Download Community Interaction

Review: Levels of organization
BIOSPHERE
BIOME
ECOSYSTEM
COMMUNITY
POPULATION
ORGANISM
Community Interactions
• Community: Many
species interacting
in the same
environment
• Three types of
interactions:
– Competition
– Predation
– Symbiosis
Competition: struggle between individuals for limited
resources (water, nutrients, light, food, mates).
What’s going to happen?
Competitive exclusion: no two species can
occupy the same niche in the same habitat at the
same time
Predation
• Defined: when an organism captures and feeds on
another organism.
• Predator- hunter
• Prey- hunted
Symbiosis- Long term relationship between
species living closely together.
Three types:
•Mutualism
•Commensalism
•Parasitism
Mutualism
•
•
•
•
Mutualism: both species benefit from a relationship.
Ex: Lichens (fungus and Algae)
Ex: Clown fish and anemones
Ex: Cleaner birds and crocodiles
Commensalism
• Commensalism – One member of a symbiotic relationship benefits
and the other is neither helped or harmed
• Ex: Cattle and Birds
– Birds eat insects stirred up by the cattle
• Ex: Barnacles and whales
– Barnacles grow on whale
Parasitism
• Parasitism- One
creature benefits
and one creature
is harmed
• Ex: Tapeworm
feeds in a
humans
intestines
absorbing his/her
nutrients
Review
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6)
What is a community?
Name the 3 types of community interactions.
When do organisms usually compete?
How do predators and prey interact?
Name the 3 types of symbiosis.
How does mutualism, commensalism, and
parasitism differ?