Why are pollutants like DDT found at toxic levels in pelicans but not the organisms lower than them on the food chain quizlet?

Why? DDT is absorbed in the fat of animals. Since fish eat lots of insects, DDT moves into their tissues. Since a pelican eats a lot of fish, more DDT builds up in its tissues and is trapped in its body.
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What animal has the highest level of DDT in its tissues?

The highest amount of DDT and derivatives residues were found in carnivore fish species, C. striatus which is the top predator of food web.
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Is the amount of DDT at each level in this model accurate compared to the real world?

This lab is not accurate compared to the "real world". In the "real world", there isn't as much DDT to begin with. In the lab, our DDT was around 0.8 for each phytoplankton while in the "real world" it is around 0.4.
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How did DDT become accepted and popularized without knowing whether it was safe quizlet?

Why did the public accept and popularize DDT without knowing whether it was safe? -DDT was first used in World War II to combat typhus fever, which is carried by insects, in U.S. soldiers. -DDT was successfully used by public health officials to combat illnesses such as malaria, which is carried by mosquitoes.
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Which level of the food chain is most affected by biomagnification quizlet?

In many cases, animals near the top of the food chain are most affected because of a process called biomagnification. Many of the most dangerous toxins settle to the seafloor and then are taken in by organisms that live or feed on bottom sediments.
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Biomagnification and the Trouble with Toxins



Why does DDT magnify within food chains when certain other chemicals do not?

Explanation: DDT increases or biomagnifies if we look at a food chain. DDT is fat-soluble, meaning animals store it in fatty tissues. It also takes a relatively long amount of time to break down.
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How does DDT affect the food chain?

When an animal consumes food having DDT residue, the DDT accumulates in the tissue of the animal by a process called bioaccumulation. The higher an animal is on the food chain (e.g. tertiary consumer such as seals), the greater the concentration of DDT in their body as a result of a process called biomagnification.
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Why are insecticides such as DDT used in developing countries despite being banned in many developed countries?

Why are insecticides (such as DDT) used in developing countries despite being banned in many developed countries? They are used because the benefits to human health are believed to outweigh the environmental costs.
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What is DDT and why was it banned?

Dichlorodiphenyltrichloroethane (DDT) is an insecticide used in agriculture. The United States banned the use of DDT in 1972. Some countries outside the United States still use DDT to control of mosquitoes that spread malaria.
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What is the negative effect that DDT has on birds quizlet?

What is the negative effect that DDT has on birds? Softens the bird's eggshells, making the eggs crack when the bird sits on them.
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What is the relationship between the trophic level and the amount of DDT found in the body of these organisms?

The higher the trophic level of an organism, the higher the concentration of DDT. DDT is excreted from the body very slowly and it is stored in fat. Thus, when an organism consumes another organism, the DDT in the prey accumulates in the predator.
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Why does the concentration of toxic substances increase from a lower to a higher trophic level?

As the trophic level increases in a food chain, the amount of toxic build up increases. The x's represent the amount of toxic build up accumulating as the trophic level increases. Toxins build up in organism's fat and tissue. Predators accumulate higher toxins than prey.
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What happens to the concentration of DDT in each trophic level?

Solution : DDT concentration continuously increases in successive trophic levels in a food chain. This phenomenon is known as biological magnification or biological amplification.
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What happens to pelicans when they have a high level of DDT in their bodies?

Since a pelican eats a lot of fish, more DDT builds up in its tissues and is trapped in its body. What happens to pelicans when they have a high level of DDT in their bodies? The pelican's eggs break very easily, and they are unable to reproduce.
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What is the impact of DDT on birds and other higher trophic level organisms?

Rather, DDT and its relatives alter the bird's calcium metabolism in a way that results in thin eggshells. Instead of eggs, heavily DDT-infested Brown Pelicans and Bald Eagles tend to find omelets in their nests, since the eggshells are unable to support the weight of the incubating bird.
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Which is likely to have the highest level of DDT deposition in its body?

Among the given animals, seagull which is a fish-eating bird and is present at a higher trophic level will have high levels of DDT deposition in its body.
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Why is DDT toxic?

Human health effects from DDT at low environmental doses are unknown. Following exposure to high doses, human symptoms can include vomiting, tremors or shakiness, and seizures. Laboratory animal studies showed effects on the liver and reproduction. DDT is considered a possible human carcinogen.
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Why is DDT bad for the environment?

DDT is very insoluble in water and very persistent in the environment, making it a highly polluting hazard. It's half life has been reported to be between 2 and 15 years.
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Why is DDT banned in most countries?

In 1972, EPA issued a cancellation order for DDT based on its adverse environmental effects, such as those to wildlife, as well as its potential human health risks. Since then, studies have continued, and a relationship between DDT exposure and reproductive effects in humans is suspected, based on studies in animals.
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Why DDT should not be banned?

Recent research has shown why. It has been found that DDT is “highly effective at repelling mosquitoes that are resistant to it”. Thus DDT not only kills mosquitoes not resistant to it but also repels mosquitoes which are resistant.
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Why did the United States ban the use of DDT quizlet?

Due to concerns about the possible adverse effects upon the health of humans and wildlife, application of DDT was prohibited in 1972 in the U.S.
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Why did the United States ban the use of DDT Brainly?

In the spring of 1972, Ruckelshaus banned DDT for pest control in the United States because of its persistence in the environment and carcinogenic properties.
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How has DDT caused decline in bird population?

DDT is resistant to metabolism by living beings and hence tends to accumulated. The presence of DDT in a bird's body leads to thinning of eggshells leading to death of the chicks before hatching. This explains the declining population of birds because of DDT.
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What animals does DDT affect?

DDT has been suggested to be toxic to a range of wildlife including birds and marine animals, and its metabolite DDE (dichlorodiphenyldichloroethylene) causes eggshell thinning of certain bird species such as bald eagle and brown pelican, leading to declines of their populations (1,2).
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What effect did DDT have on birds specifically Raptors?

Chemicals like DDT interfered with the reproductive cycle of raptors. The poison built up in the falcons' bodies as they ate birds that, in turn, had eaten insects and plants contaminated with the chemicals. The result was diminished fertility, plus eggs with shells so thin, they broke under the parent's weight.
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