Altering Population Growt1

Altering Population Growt1 - economic reasons....

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Altering Population Growth Humans can remove or alter the constraints on population sizes, with both good and bad consequences. On the negative side, about 17% of the 1500 introduced insect species require the use of pesticides to control them. For example, African killer bees are expanding their population and migrating from northward from South America. These killer bees are much more agressive than the natives, and destroy native honeybee populations. On a positive note, human-induced population explosions can provide needed resources for growing human populations. Agriculture now produces more food per acre, allowing and sustaining increased human population size. Overkill is the shooting, trapping, or hunting of a species usually for sport or
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Unformatted text preview: economic reasons. Unfortunately, this cannot eliminate "pest" species like cockroaches and mice due to their large population sizes and capacity to reproduce more rapidly than we can eliminate them. However, many large animals have been eliminated or had their populations drastically reduced (such as tigers, elephants, and leopards). The death of one species or population can cause the decline or elimination of others, a process known as secondary extinction. Destruction of bamboo forests in China, the food for the giant panda, may cause the extinction of the panda. The extinction of the dodo bird has caused the Calviera tree to become unable to reproduce since the dodo ate the fruit and processed the seeds of that tree....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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