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Definition
| A regular (usually monotonic)changes in gene frequency over a geographic space |
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| A commodity that is required by an organism and is potentially in short supply |
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| Species that are structurally important for the organization of community; ie abundant species like reef-forming corals and sea grasses |
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| A single organism capable of independent existence |
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Definition
| A species whose activities strongly affect the physical structure of the environment; often used interchangably with foundation species |
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Definition
| All the individuals of one species in a given area |
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Definition
| A group of species living together and interacting through ecological processes such as competition and predation |
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| A group of interdependent biological communities and abiotic factors in a single geographic area that are strongly interactive |
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| The living organisms on Earth |
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| The range of physical and biolgical habitats occupied by a species |
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Definition
| Number of individuals per unit area of volume |
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Definition
| The amount of living material per unit area or volume; may be expressed as grams of carbon, total dry weight, etc |
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