BIOLOGICAL INTERACTIONS
COMPETE | CONSUME | COEXIST

FOR YOUR NOTEBOOK

Community Interactions

• Competition: more than one organism uses a resource at the same time (-/-)

  • Resources include: food, water, space, and light

  • Weak vs. Strong - who will win?

• Predation: one organism pursuing and consuming another organism for food (+/-)

  • Predator: organism that pursues another organism

  • Prey: the organism that is pursued

    • Cat and bird, shark and seal, venus flytrap and insects

• Symbiotic relationships: relationship that exists when two or more species live together

  • Mutualism: two or more organisms that live closely together and benefit from each other (+/+)

    • Sloth and algae

  • Commensalism: a relationship in which one organism benefits and the other organism is neither helped nor harmed (+/0)

    • Clownfish and anemone

  • Parasitism: one organism benefits at the expense of another organism (In most cases, the host is only harmed or weakened, not killed.) (+/-)

    • Dogs and ticks