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15 Cards in this Set
- Front
- Back
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define the two key things ecosystems consist of
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-biological community: plants/animals
-physical environment: living/non-living nutrients, soil, sunlight |
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describe the differences between the community and ecosystem approach
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-communities focus on individuals and species, and their interactions, and species diversity
-ecosystems focus on energy flow and how nutrients and other factors (precip., light) affect productivity and the flow of energy |
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how does energy flow through ecosystems?..where does it start, how does it end
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Continual input of energy from the sun is taken up by plants (Lots of energy). Consumers get some of this by eating plants. However, A LOT of energy is lost to the side by respiration
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describe the 2 main points about energy flow through ecosystems
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-continual input of energy by the sun is mandatory
-energy transfers are inefficient and some energy is lost to respiration and heat |
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what is the difference in biomass and energy flow between grasslands, forests, and open oceans
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forests: lots of bark which is inedible, so plants do not support a large herbivorous group
ocean: plants turnover rapidly so they can support a large herbivorous population |
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what are the 4 global compartments
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ocean (salt water)
fresh water (lakes, rivers) land atmosphere |
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define pools
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stockpiles of energy and nutrients
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define fluxes
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transfer between pools
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define sinks
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pools that have remained unavailable for long periods of time
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what is the difference btwen flows and cycles
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-flows: input of energy from the sun to plants, some energy is lost to entropy (open system)
cycles: materials are recycled and reused |
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what is GPP
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-gross primary production
-total amount of CO2 consumed by plants -measured as O2 production |
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what ER
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-respiration
-metabolism of plants -measured as O2 consumed |
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what is NPP
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net primary production
-productivity (amount of energy available to primary consumers who eat producers) NPP = GPP - ER |
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how is light/temp related to productivity (NPP)
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they are positively correlated
-lots of variation |
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how is precipitation related to productivity (NPP)
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they are positively correlated, with assymtote as precip increases
-lots of variation |
