Term
| Mechanisms of Interspecific Competition |
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Definition
| Consumption, preemption, overgrowth, chemical interactions (allelopathy, territoriality, encounter |
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Definition
| Happens when one species inhibits another by consuming a shared resource. |
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Definition
| Results when a physical resource is occupied by one organism and therefore made unavailable to others. |
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Definition
| Occurs when one organism grows directly over another (with or without physical contact). |
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Term
| Chemical Competition (Allelopathy) |
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Definition
| Involves production and release of chemical growth inhibitors or toxins. |
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Definition
| The aggressive behavioral exclusion of organisms from specific units of defended space. |
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Definition
| Occurs when nonterritorial encounters between foraging individuals result in negative effects on one or both. |
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Definition
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Definition
| Equations giving the values of N1 and N2 that yield zero population growth for each species; can be arranged in four relative positions or different competitive outcomes. |
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Term
| Principle of Competitive Exclusion |
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Definition
| Two species with identical niches cannot coexist indefinitely; one will be a better competitor and thus have higher fitness, eventually excluding the other. |
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Term
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Definition
| Feature of the environment that is required for growth, survival, or reproduction and which can be consumed or otherwise used to the point of depletion. |
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Term
| Nonresource (Physical) Factor |
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Definition
| Feature of the environment that affects organism function and population growth rates but is not consumed or depleted. |
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Definition
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Term
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Definition
| n-dimensional hyper-volume where n denotes the number of environmental factors important to survival, growth, and reproduction of a species. |
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Term
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Definition
| Full range of conditions that an organism free from interference from one species could use. |
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Term
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Definition
| Includes interactions such as competition that may restrict environments where a species may live. |
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Term
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Definition
| Where i and j refer to two different species, and pjh refer to the fractional contribution of resource h to the total use of n different resources by species i and j. |
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Term
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Definition
| Changes in the physical characteristics of a species' population as a consequence of natural selection for reduced interspecific competition; because degree of competition is assumed to depend upon degree of niche overlap, interspecific competition has been predicted to lead to directional selection for reduced niche overlap. |
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