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Organismal Relationships

Organismal Relationships. An organism that eats another organism Bear eats fish Fox eats rabbit Lion eats zebra. Predator. An organism that is eaten by another organism Bear eats fish Fox eats rabbit Lion eats zebra. Prey.

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Organismal Relationships

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  1. Organismal Relationships

  2. An organism that eats another organism • Bear eats fish • Fox eats rabbit • Lion eats zebra Predator

  3. An organism that is eaten by another organism • Bear eats fish • Fox eats rabbit • Lion eats zebra Prey

  4. What would happen if a family of lions (5 lions) moved into a savannah with 100000 zebras? • What would happen if the lions had babies and after a while there were 1000 lions? Practice!

  5. The predator/prey interactions cause the populations to rise and fall in line with each other, since both animals' population sizes depend on factors from the other species so much. Why are predator/prey relationships important?

  6. Lynx-Hare Model

  7. A close relationship between two or more organisms of different species that may, but does not necessarily, benefit each one. • Parasitism • Mutualism • Commensalism Symbiotic Relationships

  8. Predation(+/-) is where one organism eats another. Symbiotic Relationships

  9. Parasitism(+/-) is where the parasite obtains food at the expense of the host.

  10. Mutualism (+/+) is where both organisms benefit from the relationship.

  11. Commensalism(+/o) is where one organism benefits while the other is neither harmed nor helped.

  12. The number of organisms in a population that live within a given area(length x width) • The amount of space for each organism Population Density

  13. Equation Population Density = #organisms/area Population Density

  14. A deer population of 75 lives in a 150 square mile park. • A deer population of 20 lives in a 38 square mile park. Which population is more crowded?

  15. We are going to figure out the population density of this classroom with all of us in it. Population density of our room

  16. What makes populations change?

  17. Immigration: organisms move IN to a certain community • Raise or lower? • Emigration: Organisms move OUT of a certain community • Raise or lower? Moving in or out

  18. Birth Rate/Death Rate

  19. The number of offspring that are born to a community within a timeframe • Would this increase or decrease a population? Birth Rate

  20. The number of organisms in a community that die within a certain timeframe • Example: 5 deer in Sharon woods died this year Death Rate

  21. Diagram shows: • Number of males and females in a population • Number of individuals at each age group Age Structure Diagram

  22. Rapid Growth • High birth rates • Deaths at each level-numbers decrease at each age group • Slow Growth • Fewer births • Organisms live longer generally • No Growth • Very few births • Organisms live very long Type of Age Structure Diagrams

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