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| the area drained by a single stream or river |
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| the series of changes in the abundance of speacies in a food web, usually caused by the aditon or removal of a key predator |
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| the hypothesis that population size is limited by predators or herbivores (consumers) |
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| ina food chail or food web , organisms that feed on secondaryconsumers. |
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| a carnivore; an organism that eats herbivores |
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| A decomposer (detritivore) that consumes detritus from plants |
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| an herbivore; an organism that eats plants algea or other primary producers. |
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| the timing of events during the year, in environments where seasonal changes occur. |
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| the timing of events during the year, in environments where seasonal changes occur. |
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Term
net primary productivity (NPP)
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| in an ecosystem, the total amount of carbon fixed by photosynthesis over a given time period minus the amout oxidezed during cellular respiration |
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| gross primary productivity |
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Definition
| in an ecosytem, the total amount of carbon fixed by photosynthesis including that used for cellular respiration, over a gien time period. |
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| an atmospheric gas that absorvs and reflects infrared radiation. |
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| a sustianed increase in earths average surface temperature. |
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| the global sum of all the local changes in temp.. and precipitation patterns that accompany global warming |
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| a relatively simple pathway of energy flow through a few species, each at a differnet throphic level, in an ecosystem. might include for example a primary producer, primary consumer, secondary consumer and a decomposer |
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| an ecological network of detritus, decomposers that eat detritus, and predators and parasites of the decomposers |
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| un underground layer of porus rock sand or gravel that is saturated with water |
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