Primary Production and Energy Flow Chapter 18 - De Anza College

Primary Production and Energy Flow Chapter 18

Sunlight to photosynthesizer to herbivore to carnivore to decomposer!!!

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Ecosystem Ecology

? The study of the flow of energy, water, and nutrients in an ecosystem An ecosystem is a biological community + all the abiotic factors that influence that community!

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Introduction ? some terms!

? Primary production: Fixation of energy by autotrophs in an ecosystem. Rate of primary production: Amount of energy fixed over a given period of time. Gross primary production: Total amount of energy fixed by autotrophs. Net primary production: Amount of energy leftover after autotrophs have met their metabolic needs.

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Introduction ? some more terms!!!

? Trophic Level: Position in a food web determined by number of energy transfers from primary producers to current level: Primary producers occupy first level. Primary consumers occupy second level. Secondary consumers occupy third level. Tertiary consumers occupy fourth level.

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Patterns of Terrestrial Primary Production ? Terrestrial primary production is generally

limited by temperature and moisture. Highest levels of primary production ?

warm & moist

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