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Lecture

bio434 lec 3.docx


Department
Biology
Course Code
BIO434H5
Professor
Maria Arts

Page:
of 6
02/22/2014
Lecture 3
Focus and concerns
Populations:
-the # composition distribution of people in relation to variations in conditions across the globe
-unequal distribution of pop
-significant variation in pop dynamics(birth rate, death rate , growth rate)
-concern of disconnect populations and resources
Population dynamics: births
Crude Birth Rate (CBR):
# of live births(LB) in one year multiplied by the total population (TP) divided by 1000[ LB/ TP *1000 =CBR]
Some geographic patterns that influence birth rate are:
Economic structure
Social structure
Cost of children
Role of women in society
Population dynamic death:
# of of death (ND) in one year divided by the total populations(TP) multiplied by 1000s
[ND/TP*1000=CDR]
Geographic patterns that influence death rate:
Economic structure:
Influence food supply,water,medical facilities
Social structure:
Welfare,role of women
Cause of death :
Geographical variations
Structure of populations:
Proportions of young/old in population
Population Growth Rate of natural increase:
NRI= CBR-CDR
CBR 35 by 1000 people
CDR 5 by 1000 people
NRI = 30 by 1000 people
Divide by 10 to express
Double time = 70/ RNI
Problems with crude measurements:
-does not consider the population structures
-to overcome these processes you have to included other indices
-The increase of pop, gives us a perdicive perspective on society
-rate of natural increase, doubling time
-immgiration helps to stabilize pop and grow pop
-
problems with crude measurments
-crude birth and crude death rate
does not consider the population structure
-how to over come these problems
introduce additional indices
Total fertility rate(TFR)
Av # of children a women will have, assuming she has children at the privileging sp rates as through fertility
range**
Consider the structure of pop
The additude towards fertility
Predictive
Age profile of pop
Culture of pop
-Atti towards birth role of female, age of marriage,contraception
Economic structure
-need/cost of children
Infant mortality rate is
-death under 1 year of age per 1,0000 live births
tells us about the economic rate
What inflluences infant mortality/
Food and water
Medical facitlites
Age of mother
Levels of poverty
How is IMR more information the CDR