Cape Cod, Massachusetts has a problem. The iconic salt marshes of the famous summer retreat are melting away at the edges, dying back from the most popular recreational areas. The erosion is a consequence of an unexpected synergy between recreational over-fishing and Great Depression-era ditches constructed by Works Progress Administration (WPA) in an effort to control mosquitoes. The cascade of ecological cause and effect is described by Tyler Coverdale and colleagues at Brown University in a paper published online this month in ESA’s journal Frontiers in Ecology and the Environment.
“People who live near the marshes complain about the die-off because it’s not nice to look at,” said Coverdale. “Without cordgrass protection you also get really significant erosion, retreating at sometimes over a meter a year.” The die-back is ugly, but it is also a substantial loss of a valuable ecological resource.
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