ch 9 ppt
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TRANSCRIPT
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Chapter 9Biological Productivity
and Energy Flow
Case Study:
Can Enough Food be Produced for Africa???
How much can we grow???What will be our Carrying
Capacity?????
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The total amt of organic matter in an ecosystem =
It increases though growth
Plants, animals and dead are all biomass
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Biomass is measured in
It increases through growth.
This is
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Chemoautotrophs
Bacteria that use inorganic compounds (like sulfur) to make their own food and tissues
The white-ish area is a bacterial mat feeding on methane from beneath the ocean floor.
Hydrothermal vents
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Energy flow
Ecosystems are all open to energy flow
Energy in food chain heat released What is not used is lost (as heat), or stored!!!!
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1. kinetic- 2. potential-
energy can move back and forth between the two
Entropy-is the measure of disorder, wasted energy - becomes more random, can be sound or light but is mostly heat, everything always moves towards entropy
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The laws of thermodynamics
1st Law – conservation of energy
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2nd Law- entropy increases -energy moves to a less organized form
(living cells are holding off the forces of entropy by channeling energy).
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Energy flow is one way!
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Energy efficiency
How efficient are orgs at using energy? Not very! Rule of thumb is:
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Biomass Pyramid