GEOG 1HB3 Lecture Notes - Lecture 10: Birth Rate, Demographic Transition, Population Pyramid
20 Apr 2017
School
Department
Course
Professor
Document Summary
Globally population is understood with reference to two factors: fertility(births) and mortality (deaths) p1=p0 + (b-d) Regionally though, population is also influenced by population movement: Migration (immigration and emigration) p1=p0 + (b-d) + (i-e: crude birth rate (cbr): cbr= (b/p) x 1000. Total number of live births per year for every 1000 people already living. A) the number of women in the population, and. B) the number of women of child-bearing age (i. e. 15-49: general fertility rate (or fecundity) (gfr): gfr = (b/pf-15-49) x 1000, tfr: the average number of children a women will have in her fecund years (15-49) Global tfr = 2. 5 (2015); mdw =<2. 0 and ldw= 2. 0. Many factors influence the rates of fertility: age, nutritional well being, level of economic development, and culture. Population natural increase: high fertility with decreasing mortality means some areas have high natural increase, low fertility and low mortality means other areas are low-growth areas (or even in decline)
