Energy and Ecosystems

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What is included in a food chain?
Producers, Consumers and Decomposers
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Where are there energy losses in a food chain?
Respiration, not all light from the sun gets to the producer, sometimes its in the wrong wavelength, sometimes the suns energy is used for evaporation, feeding, faeces, not all of the organism is eaten, death and decay
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What is the equation for Net Production?
Net production = gross production - respiratory losses
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What is the equation for energy transfer?
energy transfer = (energy available after the transfer/ energy available before the transfer) x 100
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What are the three types of ecological pyramids?
Number, biomass and energy
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What are the pros and cons of number pyramids?
Pros: Easy to interpret, easy to put together. Cons: Size isn't taken into account, it can invert
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What are the pros and cons of biomass pyramids?
Pros: More reliable, takes size and number into account. Cons: Can invert when investigating zooplankton and phytoplankton, specimens have to be dead
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What are the pros and cons of energy pyramids?
Pros: Never inverts, takes biomass and number into account. Cons: Specimens have to be dead
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What is an agricultural ecosystem?
Made up largely of domesticated animals and plants used to produce food for mankind
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What two factors effect Net Productivity for agricultural ecosystems?
1. The efficiency of the crop at carrying out photosynthesis. 2. The area of the ground covered by leaves of the crop
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What are the features of an agricultural ecosystem?
1. Energy is provided by the sun, food and fossil fuels. 2. Higher productivity. 3. Less species and genetic diversity. 4. Population is controlled by both natural and artificial means. 5. Prevented from reaching climax community
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Other cards in this set

Card 2

Front

Respiration, not all light from the sun gets to the producer, sometimes its in the wrong wavelength, sometimes the suns energy is used for evaporation, feeding, faeces, not all of the organism is eaten, death and decay

Back

Where are there energy losses in a food chain?

Card 3

Front

Net production = gross production - respiratory losses

Back

Preview of the back of card 3

Card 4

Front

energy transfer = (energy available after the transfer/ energy available before the transfer) x 100

Back

Preview of the back of card 4

Card 5

Front

Number, biomass and energy

Back

Preview of the back of card 5
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