This factor tends to increase the population size as it increases the number of individuals in a certain area. Consequently, the birth rate is affected factors such as nutrition, fertility, attitudes about abortion, labor value of children, government policies, social value, and of the culture in the area. The second factor that affects the population size is the death rate, or the number of deaths in a year for a certain area. This factor affects the population size decreasing the number of individuals in the population.
This is affected by factors like disease, war, medical advancements and technology, health care, development of transportation, and of nutrition. The next factor is the immigration or the number of people moving into an area or a country. This factor is affected by other factors which are the characteristics of a place which tends to attract people to it. These are known as the pull factors. The last factor is the Emigration or the number of people leaving a country. This is also affected by the characteristics of an area that causes them to leave it, or the push factors.
In the case of the Nutria population, if the land is depleted, meaning all the resources have been consumed, it could greatly affect the rate of population decrease. This is because the necessities for the population to survive are all gone, so in order for them to survive, they have to leave and find a suitable place for them to get those resources. Some of them may die because of the lack of resources, and definitely some of them would go to other areas where they can get the necessary materials to sustain their lives.