Term
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Definition
| The group of species that occupy a given area, interacting either directly or indirectly |
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Definition
| The simplest measure of community structure is a count of the number of species occurring within the community |
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Definition
| The most abundant species is plotted first along the x-axis with the corresponding value on the y-axis being the value of relative abundance |
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Definition
| A more equitable distribution of individuals among the species |
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Definition
| By counting all the individuals of each species in a number of samples with a community and determing what percentage each species contributes to the total number of individuals of all species |
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Definition
| Consider both the number and the relative abundance of species with the community |
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Definition
| measures the probability that two individuals randomly selected from a sample will belong to the same species |
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Definition
| A widely used index of diversity that also considers both species richness and evenness |
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Definition
| When a single or few species predominate with a community |
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Definition
| A species that has a disproportionate impact on the community relative to its abundance |
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Definition
| Feed on no other species but are fed upon |
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Definition
| Feed on other species and they are prey of other species |
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Definition
| Are not subjected to predators, they prey on intermediate and basal species |
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Definition
| A division into groups of species that exploit a common resource in a similar fashion |
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Term
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Definition
| Primary site of energy fixation through photosynthesis |
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Term
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Definition
| Layer below canopy richness based on how much light the canopy allows through |
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Definition
| Dependent upon soil mosture and nutrient conditions, slope postion layer below Understory |
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Term
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Definition
| Lowest level where microbial organisms feeding on decaying organic matter releases mineral nutrients for reuse by the forest plants |
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Term
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Definition
| where the availability of light supports photosynthesis primarily by phytoplankton (top level) |
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Term
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Definition
| an area without light (below photic zone) |
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Definition
| The bottom zone where decomposition is most active |
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Definition
| The changes in the physical and biological structure of communities as one moves across the landscape |
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Term
| Organismic concept of communities |
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Definition
| Development of the community through time (a process termed succession) |
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Term
| Individualistic or continuum concept |
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Definition
| States that the relationship among coexisting species is due to similarities in their requirements and tolerances, not to strong interactions or common evolutionary history |
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