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2021-05-16

What is the term that describes the process of concentrations of a harmful substance increase in organisms at higher trophic levels in a food chain or food web?

What is the term that describes the process of concentrations of a harmful substance increase in organisms at higher trophic levels in a food chain or food web?

Biomagnification, also known as bioamplification or biological magnification, is the increasing concentration of a substance, such as a toxic chemical, in the tissues of tolerant organisms at successively higher levels in a food chain.

What is the increase in concentration of harmful substance in the body of organisms at each trophic level called and at what level is it maximum?

biomagnification

Why does the concentration of toxic substances increase from a lower to a higher trophic level?

Answer: Harmful chemicals are non-biodegradable in nature so they get accumulated inside the body of living organisms and when they move up in a food chain their concentration increases progressively as they cannot be excreted out from the body as they are insoluble or less soluble in water.

Which trophic level has the highest concentration of toxic substances and why?

Answer. Top Carnivore or we can say secondary consumer has the highest concentration of toxic substances in a food chain… eg. zooplankton < phytoplankton < Fish < Eagle (Birds).

Which trophic level has maximum concentration of harmful chemicals?

Peacock, Frog, Snake, Grasshopper. In this food chain, since peacock occurs at the highest trophic level (on the extreme right side), therefore, peacock will have the maximum concentration of harmful chemicals in its body.

Which trophic level has the most toxins?

Answer. the last trophic level of a food chain has the highest concentration of toxic substances.

Why is biomagnification dangerous?

In many cases, animals near the top of the food chain are most affected because of a process called biomagnification. This is biomagnification, and it means that higher-level predators-fish, birds, and marine mammals-build up greater and more dangerous amounts of toxic materials than animals lower on the food chain.

How can we prevent biomagnification?

Can toxic bioaccumulation be prevented?

  1. Do not put harmful substances (e.g., used motor oil) into the water system or storm drains.
  2. Avoid toxic chemical pesticides.
  3. Eat certified organic foods when possible.
  4. Avoid fishing or spending time in contaminated areas.
  5. Avoid plastics.
  6. Use cleaning products that are gentle on the environment.

Why is bioaccumulation happening?

Bioaccumulation occurs when toxins build up – or accumulate – in a food chain. At each trophic level of the food chain, the toxins remain in the tissues of the animals – so the concentration of toxin becomes most concentrated in the body tissues of the animals at the top of the food chain.

What is toxic offloading?

I found this to be very fascinating as I have heard several talks on toxic offloading and expected the opposite to occur. Toxic offloading is the process when a mother animal passes along toxins from its body to the developing offspring, thereby reducing its personal concentration levels.

Which trophic level is most affected by biomagnification?

Predators are usually at or near the top of their food web. This puts them at risk because the degree of biomagnification is high by the time it reaches their trophic level. Also, top predators usually consume large quantities of meat which has lots of fatty tissue and contaminants.

What chemicals can Biomagnify?

Some of the biomagnified chemicals are elements such as selenium, mercury, nickel, or organic derivatives such as methylmercury. Others are in the class of chemicals known as chlorinated hydrocarbons (or organo-chlorines).

How does DDT move through 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.