Organism InteractionInteractions in Ecosystems

Review: Predation• Occurs when one organism hunts and kills

another organism for food– Predator: the hunter– Prey: the hunted, killed, and eaten organism

• Predators have adaptations to help them hunt prey

• Prey have adaptations that help them avoid predators

Symbiosis• The relationship

between two organisms in which at least one is benefited; the other organism may benefit, be hurt, or be unaffected

Mutualism

• a relationship in which both organisms benefit.

Bees and flowers

Butterflies and flowers

Clown fish and sea anemone

Commensalism

• A relationship in which one organism receives benefits while not hurting or helping the other.

Dog under High Chain

Birds on Bison

Orchids on Trees

Parasitism

• a relationship where one organism benefits (the parasite) and the other is negatively affected (the host).

Mistletoe growing on trees

• Examples of common parasites:

Malaria parasite: is microscopic and infects individual cells. (develops and lives in the blood stream)

Tapeworm: The longest tapeworm ever removed from a human was ___37 feet____ in length. They live inside mammals digestive track.

Lancet Liver Fluke: organism found in uncooked meat.

Journal Questions:

• How are parasitism and predation different? How are they alike?

• Where would a parasite fit into the food web?

• Come up with 3 other examples of each type of symbiotic relationship.