Researchers Find Bright Sides to Some Invasive Species
(World News Science)

Off the shores of Newfoundland, Canada, an ecosystem is unraveling at the hands (or pincers) of an invasive crab. Some 1,500 kilometers (930 miles) to the south, the same invasive crab - the European green crab - is helping New England marshes rebuild. Both cases are featured in a new study that shows how the impacts of these alien invaders are not always straightforward. Around the world, invasive species are a major threat to many coastal ecosystems and the benefits they provide, from food to clean water. Attitudes among scientists are evolving, however, as more research demonstrates that they occasionally carry a hidden upside. `It`s complicated,` said...