Arrival 2 establishment 3 spread 13 1 arrival

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Unformatted text preview: rowth/maturation Able to reproduce early Rapid reproduction Able to reproduce often High dispersal capacity Easy access to new habitats Phenotypic plasticity Better able to exploit new habitats Tolerance to wide range of environmental conditions Reduced likelihood of mortality Generalist Able to feed/grow on many different things Association with humans Catch a ride to new habitats 12 Stages of invasion 1.  Arrival 2.  Establishment 3.  Spread 13 1) Arrival   Historically inten8onal, now mostly accidental introduc8ons   Ship’s ballast   Ornamental plants o  Sucking insects, plant diseases   Wood products o  Dunnage o  Wire spools •  Wood borers 2) Establishment   Not every new invader becomes established o  Habitat to which the invader is transported requires resources for survival and reproduc8on o  Timing of invasion must be appropriate for the invader life stage o  The introduced popula8on must be sufficiently large •  More individuals, bejer invasion success  ­ Allee effect •  More introduc8on events, bejer invasion success 15 More individuals  ­ the Allee effect Normally, birth rate (b) increases as popula8ons decrease; however, in very small popula8ons, the birth rate may decline due primarily to difficul8es in mate loca8on (or inbreeding)  ...
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This document was uploaded on 03/27/2014 for the course CONS 101 at University of British Columbia.

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