The bioaccumulation of pesticides in birds leads to
Answers
Answer:
Explanation:
For every 10 pounds of food an animal consumes, roughly one pound can become body mass, increasing toxin concentrations nearly 10 times at each food-chain level. Thus, a biomagnified toxin potentially becomes most harmful to top predators, including humans who eat meat or fish. While bioaccumulators are stored in fat, they are released into the bloodstream when an animal uses body fat for energy, harming vital organs and systems. They are also released from breast tissue in milk production and consumed by nursing offspring. If bioaccumulators destroy keystone species in an ecosystem, such as predators that control prey populations, it can lead to the loss or extinction of many species. PCBs, PAHs, heavy metals, some pesticides and cyanide are all bioaccumulators.During an oil spill, hydrocarbons called polycyclic aromatic hydrocarbons (PAHs) can accumulate in sea animals. PAHs have been linked to cancer in humans that eat fish and shellfish and adversely affect survival, growth and ability to fight disease in other organisms. Eating contaminated mollusks poses special risks because they are more likely to come in contact with spilled oil and have a high tendency to bioaccumulate PAHs. In addition, in the 1960s, scientists discovered that an overused chlorinated hydrocarbon pesticide, DDT, accumulated in soil, water and organisms. It affected predatory birds, including fish-eating bald eagles, by thinning their egg shells, leading to a drop in their populations.
Answer:
Bioaccumulation is the gradual accumulation of substances, such as pesticides, or other chemicals in an organism. This occurs when the absorption of pesticides is faster than its excretion.
Adverse effects of bioaccumulation include accumulation of mercury in the brain causes mercury poisoning, DDT, tetraethyllead kills organisms and the accumulation of pesticides in birds causes egg-shell thinning.
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