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278. 国家公园
P1 - Human: principal disperser of V. plants.
Some, accidental;
Some, deliberately.
P2 - Global dispersers can be beneficial, neutral or detrimental.
B's definition of weeds.
We deal with weeds in a new range
P3 - These species cause enormous cost.
E.g. A's and US' example
P4 - Two conclusions:
1/ most were introduced
2/ the largest single group was introduced
Implication: current under control and warn any future introductions.
P5 - In this article: Motivations, Biological basis, Predictions and Suggestions.
Begin by exploring the role of Natual forces.
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