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New Zealand's invasive ants mysteriously vanish http://apocadocs.com/s.pl?1322665157
If only all ecological pests were so easily dispatched. The Argentine ant (Linepithema humile), one of the world's worst invasive species, is disappearing from New Zealand - without any human intervention.
The alien ant arrived in New Zealand in 1990 and has since marched across the nation's two main islands....
Perhaps no longer. Phil Lester and colleagues at the Victoria University of Wellington say that alien ant colonies in 60 locations are collapsing on their own. Lester thinks low genetic diversity, which is associated with reduced disease resistance, is the most likely reason for the ant's demise.
... [O]ther alien species won't be so easily dealt with. "For thousands of other invasive species around the world we've seen no such collapse," she says.
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[Read more stories about:
invasive species, weakened immunity]
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'Doc Jim says:
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This invasive army may have just declared victory, and gone home.
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