Caption A mosquito ditch draining a small pond in a Cape Cod salt marsh, at a healthy site in 2010. This ditch was constructed in the 1930s and has not widened since its construction, but has been ...

The native species, the purple marsh crab, feeds on cordgrass. In recent years, overfishing has depleted the crab’s predators. As purple marsh crab populations have soared, they’ve eaten increasing ...

Salt marshes are grasslands flooded daily by the sea. Imagine a Midwest prairie as oceanfront property. South of Cape Cod, decades of research has shown that when fiddler crabs are present ...