For example, densities of G. demissa average 46 my2 in the mid-intertidal zone of a Spartina alterniflora Loisel salt marsh along Canary Creek, Delaware Bay, USA ŽDaiber, 1982., and Jordan and Valiela Ž1982. reported that the biomass of G. demissa in Atlantic coast marshes can outweigh that of all other metazoans.