chapt57 - Dynamics of Ecosystems Chapter 57 1 Flow of...

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1 Dynamics of Ecosystems Chapter 57
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2 Flow of Energy in Ecosystems Energy is never recycled Energy exists as; Light Chemical-bond energy Motion Heat First Law of Thermodynamics: energy is neither created nor destroyed; it changes forms
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3 Organisms cannot convert heat to any of the other forms of energy Second Law of Thermodynamics: whenever organisms use chemical- bond or light energy some is converted to heat (entropy) Earth functions as an open system for energy Sun our major source of energy Flow of Energy in Ecosystems
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4 Earth’s incoming and outgoing flows of radiant energy must be equal for global temperatures to stay constant Human activities are changing the composition of the atmosphere Greenhouse effect: heat accumulating on Earth, causing global warming Flow of Energy in Ecosystems
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5 Trophic levels: which level an organism “feeds” at Autotrophs: “self-feeders” synthesize the organic compounds of their bodies from inorganic precursors Photoautotrophs: light as energy source Chemoautotrophs: energy from inorganic oxidation reactions prokaryotic Flow of Energy in Ecosystems
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6 Heterotrophs: cannot synthesize organic compounds from inorganic precursors; animals that eat plants and other animals; fungi that use dead and decaying matter (detritivores) Flow of Energy in Ecosystems
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7 Trophic levels Primary producers: autotrophs Consumers:
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chapt57 - Dynamics of Ecosystems Chapter 57 1 Flow of...

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