The "Niche concept" has many slight variations. This activity introduces the niche concept and the difference between realized and fundamental niches using Paramecium. There is a second activity with a simulation of the Paramecium experiment of Gause illustrating competitive exclusion before a final activity about symbiosis in coral reefs between the coral polyps and a dinoflagellate algae, "Zooanthella".B4.2.12—Fundamental...