S&S 2.2. Respond to the following question in your lab notebook:
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Transcript of S&S 2.2. Respond to the following question in your lab notebook:
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S&S 2.2
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Respond to the following question in your lab notebook:
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I can create a food web that shows the transfer of chemical energy within an ecosystem, and I understand that not all energy makes it to the next level.
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Food chain- a linear representation of how food is transferred from one organism to another.
Food web- A web that shows all of the feeding relationships within an ecosystem.
Trophic Level- feeding levels within an ecosystem- the producers are in the first trophic level.
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Law of Conservation of Energy- Energy cannot be lost because it cannot created or destroyed.
Calories- a measure of the amount of energy stored in food.
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Every organism, dead or alive is a potential source of food for other organisms
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Used to show how energy is transferred, via food, from producers to primary consumers, from primary to secondary consumers, and so on
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In nature, many consumers feed on both producers and other consumers, because of this, a Food Chain may not adequately describe all the pathways of energy transfer.
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A diagram that illustrates the transfer of chemical energy within an ecosystem
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Based upon its position in the Food Web, each member of an ecosystem can be assigned to a Trophic Level
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Producers [plants and plankton]
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Primary Consumers [usually herbivores]
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Secondary and tertiary consumers [carnivores and omnivores]
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Whenever one organism eats another, chemical energy is transferred to a higher trophic level
Some energy is not used by the consumer; some is transformed into heat, some remains in the food not eaten
The amount of energy stored in food is measured in CALORIES
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Draw a Food Web, showing energy transfer among:Trout GullsHumans CatfishMinnows BacteriaInsects PhytoplanktonHerbivorous zooplanktonCarnivorous zooplankton
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1. Rank the organisms in your Food Web from most abundant in the ecosystem to least abundant in the ecosystem. Explain how you determined your rankings.
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2. When 1 organism eats another, not all of the energy stored in the food gets transferred to the consumer. What happens to the energy that is “lost” during each transfer?
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3. In 1 m3 of a typical open ocean ecosystem, phytoplankton can generate 1,600,000 Calories of chemical energy per year. Assume there is an 80% “loss” of usable energy during transfers from one trophic level to another. Make a Data Table AND Graph showing energy available at each of the first 5 Trophic Levels.
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Trophic Level Available Energy [Calories]
1st 1,600,000
2nd
3rd
4th
5th
TITLE?
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Manipulated Variable
Responding Variable
TITLE?
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4. How many more humans could be fed if everyone ate from the second trophic level rather than the fifth. Is this a reasonable possibility? EXPLAIN.