sexta-feira, 28 de novembro de 2008

Endangered Species

Causes of Endangerment:


- Habitat Destruction:

Our planet is constantly changing, causing habitats to be altered and modified.
Natural changes tend to occur at a gradual pace, usually causing only a slight impact on individual species. However, when changes occur at a fast pace, there is little or no time for individual species to react and adjust to new circumstances. This can create disastrous results, and for this reason, rapid habitat loss is the primary cause of species endangerment. The strongest forces in rapid habitat loss are human beings.






- Introduction of Exotic Species:

Native species are those plants and animals that belong to a specific geographic area, and have been a part of that particular biological landscape for a long period of time. They are well adapted to their local environment and are accustomed to the presence of other native species with the same general habitat. These species are introduced into new environments by way of human activities, either intentionally or accidentally. This sudden change will lead to the contraction of some diseases that will endanger these species.







- Overexplotation:

The species that face the overexplotation may become severely endangered or even extinct due to the rate in which the species is being used. The overexplotation consists in killing animals to get some parts of their bodies, such as rhino horns or tiger bones, to sell, make clothes or traditional medicines.






- Other Factors:

Diseases, pollution, and limited distribution are other factors that threat many kind plants and animal species. If a specie does not have the natural genetic protection against particular pathogens, an introduced disease can have severe effects on that specie.




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