Chapter 5 Populations

Chapter 5 Sec 1: How Populations Grow There are three important characteristics of a population:  _________________________ distribution (location)  Density (how many)  ___________________ rate

Population density The number of individuals per unit area.  IndividualsPop. Density Area Example: There are 800 deer in a 40 acre plot of land. What is the population density of the deer population?

Population Growth They’re 3 factors that can affect a populations size : The number of ______________ The number of _______________ The number of individuals that ___________ or ____________ a population

Immigration: The movement of individuals ____________an area. Emigration: The movement of individuals __________of an area.

TYPES OF GROWTH Exponential- “J” shaped curve. Slow growth at first with a sharp increase. Under ideal conditions with unlimited resources, a population will grow exponentially

Logistic- “S” shaped curve. As resources become less available, the growth of a population slows or stops. Populations reach Carrying Capacity

Carrying Capacity:  The Maximum (largest) number of individuals that an environment can support.

Section 2: Limits to Growth Limiting Factors: a factor that causes population growth to _________________. There are 2 types:  1) Density-dependent  2) Density-independent

Density-dependent Depends of the population’s _______________. Example: Competition, Predation, Parasitism, & Disease

Density-independent Does not depend on the populations’ size.  Example: Drought, Human Disturbances, Hurricane, Etc.

Chapter 5 Section 3: Human Population Growth Like other populations, the human population increases with time. The Agricultural Revolution & Industrial Revolution contributed to the rapid increase in the human population

Agricultural Revolution Populations changed from hunting & gathering to an agriculturally based civilization.

The Demographic Transition Frank Notestein is a scientist in the field of Demography  Designed a theory that explains the pattern of human population growth

“Economic & social progress of the industrial revolution affects population growth in 3 stages” Stage1: Both birth & death rates are high in pre-industrial societies, & the population grows slowly if at all.

Stage 2: When health care improves, the population size increases. Birth rates continue to be high & people are living longer

Stage 3: Birth rates fall until they are roughly equal to death rates, & population growth slows down & stops.

Age Structure Diagram Show the population of a country broken into categories based on age & gender.

Chp. 5 Test review Role Dice to determine the level of question. You may pick one level Continue to role until all questions are answered.