BIO220H1 Lecture Notes - Lecture 7: Population Momentum, Thomas Robert Malthus, Carrying Capacity

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13 Feb 2015
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BIO220H1 Full Course Notes
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BIO220H1 Full Course Notes
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Bio220, final 5 lectures: bio120 treated fundamental ecological processes in natural systems. To date in 220 its been a mixture: now we specifically focus on humans. Effects of humans on natural systems: transition from just another species to a unique force: numbers and technology, this topic necessarily goes beyond previous material in: Outline for remaining section: carrying capacity of the earth, human impact = function of population and consumption (affluence and technology) Throughout, purple font indicates review material from bio120. Historical perspective from first really successful ecology textbook: allee, emerson, park, Exponential growth cannot continue unchecked, so more complex models are needed: simplest model of density-dependent regulation is the logistic: dn dt rn. Sigmoid growth, asymptotic approach to carrying capacity (k) In mid-20th century, logistic model was viewed almost as an ecological law . So far, human population growth looks much more like exponential growth than logistic. Human projection from allee et al. in 1940"s.

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