Section 8 1 notes
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SECTION 8.1 NOTES. UNDERSTANDING POPULATIONS. What is a Population?. Members of the same species (reproduce with one another) Live in the same place (Geographic location) Live at the same time (Past, Present, or Future). How Fast Can a Population Grow?.

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SECTION 8.1 NOTES

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Section 8 1 notes

SECTION 8.1 NOTES

UNDERSTANDING POPULATIONS


What is a population

What is a Population?

  • Members of the same species (reproduce with one another)

  • Live in the same place (Geographic location)

  • Live at the same time (Past, Present, or Future)


How fast can a population grow

How Fast Can a Population Grow?

  • Death Rate + Birth Rate = Growth Rate

  • Populations usually stay about the same.

  • Reproductive Potential

    • Fastest rate an organism can grow

    • Increase when organisms reproduce more often

    • Small organisms (bacteria) usually reproduce quicker than larger organisms (humans)


Exponential growth

Exponential Growth

  • Organisms Grow faster and faster over time!

  • Conditions

    • Plenty of Food, Space, and no competition or predators


What limits population growth

What Limits Population Growth?

  • Environment Changes

  • Resources are Used Up

  • Death Increases

  • Births Decrease

  • Carrying Capacity

    • Maximum population that the ecosystem for a particular species can support.


Resource limits

Resource Limits

  • Limiting Resources such as sunlight, nutrients, water.

  • Carrying capacity is reached when the resource is consumed at the rate that it is made!


Competition within a population

Competition within a population

  • Organisms compete for resources such as:

    • Territory – Living Space

    • Mates

    • Food

    • Homes/Shelter


Two types population regulation

Two Types Population Regulation

  • Density Dependent – cause of death is related to issues of overcrowding/space.

  • Density Independent – Not related to number of organisms but other factors such as weather, natural disasters, etc.


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