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  • A species may eat a particular bacterium, phytoplankton, smaller fish, or plant in an area. Lacking a predator, these species/populations will overgrow and alter the area's biology, overwhelming and driving to extinction dozens or hundreds or thousands of other local species.

    "Threshold: The Progressive Plan to Pull America Back from the Brink". Book by Thom Hartmann, p.22, mindprod.com. July 23, 2009.