Populations

Geographic distribution – the area a pop lives(range)

Population Density – the number of individuals in an area

Number of births Number of deaths Emigration (out) & Immigration (in) Population Growth Number of births Number of deaths Emigration (out) & Immigration (in)

In Springfield, 45 babies are born in the year 2008 In Springfield, 45 babies are born in the year 2008. 15 people died that same year. What is the growth rate for the city? Positive Growth rate = population increase Negative Growth rate = decrease

Exponential Growth –reproduce at a constant rate Exponential Growth –reproduce at a constant rate. Occurs under ideal conditions (no limits) J-shape curve

Logistic Growth – resources become less available, growth slows or stops S-shape curve Carrying Capacity – the number an environment can support

Limits to Growth Limiting Factor – causes population growth to decrease Density-Dependent Factors –depends on population size competition predation parasitism and disease

Density-Independent Factors – does not depend on population size Unusual weather Natural disasters Some human activities

DEMOGRAPHY

the study of human population growth - explains how populations change over time.

Demographic Transition – a dramatic change in birth and death rates United States, Japan, and Europe population growth has stopped ZERO POPULATION GROWTH

In order to achieve ZPG, each couple has only 2 children

AGE STRUCTURE DIAGRAMS Show percentage of people alive at each age group

Which diagram above is: 1. A country where the king orders the deaths of all the baby boys 2. A country at war, many young men die in that war 3. A country with poor health care for women, many die in childbirth 4. A country where AIDS kills people in their 30s