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Definition
| organisms that alter the surrounding chemical environment in such a way as to prevent other species from using it, typically with toxins or antibiotics |
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Definition
| any geographic feature that hinders or prevents dispersal or movement across it, producing isolation |
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| the study of the geographical distribution of life on earth and the reasons for the patterns one observes on different continents, islands or oceans |
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Definition
| the movement of alleles in space and time from one population to another |
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Term
| ideal despotic distribution |
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Definition
| a theoretical spatial spread of memebers of a population in which the competitive dominant aggressive individuals take up the best resources or territories, and less competitve individuals take up areas or resouces in direct relationship to their dominance status |
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Definition
| a theoretical spatial spread of members of a population in which individuals take up areas with equal amounts of resources in realtion to their needs, so all individuals do equally well |
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Definition
| the observed large discrepency between the rapid rate of movement of trees recolonizing areas at the end of he Ice Age and the observed slow dispersal rate of tree seeds spreading by diffusion; glaciers are moving faster than trees can disperse |
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Definition
| the rule of thumb that 1 species in 10 alien species improted into a country become introduced, 1 in 10 of the introduced species becomes established, and 10 in 10 of the establish species becomes a pest |
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