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Identify 3 density dependent factors that limit population size and explain how each...

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taylers | Student, Undergraduate | (Level 1) eNoter

Posted August 3, 2010 at 10:31 PM via web

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Identify 3 density dependent factors that limit population size and explain how each exerts negative feed back?

How does a human populations; age structure affect its growth rate?

These are both on my AP biology summer assignment. They are listed under chapter 53: Population Ecology.

I really need some help.

:)

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tyren4 | Student, Grade 10 | (Level 1) eNoter

Posted September 29, 2010 at 8:00 AM (Answer #1)

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Density-dependent factors are factors such as disease, parasites, or food supply that has an increasing effect as populations increase.

Density-independent factors are factors such as temperature, storms, floods, drought, or habitat disruption that affects all populations, regardless of their density. hope this helps :D

 

The factors affecting global human population are very simple. They are fertility, mortality, initial population, and time. The current growth rate of ~1.3% per year is smaller than the peak which occurred a few decades ago (~2.1% per year in 1965-1970), but since this rate acts on a much larger population base, the absolute number of new people per year (~90 million) is at an all time high. The stabilization of population will require a reduction in fertility globally. In the most optimistic view, this will take some time.

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