Plants- From Wildflowers to Longleaf PineSalt Marsh Ecology | In the Grass Are two friends better than one? by Randall August 16, 2011 by Randall August 16, 2011 Fiddler crabs benefit salt marshes. Ribbed mussels benefit salt marshes. But together, is their effect even greater, or do they cancel each other out? Dr. Randall Hughes of the FSU Coastal & Marine Lab looks to find out.