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Relationships between organisms Competition More than one organism tries to make use of the same limited resource Predator / Prey One species (prey) is hunted as food for another (predator) Symbiosis A close relationship between two species Three types… Mutualism Relationship where both species benefit. Win - Win Commensalism Relationship where one species benefits and the other is unaffected Parasitism Relationship where one species (parasite) benefits and the other species (host) is harmed. “Living Together” “Friends and Rivals” What would happen if we changed just one variable in an ecosystem? Biotic Abiotic Biomes Biomes Big Cottonwood Canyon Snowbird Ski Resort Little Mountain Moab Great Salt Lake Biome, Sweet Biome Hula Hoop Habitat Magnification of DDT Feral Pig Golden Eagle Island Fox (Urocyon littoralis) Island Fox Pre-1963: 1000’s in the Channel Islands Island Fox Post-1963: steady decline in Island Fox population Island Fox Some Island Fox subspecies now extinct (in the wild) Island Fox Santa Cruz Island – from 1500 to 100 individual foxes Golden Eagle Relocating Golden Eagles helps, but .. . More migrate in to replace them. Golden Eagle Time is of the essence. 100 to 30 in the next couple of years. Bald Eagle Eagle vs. Eagle Balance of Nature Returning 96% Survival Rate Current Science Events Local Practice Affecting Ecosystems and Global Practice Affecting Ecosystems ‘N Cyst A sea monkey’s no monkey or chimp. It’s crustacean – better known as brine shrimp. This genus, Artemia, Can deal with extremia. As a cyst stage, it’s hardly a wimp. - C. Drewes Brine Shrimp Lab Hee Hee