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SECTION 8.1 NOTES

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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  1. SECTION 8.1 NOTES UNDERSTANDING POPULATIONS

  2. 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)

  3. 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)

  4. Exponential Growth • Organisms Grow faster and faster over time! • Conditions • Plenty of Food, Space, and no competition or predators

  5. 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.

  6. 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!

  7. Competition within a population • Organisms compete for resources such as: • Territory – Living Space • Mates • Food • Homes/Shelter

  8. 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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