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Essay / Research Paper Abstract
A 6 page research paper that addresses two aspects environmental crisis. The first half of the paper compares and contrast the terms “bioaccumulation” and “biological magnification,” defining and explaining each. The second half addresses the population control policies instituted by the governments of China and Mexico. Bibliography lists 3 sources, but one citation is incomplete.
Page Count:
6 pages (~225 words per page)
File: D0_khbiopop.rtf
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Unformatted sample text from the term paper:
is defined as "The increased concentration of toxic chemicals in the tissues of organisms that are at high levels in the food web" (Human...Toxicology 151). There are commercially used pesticides
that animals cannot metabolize, that is, break down and, furthermore, animals may also not be capable of cleansing their bodies through excretion of these substances (Human...Toxicology 151). When this
occurs, over time, the animal will store these toxins in fatty tissues. In other words the organism will "bioaccumulate or bioconcentrate" the pesticide, which results in "high concentration" over time
(Human...Toxicology 151). As a general rule, organisms that are higher on the food chain will have increased levels of bioaccumulation of toxins that those organisms that occupy lowers niches on
the food web (Human...Toxicology 151). In other words, animals higher in the food web eat substances or other animals who have ingested pesticides or other toxins, thus the amount
of toxic substances that an animals ingests tends to get higher as one proceeds higher into the food web. This rise in pesticide through the "successive levels of the food
web" is referred to as "biological magnification or biological amplification" (Human...Toxicology 151). For example, a Long Island salt marsh was sprayed with DDT over an extended period of time
in order to control for mosquitoes and algae and plankton absorbed the pesticide (Human...Toxicology 152). This was in turn absorbed by shrimp, which were eaten by American ells, which were
eaten in turn by Atlantic needlefish, which were eaten in turn by ring-tailed gulls (Human...Toxicology 152). The original concentration of DDT in the water was extremely diluted, just 0.00005 parts
per million (ppm); however, this concentration increases considerably proceeding just one step up in the food web, as algae and other plankton in the salt marsh exhibit a DDT concentration
...