GEOG 106 Lecture Notes - Lecture 7: Demographic Transition, Logistic Function, Doubling Time
Document Summary
Biotic potential ability of a population to increase under ideal environmental conditions. The period of time required for a quantity to double in size or value. Rule of 70: doubling time is equal to 70 divided by the percentage. A population that is increasing at an increasing rate without any checks is called. Changes in human fertility and mortality associated with economic development and modernization. Early expanding: falling death rates, high birth rates. Late expanding: low death rates, falling birth rate. Low stable: low birth rates and low death rates. Post-industrial: low birth rates and low death rates, loss of population. Tendency of population to continue to grow or shrink despite changes in birth patterns because of the effects of previous population. A population continues to grow even though birth rates have dropped. Food needs are a function of population size, age, structure, and income. Food demand is projected to grow 2. 7%/year partly as a consequence of increasing income.
