chapter 5 – ecosystems cont’d
DESCRIPTION
Chapter 5 – Ecosystems cont’d. A Simple Ecosystem. Yellowstone Park Hot springs! . What’s a hotspring?. A spring of naturally hot water, typically heated from rocks and minerals under the earth’s crust. How hot? . As hot as 143 degrees !. Why is the ecosystem so simple?. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 5 – Ecosystems
cont’d
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A Simple Ecosystem0 Yellowstone Park0 Hot springs!
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What’s a hotspring?0A spring of naturally hot water, typically heated from
rocks and minerals under the earth’s crust.
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How hot? As hot as 143 degrees !
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Why is the ecosystem so simple?
0Would you like to live here???
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0 Snow, burning water, acidic water, alkaline water, yikes!
0 Trophic Level 1 = photosynthetic bacteria and algae
0 Trophic Level 2 = Ephydrid flies(herbivores)
0 Trophic Level 3 = dolichopodid fly, dragonflies, wasps, spiders, tiger beetles, killdeer (carnivores)
0 Trophic level 4 = bacteria
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I guess there are some Complications
0The Kildeer eats in this ecosystem and lots of other ecosystems.
0Should we consider it a total member?
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More complications
0Ephydrid flies have parasites. How do we add those into the food web?
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What maintains it all?
01. sunlight which provides usable energy02. constant flow of hot water which supplies chemical
elements and a habitat for bacteria and algae
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Hot springs
0…only about 20 species0Still pretty complex0See page 85
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Different food chains
01. Oceanic0 “pelagic”
02. Terrestrial0 land
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Pelagic food chain
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Phytoplankton and zooplankton
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Journal of the Week -Human Role
0Should we include people within the ecosystem’s food web? That would place us within nature. Or should we place people outside of the ecosystem, thus separate from nature?
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Energy Flow in Ecosystem
0Ecosystem energy flow = the movement of energy through an ecosystem from the external environment through a series of organisms and back to the external environment0 1. Food webs0 2. heat travels through air/water/convection (in
ground)
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Energy flow, cont’d
0First law of thermodynamics0 Law of conservation of energy0 Energy is neither created nor destroyed, just changed
from one form to another0Second law of thermodynamics
0 No use of energy in the real world can ever be 100%0 Energy lost to heat0 Entropy energy becomes more and more disorganized
as it travels through the ecosystem