Biotic Relationships:

Community Interactions

Biotic Relationships1.Competition2.Predation3.Symbiosis

Competition• Organisms attempt to use a

resource in the same place at the same time

• Examples:– Water– Nutrients– Light– Food– space

Predation•One organisms captures and feeds on another

•Predator is the killer/eater•Prey is the food

Symbiosis• Any relationship in which

two species live closely together

• Three main classes:1.Mutualism2.Commensalism3.Parasitism

Mutualism• Both

species benefit

• Example: flower and bee

Commensalism•One benefits, the other is

neither benefited nor harmed•Example: barnacles and

whaleBarnacle filter feeds

Parasitism• One benefits, the

other is harmed

• Parasite lives on or in the host, and obtains some/all of its nutrients from host

• Examples: tapeworms, fleas, ticks, lice

What type of relationship?

• Remora and shark

• Remora uses shark for transportation and eats the shark’s leftover food

What type of relationship?

What type of relationship?

What type of relationship?• Clownfish clean anemones

• Sea anemones provide protective habitat