when they are washed off the land by rainwater into rivers and lakes. This leaching causes an increase in the levels of minerals such as nitrate and phosphate in the water, a process called eutrophication . Eutrophication encourages the growth of algae.

    What is eutrophication biology? Eutrophication, the gradual increase in the concentration of phosphorus, nitrogen, and other plant nutrients in an aging aquatic ecosystem such as a lake. The productivity or fertility of such an ecosystem naturally increases as the amount of organic material that can be broken down into nutrients increases.

    What is eutrophication in biology for kids? eutrophication The process by which a body of water becomes full of nutrients, which stimulate the growth of plants and algae. When these organisms die, bacteria decompose them and use up the waters dissolved oxygen in the process. It is a primary ingredient in most plant fertilizers.

    Minimizing Nutrient Pollution By Agriculture

    What Is Eutrophication Biology for All FuseSchool on Vimeo

    There are many ways to help fix cultural eutrophication caused by agriculture. Safe farming practices is the number one way to fix the problem. Some safety precautions are:

  • Nutrient Management Techniques – Anyone using fertilizers should apply fertilizer in the correct amount, at the right time of year, with the right method and placement.
  • Year – Round Ground Cover – a cover crop will prevent periods of bare ground thus eliminating erosion and runoff of nutrients even after the growing season has occurred.
  • Planting Field Buffers – By planting trees, shrubs and grasses along the edges of fields to help catch the runoff and absorb some nutrients before the water makes it to a nearby water body.
  • Conservation Tillage – By reducing frequency and intensity of tilling the land will enhance the chance of nutrients absorbing into the ground.
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    Strengthening Laws And Regulations Against Non

    Strengthening laws and regulations against non-point water source pollution can substantially control eutrophication. According to EPA, non-point pollution presents the most serious challenge in the management of nutrient entry into water systems. Controlling nutrient sources, therefore, results in decreased eutrophication.

    Eutrophication: Undesirable Effects And Control Measures

    • Enrichment of water system with plant nutrients such as nitrate and phosphate is known as eutrophication.
    • The word eutrophication refers to nutrient rich condition of water system.
    • On the basis of nutrition status and productivity, water systems are classified as
    • Oligotrophic: water with poor nutrient content and poor productivity
    • Mesotrophic: water with moderate nutrient content and moderate productivity
    • Eutrophic: water with rich nutrient content and very high productivity
    • Nitrate and phosphate are key plant nutrient. Therefore, if nitrate and phosphate enter into natural water system, they facilitates heavy growth of aquatic plants like algae causing Algal bloom.
    • Waste water such as Sewage contains high concentration of nitrate and phosphate. Similarly, death of aquatic plants and animals also increases nitrate and phosphate content of water.
    • Nutrition status of water system such as lakes gradually increases with increase in age of lake as they gradually changes from oligotrophic to eutrophic water system.

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    Changes In Species Composition

    Eutrophication alters the composition and diversity of aquatic plants, affecting ecosystem structure and the food web . Increased inputs can shift algal composition in a freshwater lake from diatom-dominated systems, typical of oligotrophic lakes, to blue-green algae-dominated systems. Blue-green algae release toxins and are not readily ingested by secondary consumers. In addition many blue-green algae contain gas-filled vacuoles, causing the algae to float and accumulate on the water surface, effectively shading the lower waters and eliminating many important submerged plant species. Rotting masses of blue-green algae washed up on the shoreline of previously clear lakes is a discouraging sign that accelerated eutrophication has overtaken a lake’s ecosystem. In coastal marine estuaries and bays, eutrophication has been linked to harmful algal blooms often called red tides that cause widespread fatalities in fish and other marine organisms.

    Figure 5. Increasing nutrients in shallow marine systems can shift aquatic plant communities from sea-grass beds that provide valuable habitats for marine organisms to nuisance macroalgae that cover the sediment with mats of rotting biomass. Nutrient enrichment stimulates the growth of phytoplankton in the water column and attached algae on the sea grass, limiting light penetration below levels for sea-grass sustainability. Reproduced with permission from McComb AJ Eutrophic Shallow Estuaries and Lagoons. Boca Raton, FL: CRC Press.

