Term
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Definition
A group of populations whose evolutionary history is distinct and independent from that of other goups.
a distinct and independent path is achieved by the group's reproductive isolation from other groups. |
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Definition
| Pattern of community development. |
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Definition
| Development of a community "new" to the area. |
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Definition
| Recovery of a community after a disturbance. |
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Term
| Selection in Polygenic Phenotypes |
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Definition
Polygenic Phenotypes display continuous variation.
Often the phenotypic frequency will approximate a normal distribution.
Selection will involve a portion of the phenotypic range having a higher fitness. |
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Definition
| Phenotypes too far from the phenotypic norm have a reduced fitness. |
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Definition
| Phenotypes at one end of the phenotypic range have a higher fitness. |
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Term
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Definition
| The environment varies in space or time and different portions of the phenotypic range have a higher fitness under the varying environmental conditions. |
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Definition
| Allopatric, Parapatric, Sympatric, VIA Founder Effect |
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Term
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Definition
Speciation is initiated via a barrier to gene flow.
Differentiation is due to selection and/or drift. |
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Term
| Speciation VIA Founder Effect |
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Definition
Speciation initiated via a unique colonization event.
The event itself causes some differentiation and subsequent isolation facilitates it. |
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Term
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Definition
There is no specific extrinsic barrier to gene flow.
Species is subjected to differing selecting pressures across its range.
Selection and limited dispersal lead to interdemic differentiation. |
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Definition
| Speciation without any geographical component; reproductive isolation develops in spite of potentially high levels of gene flow. |
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Term
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Definition
| A density-dependent factor may stabilize otherwise unstable competitive relationship by keeping population sizes at levels low enough to permit coexistence. |
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