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Biomagnification and accelerated eutrophication are both caused due to indiscriminate use of chemicals and irresponsible human activities. Do you agree? Support your answer with explanation and an example of each.
Answers (1)
Yes, biomagnifications and accelerated eutrophication are both caused due to indiscriminate use of chemicals and irresponsible human activities.
Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolized or excreted, and is thus passed on to the next higher trophic level.
Example: In the aquatic food chain the concentration of DDT increases at each trophic level. It starts at 0.003 ppb(parts per billion) in water and reaches up to 25 ppm in fish-eating birds which causes thinning of the eggshells, the premature breaking of eggshells and eventually causes a decline in the bird population.
Accelerated eutrophication is caused due to accumulation of industrial and domestic waste into water bodies.
Example- The prime contaminants are nitrates and phosphates, which act as plant nutrients. They overstimulate the growth of algae, causing unsightly scum and unpleasant odors, and robbing the water of dissolved oxygen vital to other aquatic life. At the same time, other pollutants flowing into a lake may poison whole populations of fish, whose decomposing remains further deplete the water’s dissolved oxygen content. In such fashion, a lake can literally choke to death.
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