Bio 100 chapter 13 - human population Lecture

Marking re capturing and estimating estimating

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Unformatted text preview: estimating Dispersion (how organisms are distributed in a space) is also important (3 types) space) 1. Clumped Distribution: high densities in high resources-rich areas, low densities elsewhere elsewhere Like humans on a global scale 2. Uniform Distribution is what humans show on a local scale Species showing uniform distribution are often territorial 3. Random Distribution occurs when no 3. compelling factor is bringing individuals together or pushing them apart together Seen in nonsocial species Historians have used archeological evidence Historians and written records to estimate the size of the human population for the last 10,000 years human Gives a pattern of growth for the human Gives population population This is a stark example of an exponential This growth pattern – the quantity of new offspring growth is an ever-growing number is J-shaped growth curve The larger the population is, the faster it grows 79 million people added each year Three people every second Quarter of a million every day Growth rate – percent change in population size in one year size Function of birth rate and death rate Faucet = new births new members added Water in bucket = population level Leaks = deaths In a population of 1000 people, if 22 babies In born born Birth rate is 22/1000 = 2.2% If 10 individuals die in same population Death rate is 10/1000 =...
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