생태학 관련 문제 (영어)

목차

1. How does the behavior of the logistic model differ from that of the geometric and exponential models in the previous exercise?
2. Why does the population stabilize at the carrying capacity?
3. How do DNt and DNt/Nt, or dN/dt and (dN/dt)/N, change as the population grows? How does the behavior of these quantities differ from the geometric and exponential models?
4. What is the y-intercept of the DNt/Nt line in the graph of DNt/Nt against Nt? What is the x-intercept? If you used the continuous-time version, ask the same questions about the (dN/dt)/N line. Answering this question will lead you to a powerful tool for analyzing real populations for density - dependence, and for estimating R (or r) and K.
5. What happens if the population overshoots its carrying capacity? This might happen, for example, if resources decreased dramatically from one year to the next, causing the carrying capacity to decrease. If population were at its old carrying capacity, it would suddenly find itself above its new carrying capacity. What would happen?
11. Has the human population grown exponentially or logistically since 1963? Can you estimate r and K for the human population? Estimating K is especially important because it amounts to a prediction of the size of our population when (and if) it stabilizes. Estimating r will allow you to predict when the population may stabilize.

본문내용

1. How does the behavior of the logistic model differ from that of the geometric and exponential models in the previous exercise?
- geometric과 exponential model이 population size는 계속해서 증가하지만 logistic model은 더 이상 증가하지 않는 부분을 갖는다는 점이 다르다.

2. Why does the population stabilize at the carrying capacity?
- 환경조건이 항상 일정하지 않으며 resources가 한정되어 있다. 이러한 점은 population이 계속적으로 증가하지 못하는 이유가 된다. 한정된 자원 때문에 밀도가 증가하게 되면 경쟁률이 증가하게 되고 이는 사망률의 증가를 초래한다. 결국 자손의 수는 감소하게 된다.

참고 자료

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