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OTHER RELATIONSHIPS

OTHER RELATIONSHIPS. Can’t we all just get along?. Symbiosis. Symbiosis : a close relationship between 2 different species. Types of Symbiotic Relationships. Parasitism : one organism helped and the other harmed. Ex: flea on a dog, tapeworm in a human.

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OTHER RELATIONSHIPS

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  1. OTHER RELATIONSHIPS Can’t we all just get along?

  2. Symbiosis • Symbiosis: a close relationship between 2 different species

  3. Types of Symbiotic Relationships • Parasitism: one organism helped and the other harmed

  4. Ex: flea on a dog, tapeworm in a human

  5. Commensalism: 1 organism helped and the other not affected

  6. Ex: clownfish and sea anemone, barnacles on a whale

  7. Mutualism: both organisms benefit

  8. Ex: algae and fungus in a lichen, protist in termite gut

  9. Populations Change • 3 Factors that affect the size of a population: 1. # of births 2. # of deaths 3. immigration (# that enter) and emigration (# that leave)

  10. Exponential Growth • Growth that would occur under ideal conditions

  11. J shaped curve • In real life, this can’t happen for very long

  12. Logistic Growth • Populations usually grow and then level off because resources become less available

  13. Lack of food, lack of space for breeding, introduction of predators, and disease can slow growth • Carrying capacity: the maximum number of a species that can survive in the area • Carrying capacity can change from year to year because amounts of food, water, predators, disease can change

  14. Limiting Factors • When there is plenty of resources, populations can grow. • When resources are limited, populations decrease.

  15. Competition - individuals compete for resources that are needed to live

  16. Predator-Prey Interaction - when the amount of prey increases, the amount of predators can increase - when predators increase, prey will begin to decrease

  17. Disease - when population members are crowded together, disease spreads more quickly

  18. Weather/Natural Disaster - drought, severe winter, hurricanes, etc. can cause populations to decrease or even be eliminated

  19. Human Activities - destruction of habitat leads to more limited resources for the organisms living there

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