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How a thumb-sized climate migrant with a giant crab claw is disrupting the Northeast's Great Marsh ecosystem

  • Written by David Samuel Johnson, Associate Professor of Marine Sciences, Virginia Institute of Marine Science
How a thumb-sized climate migrant with a giant crab claw is disrupting the Northeast's Great Marsh ecosystemMale fiddler crabs are small, with one oversized claw.David S. Johnson

Nine years ago, I stood on the muddy banks of the Great Marsh, a salt marsh an hour north of Boston, and pulled a thumb-sized crab with an absurdly large claw out of a burrow. I was looking at a fiddler crab – a species that wasn’t supposed to be north of Cape Cod,...

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