alien invasion sci wk 4

alien invasion sci wk 4 - 2 The factor that is affecting...

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Alien Invasion 1 Alien Invasion Jaclyn Russo SCI/275 18:00:42 Melissa Filiaggi The four factors that produce changes in population size are birth rate, death rate, immigration, and emigration. The first being birth rate which is the ratio between births and individuals in a specified population and time. The higher the birth rates of a species, the more likely the growth of the population. The second is the death rate or mortality rate and that means the ratio between deaths and individuals. The fewer of the population that die, the longer and more stable the population is likely to be. Immigration is the arrival of new settlers from surrounding areas. The last is emigration, members move away in search of somewhere else; this is the flip side of immigration.
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Alien Invasion
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Unformatted text preview: 2 The factor that is affecting the population size in the video is the birth rate. Since one nutria can have over forty babies every three years, and after the age of six months, the baby nutria can reproduce, these animals are having babies at a high rate, and they are becoming overpopulated (Berg, 2007). After the land is depleted of the nutrias’ food resources, the nutria will have to relocate to a different area in order to survive. They will have to keep moving because every area they inhabit will end up the same way; they will eat all of the available food resource and will eventually run out or they will die of starvation if they do not move on. Alien Invasion 3 References Berg, L. A. VISUALIZING ENVIRONMENTAL SCIENCE. Retrieved from Berg, L. A....
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This note was uploaded on 08/05/2011 for the course SCI 125 taught by Professor Basic during the Spring '10 term at University of Phoenix.

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alien invasion sci wk 4 - 2 The factor that is affecting...

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