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Chapter 17 Sec 2 How Competition Shapes Communities Niche • A species’ role in the ecosystem What is does, where it eats, what it eats, what it makes its nests from, where it gets water…. • There is competition when 2 niches overlap Niche • In response, a species may occupy only part of the niche that it could • Fundamental niche the range an organism COULD occupy • Realized niche the part the species ACTUALLY occupies Niche • Ex. page 366 • Cape May Warbler only eats from the top. Why? • Other Warblers eat from other parts of the tree • Resource partitioning they have divided the niche • Ex. Barnacles Competitive Exclusion • When 2 species compete, the species that uses the resource most efficiently may eliminate the other • Ex. Paramecium Biodiversity • Predation reduces competition between prey species which increases biodiversity • Example-pg. 370—Sea Stars • The more biodiverse an area, the more species richness, the more stable an ecosystem
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