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Chapter 35 - Populations

Chapter 35 - Populations. Populations. Can change over time Must determine the limits of an area Population Density - Ex - _________________________, or _____________________________________________. Question. What would rather receive? $1000 per day for a month

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Chapter 35 - Populations

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  1. Chapter 35 - Populations

  2. Populations • Can change over time • Must determine the limits of an area • Population Density - • Ex - _________________________, or _____________________________________________

  3. Question • What would rather receive? • $1000 per day for a month • 1 penny to start with and then double it each day for a month

  4. How fast can a population go? How big can a population get? • A group of animals can have ______________ __________________ - which means they do the same thing as the penny example • PROBLEM -

  5. What keeps a population under control? • Limiting factors - • Examples: • Carrying capacity - • # of births = # of deaths so the population won’t get any larger

  6. Carrying Capacity

  7. Factors affecting Population Growth • Density dependent factors - • Food - more food = • Disease - • Ex - Chronic Wasting disease in deer =

  8. Factors affecting Population Growth • Density Independent Factors - • Weather • Floods

  9. Species Interaction • When 2 species compete with each other for a particular resource - ______________ ___________________

  10. Niches • Each animal in a community has its special role

  11. Predation • Predator - • Examples: • Prey - • Examples:

  12. Predator Adaptations • Predators must be “smart” enough to catch their prey • Camouflage - • _______________ - wolves

  13. Prey Adaptations • Prey wants to avoid being eaten • Camouflage - • “Warning coloration” - • Mimicry - • Plants -

  14. Symbiotic Relationship • When _____ organisms live in or on each other • 3 types symbiotic relationships • Parasitism • Mutualism • Commensalism

  15. Parasitism • 1 organisms benefits (________), 1 organism suffers (_________) • Usually the _____________ is smaller than the host • Examples :

  16. Mutualism • Both organisms benefit from the situation • Examples:

  17. Commensalism • 1 organism benefits, the other doesn’t care • Examples

  18. Disturbances to a Community • Major, sudden changes are called ____________ • Natural disturbances - • _________________ - clearing a forest to grow crops, a ship sinking to the ocean floor

  19. Ecological Succession • __________________ - 1st step - small mosses begin to grow on rock and forms the first soils • ___________________ - When a disturbance damages a community, but the soil is still there

  20. Succession

  21. Humans and Species Diversity • ________% of the land on earth is used by humans • Clearing the land - • _________________ - species that are moved into a particular area - called __________ _____________

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