Characteristics of Macoma balthica Populations in the Middle Patuxent Estuary

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Abstract
Populations ofMacoma balthica, sampled by a hydraulic dredge in the Patuxent River, were studied in respect to density and size-frequency distribution. Density varied from station to station and from one sampling period to the other in the same station, indicating spotty and localized populations. Size-frequency distributions for a given station were fairly homogeneous, excluding small sizes (below 11 mm) which can go through the meshes of the collecting gear. The average size of theMacoma decreases toward the lower section of the river where the salinity is higher.

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