Abstract
Growth rates of suspension-feeding ribbed mussels were studied by putting out two sizes of identically constituted mussel clumps as well as single mussels at different locations in the salt marsh. Growth rates of mussels among singletons and two clump sizes were similar, suggesting that food concentration was not a limiting factor. At one of the two marshes studied, the magnitude of differences in growth rates of mussels from low to high tidal elevations is larger than would be predicted by the differences in time of submergence. At similar tidal elevations, mussels from the interior of the marsh grew at similar rates to those from the marsh edge. At the other marsh, however, individuals from the interior grew substantially faster than their counterparts from the edge at similar tidal elevations. I hypothesize that mussels from the interior of the marsh had an additional food source because Spartina detritus can contribute to food supplies in the interior.
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