FISH 423 Lecture Notes - Lecture 2: Introduced Species, Ornamental Plant, Biological Pest Control
21 Jan 2021
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Document Summary
Pictures from lecture slides on class canvas website. Invasion sequence can be portrayed as a series of barriers or filters. 1 in 10 imported plant or animal species (brought into the country) appear in the wild. 1 in 10 of those species develop a self-sustaining population. 1 in 10 of established species are invasive (i. e. , negative economic effect) Pathways: there are many (and multiple) pathways, vectors and routes of species introductions, the relative importance of different pathways vary in three important dimensions, intentional vs. unintentional introductions. Introduced species are either the object or "passengers" of traded goods. Most non-native species arrive in new locations as result of trade. Difficult to protect national borders due to minimal legal responsibility. Invasion costs are an unintended side effect of international trade. More than 90% global trade via sea. Ocean vessels need proper stability to minimize drag and capsizing. Used to be achieved by filling ballast compartments within the hull with soil, rocks, metal.
