Population Size - fur-bearer. By the 1980’s, the...

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RUNNING HEAD: POPULATION SIZE 1 Population Size Chris Bolte SCI/275 June 17, 2011 David Barraza
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POPULATION SIZE 2 The four factors that produce changes in population size are birth rates, death rates, immigration, and emigration. If an organism in a given population is born faster than it dies, then the population size increases, and if the organism dies faster than it is born, then the population size decreases. Immigration is when individuals enter a population and increase its size, and emigration is the opposite; when individuals leave a population and decrease its size. In the video, the population size is greatly affected by both immigration and birth rate. First, the nutria were brought to Louisiana from South America during the 1930’s as a potential
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Unformatted text preview: fur-bearer. By the 1980’s, the population exploded due to an exceptional birth rate. Nutria are said to breed like rabbits, and are capable of mating during any month of the year (Krause, 2005). Once the land is depleted of the nutria’s food source in the Louisiana wet lands, it is most likely that the large rodents will move on to other food resources, possibly in other southern states with adequate wet lands. In addition, it is very possible that the nutria, with their lightning-fast breeding habits, can increase their population significantly by spreading across southern wet lands. POPULATION SIZE 3 References Krause, T. (2005). Nutria. National Trappers Association. Retrieved from http://www.nationaltrappers.com/nutria.html...
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Population Size - fur-bearer. By the 1980’s, the...

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