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Lecture 21: "Population Ecology II"

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Biology 1001A
Susanne Kohalmi

Biology Lecture No. 22: Community Ecology st Monday, November 21 , 2011 Human Population Growth: -Human population size (worldwide) is still increasing because we have succeeded in increasing our carrying capacity. Human Populations Vary In R: -E.g. while some continents are projected to increase in population size, some are projected to decrease, or stay the same. “R” Reflects Age Structures: -E.g. growth rate in United States is zero; growth rate in Mexico is rapid; all due to age structure. Increasing “N” (Population), But Decreasing “R” (Growth Rate): -Globally, r = 0.011 or 1.1 % (per person per year) -Population sizes won’t decrease until r becomes negative. Demographic Transition Model: -Over time, human societies get wealthier and throughout the industrial age, human birth rates and death rates are subject to tremendous variation. Population Size Isn’t Everything: -The interactions within a population and between other populations are sometimes more significant than population size. Community Ecology: -Community: A set of assemblage of populations that interact with each other. Why Are Populations Distributed The Way They Are? : -Some species are limited by a single critical factor (e.g. temperature, water abundance, daylight, etc.) -Many species have multidimensional toler
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