Lecture 30 - Bio 121 Lecture 30 ecosystems A. Introduction...

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Bio 121 Lecture 30 – ecosystems A. Introduction a. Ecosystem – all the organisms and environments in a given area b. Most inclusive level in biological hierarchy c. Function as self-sufficient units with recognizable inputs and outputs d. Forests, lakes, deserts e. Two emergent properties – properties that show up at a level that are not obvious at the level below e.i. Energy flow e.ii. Nutrient cycling B. Trophic levels and food webs a. Trophic structure – who eats who b. Food is transferred from level to level through food chain b.i. Begins with autotrophic organisms – producers b.ii. Primary consumers – usually herbivores b.iii. Secondary consumers – usually carnivores b.iv. Tertiary consumers – carnivores eating other carnivores b.v. detritivores – decomposers that derive their food from organic waste or dead organisms c. food web – complete set of food links among species in a community in an ecosystem C. Energy flow a. All organism need energy for growth, maintenance, and reproduction
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This note was uploaded on 03/12/2012 for the course BIO 121 taught by Professor Minchella during the Fall '10 term at Purdue University-West Lafayette.

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Lecture 30 - Bio 121 Lecture 30 ecosystems A. Introduction...

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