Population Growth and Decline
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Population Growth and Decline A PowerPoint Presentation by Mr. Jackson! BCHS FACTORS OF POPULATIONS Four factors determine the size of a population at any given time. The factors are; Death Rate Migration Birth Rate Emigration Wow this sounds interesting!

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Population Growth and Decline

A PowerPoint Presentation by Mr. Jackson!

BCHS


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FACTORS OF POPULATIONS

  • Four factors determine the size of a population

  • at any given time. The factors are;

  • Death Rate

  • Migration

  • Birth Rate

  • Emigration

Wow this sounds

interesting!


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Remember gang, population is the

number of individuals living

in the same space at the same time!


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Death Rate

The number of individuals that die within a specific time is known as the death rate.


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Migration

Migration of organisms that increase the population is

known as immigration.

Hey guys good

to see you


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Birth Rate

Birthrate is the number of offspring produced by

the population over a period of time.

Birth rate can be affected by:

  • Nutrition

  • Environment

  • Density of population


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Emigration

These guys are

all wet. I’m outa here!

Departures of animals from the regular population

is known a Emigration.


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Limiting Factors

Populations are limited by the the following influences:

Abiotic Factors - Are the nonliving influences on populations

such as Water, Matter and Weather.

Biotic Factors - Are the ways living organisms might affect

the size of a population, such as predators and parasites


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Predation

The relationship between predator and

prey is know as predation.

For a movie of a octopus eating a crab check here

http://animalpicturesarchive.com/animal/AnimMovie/boct07tv.html

For a close of Close up of a crocodile and a jaguar.

http://animalpicturesarchive.com/animal/AnimMovie/clos00tv.html

A cool animation of a great white shark swimming,

http://animalpicturesarchive.com/animal/AnimMovie/sharks.html


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Competition

Animals naturally compete for limited biotic and

abiotic resources.

To find more information click on the button

Reproduction

Predators

Next

Human

Impact

Parasites



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To Conclude

To review the concepts click on the term

Factors of

populations

Competition

Limiting

factors


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Predators

Predators consume other organisms for food energy


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Parasites

  • These organisms live off others in different ways

  • Parasitism

  • Mutualisism

  • Commentialisim


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Human Impact

Humans are one of the few organisms that changes the environment

to meet their needs. Can you list three ways we have done this?


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