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How Do Invasive Plant Species Dominate Native Species?
A common, but rarely tested assumption to why invasive plant species dominate native species is that that these plants are more abundant in introduced versus native communities, because they are behaving in special way. If this true and introduced species are behaving in a special way it means biosecurity screening procedures need to speculate on how species will behave once introduced, a very difficult task to get right.

A global collaboration called the Nutrient Network tested this 'abundance assumption' for 26 herbaceous species at 39 sites on four continents in a recent publication in the journal Ecology Letters. The lead author of 36, Jennifer Firn from the Queensland University of Technology and CSIRO, Australia found that the 'abundance assumption' did not hold for the majority of species with 20 of the 26 species examined having either a similar or lower abundance at introduced versus native sites.

 
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New Arctic Shipping Lanes Could Leave them Open to Invasive Species Spread - Experts are warning that the new Arctic shipping routes that have opened up as ice-ways continue to melt create new opportunities for invasive marine and insect life to spread further north.


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