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SPECIES INTERACTIONS Community Interactions Competition – occurs when organisms of the same or different species attempt to use an ecological resource in the same place at the same time. Resources: water, food, light, space. Community Interactions Predation – when an organism feeds on another organism (predator prey) Symbiosis – Any relationship in which two species live closely. Mutualism Commensalism Parasitism Mutualism (++) When both species benefit from the relationship Example: Many flowers depend on insects to pollinate them. Bugs help flowers reproduce and flowers provide bugs with nectar, pollen, etc. Commensalism (+0) One member benefits and the other is neither helped nor harmed. Example: barnacles attach to a whale’s skin. Barnacles are able to filter feed from water rushing past them but they do nothing, good or bad, for the whale. Parasitism (+-) One organism lives on or in another organism and harms it. Examples: fleas, ticks, tapeworms, zombie snails…. Zombie Snail Video http://www.youtube.com/watch?v=EWB_COSUXM w&safety_mode=true&persist_safety_mode=1