BIO220H1 Lecture Notes - Lecture 20: Gross Domestic Product, Population Pyramid, Demographic Transition

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10 Jul 2014
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BIO220H1 Full Course Notes
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Instead of focusing on non-human factors in ecology, the last few lectures focus on social, political and ethical issues. The outline will be on carrying capacity of the earth and human impacts on a number of factors we will look at. A review from four years ago, will give the rate of growth in a population, dn/dt = rn. Exponential growth in humans cannot continue unchecked when one is looking at the maximum carrying capacity of humans. Recognizing allee from textbooks about allee effects and so-on, According to allee, human populations past the 1940s would begin to level off. Placing this on scales, about seven billion and climbing shows that human growth is exponential and non-logistical. Another is assuming growth to be a law of nature, rather than a simple model among many. Logistic doesn"t allow for overshoots and assumes intrinsic rate of increase and carrying capacity are constant over time. Many reasons one cannot model population growth very well.

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