ZOOLOGY 651 Lecture Notes - Lecture 15: Exponential Growth, Thomas Robert Malthus, Logistic Function
4 Nov 2016
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Document Summary
Population: unit of ecology and conservation simplest model: exponential model characteristics of population growth. Doubling time and half-life density-dependent population growth logistic growth dynamics allee effects. What predicts extinction? single best predictor population size study size and the factors that affect it. Why are rates of extinction going up faster than the human population? total human impacts depend on the product of 3 factors: population affluence - resources per capita technology - how much impact per dollar total global economy. Size smaller animals can generate a higher density in a smaller area reproduce quickly. Big animals take up more space reproduce slower. Big animals have low r low, any decrease can drop a population below the replacement rate high, can repopulate quickly. Nature of exponential growth all biological populations have the capacity to grow exponentially grows at a constant rate density independent real populations only grow this way for a brief period of time.
