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Unformatted text preview: Chapter 1- Introduction • Ecology derives from the greek word oikos, meaning house and refers to our surroundings and environment o Studies how organisms interact in and with the natural world • Ecological systems o Organism- smallest unit of ecology such as a cell, organ, or macromolecule Exchanges energy and materials with its environment o Ecosystem- lots of organisms together with their physical and chemical environments Large and complex including many thousands of different kinds of organisms living in a variety of individual surroundings Little energy and substances are exchanged between different ecosystems Energy flux and cycling of nutrients within o Biosphere- includes all environments and organisms on earth Linked together by exchanges of energy and nutrients carried by currents of wind and water and by the movement of organisms Global processes Outside the biosphere is only sunlight and space o Population- consists of many organisms of the same kind living together Typically have geographic ranges, certain number of individuals per unit of area, variations in size or composition o Community- many populations of different kinds living in the same place Predator/prey relationships No rigidly defined boundaries, no perceptible divide separates a community from its surroundings • Perspectives of Ecology o Organism approach- emphasizes the way in which an individual’s form, physiology, and behavior help it to survive in its enviro...
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This note was uploaded on 03/12/2012 for the course PB 360 taught by Professor Wentworth during the Fall '08 term at N.C. State.
- Fall '08