A young green crab, photo Wikipedia.

Science Daily: Long vilified, invasive species can sometimes become an ecosystem asset. New Brown University research published online in the journal Ecology reports exactly such a situation in the distressed salt marshes of Cape Cod. There, the invasive green crab Carcinus maenas is helping to restore the marsh by driving away the Sesarma reticulatum crabs that have been depleting the marsh grasses.

The observations and experiments of the research show that the green crab has filled the void left by the decline of native predators of sesarma crabs, the authors said. In previous research they showed that predator decline has come about because of recreational fishing.

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