Negative Impact of Animals

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Parasitism is a dangerous problem that causes diseases in animals. Over time, the most successful parasites are the protozoa, the helminthes, and some of the arthropods (Olsen 1962). These parasites were successful because they move from one host to the next, and some of these parasites, such as the arthropods, feed on blood and tissues in animals and humans, and deprive nutrients from their host. Often this loss of nutrients will result in severe internal organ bleeding for the host. For example, “When parasites, such as hookworms in man or trichostrongyles in cattle and sheep, affect the entire population, the effect of the disease is masked and often not recognized…the injections of these parasites results in great loss of blood through bleeding into the intestine.” Moreover, parasites infect their host leaving an escape route for bacteria and diseases to spread. These diseases can be contagious to humans, therefore animals harm the ecosystem by spreading bacteria and pathogens. According to Baucom and de Roode (2011), tolerance or resistant mechanisms in animals can reduce the growth of parasites. Diseases and bacteria are not the only problems with animals. As the human population increases, animals and humans come in conflict with one another because space and food are limited. To prevent overcrowding, many species are aggressive and developed mechanism to defend their available habitats (Golley 1962). Animals can create major problems because they spread diseases to humans and threatened their lifestyle. To begin with, animals bring harms to humans by transmitting diseases and bacteria. Diseases mainly come from bacteria and harmful parasites. Though some parasites are beneficial to their hosts, many others ... ... middle of paper ... ...m humans’ occupations. Whereas, humans built many projects and homes to shelter these animals and they also created restricted spaces that separates them from the animals, in order for the animals to live within their habitat without interfering with the human populations. Finally, if animals have no boundaries, they can be an intimidating creature. Works Cited Baucom, R. & de Roode, J. (2011). Ecological immunology and tolerance in plants and animals. Functional Ecology, 25(1), 18- 28. Castleberry, S. (2005). Mammals. Georgia encyclopedia. Retrieved March 19, 2011, from http://www.georgiaencyclopedia.org Golley, F.B. (1962).Mammals of Georgia: a study of their distribution and functional role in the ecosystem. Athens: University of Georgia Press. Olsen, O. W. (1962). Animal parasites; their biology and life cycles. Minneapolis: Burgess Pub. Co.

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