Populations.

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Presentation transcript:

Populations

Inquiry Activity

Inquiry Activity

Inquiry Activity

What is a Population? Group of the same species in an area

Characteristics of Populations Geographic distribution Density Growth rate Age structure

Geographic distribution An area that is inhabited by a population Can vary in size

Density Population density – number of individuals per unit area Depends on the species and its ecosystem

Growth Rate 3 Factors Affect Population Size: Number of births Number of deaths Number of individuals that enter/leave the population Emigration – individuals Exiting the population Immigration – individuals coming Into the population

Growth Rate Exponential Growth Logistic Growth Occurs under ideal conditions Logistic Growth Occurs when a population’s growth slows/stops

Growth Rate Carrying capacity – maximum number of individuals that an environment can support

Limits to Growth Limiting factor – something that causes a population’s growth to slow down or stop 2 Types Density dependent Density independent

Limits to Growth Density Dependent Density Independent Competition Predation Parasitism/ disease Density Independent Climate extremes/natural disasters Ex: drought Human disturbances

Age Structure Population growth depends on how many people of different ages make up a population

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