Ecosystems

Ecosystems - SCI Notes 3/15 Laposata Ecosystems and...

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SCI Notes 3/15 Laposata Ecosystems and Ecological Communities PDF (What is an Ecosystem) Life and Ecosystems o Life and Interactions: Life is a function of ecosystems, not organisms Organisms depend on each other for survival Ecosystem impacts cascade through various organisms No Organisms makes their own food and decomposes their own wastes o PDF (Ecosystem interactions) Ecosystems o Connection: Ecosystem is a system Behaves like a system o Human Impacts: System’s operation affected by human activities o PDF (Ecosystem Components) o PDF (Biotic Components) o PDF (Trophic Levels) o Food Chains Reality: Nature does not operate so simply For Example: You’re eating a chicken Caesar salad…. .What’s your trophic level
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o Food Webs Reality: Trophic structure of ecosystems = web, not chain Organisms simultaneously occupy > 1 trophic level Trophic level changes with growth PDF (Forrest Food Web) Ecosystem Energetics o PDF (Energy flow in ecosystems) o Autotrophs and energy Photosynthesis produces sugar (chemical energy) Respiration metabolizes most of the sugar Remaining sugars (small %age) converted to biomass o Production Gross Production The production of organic matter (sugar = biomass) by an organism
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This note was uploaded on 06/16/2011 for the course SCI 1101 taught by Professor Jbrock during the Spring '07 term at Kennesaw.

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Ecosystems - SCI Notes 3/15 Laposata Ecosystems and...

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