BIOL 2Q04 Lecture Notes - Lecture 20: Zion National Park, Trophic Cascade, Spatial Scale
2 Dec 2015
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Rotation period: mean time needed to disturb an area. Newer model since it seems that communities are not that often that Occupied by one sessile organism or home range of a mobile organism. By the end in communities all play a role. Everything is dynamic and competition, predation and environmental factors. Two polar views of community organization: o o. Top down: predation controls (also called trophic cascade model) Interesting systems: size of the island and distance from source will be important. Immigration rate will decline as the number of species on the island increases. Rate of species extinction on the island will increase with species number extinction rate. An equilibrium species richness (s) is achieved when immigration rate= Climate (tropical versus arctic, humid versus arid, etc. ) Location relative to ocean currents (influences nutrient, fish, bird, and seed flow patterns) Landscape elements: visually distinctive patches in an ecosystem. Mosaic= patchwork of different types of land cover.
