Ecologists put price tag on invasive species

Invasive species can disrupt natural and man-made ecosystems, throwing food webs out of balance and damaging the services they provide to humans. Now ecologists have begun to put a price tag on this damage. In a study published this week in 'Frontiers in Ecology and the Environment' e-view, ecologists have listed the invasive species that cause the most harm to environment and cost the most money to combat...

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