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Which term refers to the increasing concentration of toxins within each successive link in the food chain?
Stratification
Denitrification
Facilitation
Biomagnification
Biomagnification
Biomagnification is the process where the concentration of persistent, non-biodegradable toxins (like heavy metals or pesticides) increases as they move up the trophic levels. This occurs because organisms at higher levels consume large quantities of prey from lower levels, accumulating the toxins that the prey cannot excrete.
Biomagnification is the process where the concentration of persistent, non-biodegradable toxins (like heavy metals or pesticides) increases as they move up the trophic levels. This occurs because organisms at higher levels consume large quantities of prey from lower levels, accumulating the toxins that the prey cannot excrete.
Think of it like a snowball rolling down a hill; as it moves, it collects more and more snow, becoming much larger and denser by the time it reaches the bottom than it was at the top.
B-I-O (Build-up In Organisms)
Biomagnification┬аFactor=CpreyтАЛCpredatorтАЛтАЛ тАФ where C represents the concentration of the toxin.
The principle relies on the accumulation of fat-soluble chemicals that are resistant to metabolic breakdown. As energy transfer between trophic levels is inefficient (following the 10% law), a predator must consume a large biomass of prey, thereby ingesting the sum total of toxins stored in the tissues of all those prey organisms over time.
Toxins must be lipid-soluble to bioaccumulate in fatty tissues.
Toxins must be persistent and resistant to biological degradation.
Apex predators, such as humans or eagles, face the highest health risks due to this process.
Causes reproductive failure in birds (e.g., thinning eggshells from DDT).
Leads to neurological and developmental disorders in humans (e.g., Minamata disease from Mercury).
Accumulation of Mercury in tuna and swordfish.
Accumulation of DDT in bird of prey populations.
DDT was a primary driver for research into biomagnification during the mid-20th century.
Stratification refers to layering in forests or lakes, Denitrification is the conversion of nitrate to nitrogen gas by bacteria, and Facilitation is an ecological interaction where one species benefits another.
D is correct тАФ Biomagnification refers to the increasing concentration of non-biodegradable toxins at successive trophic levels in a food chain.
Do not confuse 'Bioaccumulation' (toxin increase in an individual over time) with 'Biomagnification' (toxin increase across the food chain).
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