BIOL1003 Lecture 27: Lecture 27 BIOL - Human Populations
9 Aug 2018
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Document Summary
Factors affecting rates of increase and decrease. Characteristics of current human population: population growth rates per 1000 persons. Growth rate of population is determined by looking at birth/death. Population growth = (birth + immigration) (deaths + emigration) Key feature for predictions and planning is the time it takes for a population to double. Doubling time = demographic constant (70) / growth rate = 70 / Population growth varies between countries: qatar 10. 10, niger 3. 86, germany -0. 18, key events for human population. Resources food/water, shelter and food gatherers: early humans lived in small populations (nomadic hunters, agriculture adopted approximately 10, 000 years ago. Provided a rich new form of food source. An explosion of the population: crops could also be stored for when food was scarce, this allowed permanent villages to be established, agriculture changed the social organisation. Health: historically disease has been an important control, especially once towns and cities developed e. g. cholera,
