Biology 2485B Lecture 7: The Human Population I
17 Sep 2018
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What is a population: population = individuals of the same species inhabiting a particular area. Size: current size of human population on earth - ~7. 6 billion, an equivalent number of ants would weigh ~ 23,000 kg. It (cid:449)ould take (cid:455)ou > 225 (cid:455)ears to sa(cid:455) (cid:858)hello(cid:859) to e(cid:448)er(cid:455) perso(cid:374) If we all joined hands, we could circle the equator 175 times. Density: 15 people/km2 (based on total surface of earth, 50 people/km2 (based on land surface only, human population density varies greatly. Spatial structure: the human population is clumped at multiple spatial scales, the broadest scale, you can see areas of lower and higher density, lower densities are areas with limited resources. Local scale: still a clumped distribution, a concentration of people where there are resources such as jobs and economy, urban planning and cultural factors at this scale, still clumped. Smaller group of pre-reproductive age group: top heavy.
