Once established, exotic species introduced into a new area often increase dramatically in numbers for quite some time. This increase is believed to occur because __________.

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    there are many vacant niches in most ecosystems that exotic species can readily fill
    they lack many of the natural enemies (predators, parasites, etc.) that would keep their numbers in check in their native range
    exotic species always have very high carrying capacities
    exotic species always have very high population growth rates (r)
    all of the above

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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they lack many of the natural enemies (predators, parasites, etc.) that would keep their numbers in check in their native range
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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