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G natural enemies basic host plant resistance 18

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Unformatted text preview: Implica8ons to invasive species A threshold popula8on density is required for a species to persist Birth rate (b) o  Allee effect Population size (Nt) 16 More introduc8on events   South African reserves (2 habitat types)   More visitors = more introduced plants 17 3) Spread   Some factors associated with high rates of invasive species spread o  Changing land use pajern •  Ajract or expel species o  Travel and trade •  Uninten8onal spread o  Climate change •  Increase in clima8cally suitable niches o  Other factors •  Lack of natural popula8on regula8on (e.g. natural enemies, basic host plant resistance) 18 Invasive species management Strategies: preven8on of arrival, establishment, spread Phase Tac8c (general) Arrival Inspec8on, quaran8ne Establishment Detec8on & eradica8on Spread Barrier zones 19 IPPC and CFIA: policies against invasive species   Interna8onal Plant Protec8on Conven8on o  Signed 1997 o  hjps://www.ippc.int/IPP/En/default.jsp   Canadian Food Inspec8on Agency, Plant Products Directorate, Plant Health Division o  hjp://www.inspec8on.gc.ca/english/plaveg/heaproe.shtml European starling   Eugene Scheifflin 1890 ­91 o  “American Acclima8za8on Society” for European sejlers o  Introduced 100 birds into Central Park, New York City o...
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