Biogeographic Evaluation
| Stage | Characteristic |
|---|---|
| 0 | Propagules residing in a donor region |
| I | Traveling |
| II | Introduced |
| III | Localized and numerically rare |
| IVa | Widespread but rare |
| IVb | Localized but dominant |
| V | Widespread and dominant |
In an attempt to avoid the ambiguous, subjective, and pejorative vocabulary that so often accompanies discussion of invasive species even in scientific papers, Colautti and MacIsaac proposed a new nomenclature system based on biogeography rather than on taxa.
By discarding taxonomy, human health, and economic factors, this model focused only on ecological factors. The model evaluated individual populations rather than entire species. It classified each population based on its success in that environment. This model applied equally to indigenous and to introduced species, and did not automatically categorize successful introductions as harmful.
Read more about this topic: Invasive Species
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