Biology 2485B Lecture Notes - Lecture 6: Exponential Growth
1 Feb 2018
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What is a population: population = individuals of the same species inhabiting a particular area. Characteristics of a population: size, current size of human population on earth: ~7. 6 billion (7,598,552,000, earth is 4 billion years old. It would take you > 225 years to say hello to every person. If we all joined hands, we could circle the equator 175 times: an equivalent number of ants would weigh ~23,000kg, density, 15 people/km2 (based on total surface of. Earth: 50 people/km2 (based on land surface only, human population density varies geographically, structure (spatial and age, spatial structure: the human population is clumped at multiple spatial scales, clustered populations, not random probably due to resource availability. Estimation of population density in on: clumped distribution, high concentration of people where there are resources. Canada vs. afghanistan: age populations vary between 2 places, canada: longer life expectancy, more even distribution across age classes, afghanistan: more younger people than old, age structure predicts population growth.