    What Are The Steps Of Eutrophication

    Eutrophication and dead zones | Ecology | Khan Academy

    Eutrophication occurs in 4 simple steps:

    • EXCESS NUTRIENTS: First, farmers apply fertilizer to the soil.
    • ALGAE BLOOM: Next, the fertilizer rich in nitrate and phosphate spark the overgrowth of algae in water bodies.
    • OXYGEN DEPLETION: When algae forms, it blocks sunlight from entering water and uses up oxygen.

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    Algal Blooms And Oxygen Depletion

    As algae begin to form, it blocks sunlight from entering the bottom of ponds, lakes, and rivers. As more nutrients drain into the water, eutrophication repeats in a vicious algal bloom cycle and releases more nutrients in the water.

    When algae receive enough sunlight, they produce oxygen through photosynthesis and release it in the water. But without light, algae stop generating oxygen and consume it instead.

    When algae die, bacteria begin to decompose the remains, using up oxygen for respiration. Eventually, the decomposition causes the water to become depleted of oxygen. Over time, this causes the water to carry less oxygen than before.

    What Is Eutrophication In Biology Gcse


    Moreover, what is eutrophication in biology?

    Definition of eutrophication. : the process by which a body of water becomes enriched in dissolved nutrients that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen. Eutrophication Has Greek Roots Example Sentences Learn More about eutrophication.

    Also Know, which causes eutrophication? Eutrophication is predominantly caused by human action due to the dependence on using nitrate and phosphate fertilizers. Agricultural practices and the use of fertilizers on lawns, golf courses and other fields contribute to phosphate and nitrate nutrient accumulation.

    Similarly one may ask, what is GCSE leaching?

    GCSE Biology > Leaching / Eutrophication. Leaching describes the “washing out” from soils any soluble chemicals that are not “bound” to the soil particles. It occurs as excess rain waters drain through the soil.

    How does eutrophication happen step by step?

    Steps of Eutrophication

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    Eutrophications And Its Effects On Water Bodies

    Criteria are widely used to determine the trophic condition of a reservoir. The idea that trophic theory is multifaceted and involves a variety of parameters is shown in the table below.

    Table: Comparison of physical and biological properties of an oligotrophic and eutrophic lake


    The amount of green and bluish green algae

    Bacillariophyceac, e.g. Pinnularia, Cymbella Chlorophyceae, e.g. Volvox Chrysophyceae, e.g. Synura, Chromulina

    Cyanophyeae e.g. Microcystis, Nostoc

    Characteristics of the zooplankton group

    Presence of large sized species such as Daphnia, Cyclops

    Samll bodied species such as protozoans

    Characteristics of fish

    Different types of small-sized fin fish

    Different types of large sized fish

    The level of dissolved oxygen at the bottom


    Density of nutrients in water

    The concentration of nutrients in the sediment


    Can be noticed in most cases

    Algae and oxygen are produced as a result of eutrophication and assimilation of readily available nutrients. This is why aquatic macrophytes can form blooms. The oxygen produced in this way is used by algae blooms and dead plants. Bacteria oxidize large plant components in large quantities. As a result, there is a lack of oxygen in the water. This causes the death of fish and other aquatic organisms. The oxygen used during digestion is called biochemical oxygen demand. Non-living bacteria produce hydrogen sulfide and methane gas at the bottom which degrades the quality of water.

    Humans Increase The Rate Of Eutrophication

    synthesis of the evolution of the three phases of the

    Human activities almost always result in the creation of waste, and many of these waste products often contain nitrates and phosphates. Nitrates are a compound of nitrogen, and most are produced by bacteria. Phosphates are phosphorous compounds. Both nitrates and phosphates are absorbed by plants and are needed for growth. However, the human use of detergents and chemical fertilizers has greatly increased the amount of nitrates and phosphates that are washed into our lakes and ponds. When this occurs in a sufficient quantity, they act like fertilizer for plants and algae and speed up their rate of growth.

    Algae are a group of plantlike organisms that live in water and can make their own food through photosynthesis . When additional phosphates are added to a body of water, the plants begin to grow explosively and algae takes off or “blooms.” In the process, the plants and algae consume greater amounts of oxygen in the water, robbing fish and other species of necessary oxygen.

    All algae eventually die, and when they do, oxygen is required by bacteria in order for them to decompose or break down the dead algae. A cycle then begins in which more bacteria decompose more dead algae,

    consuming even more oxygen in the process. The bacteria then release more phosphates back into the water, which feed more algae. As levels of oxygen in the body of water become lower, species such as fish and mollusks literally suffocate to death.

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