A PowerPoint Presentation by Mr. Jackson

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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

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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.
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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. Im 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/AnimM
ovie/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
Predators
Reproduction
Next
Parasites
Human Impact
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Its all coming together
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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?