Identification and Description of Macrobenthic Communities in the Calvert Cliffs Region of the Chesapeake Bay

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Abstract
The macrobenthos (>1.0 mm) in the Calvert Cliffs region of the Chesapeake Bay was sampled over a three year period (1971–1974). Four distinct communities (shell, 3 m sand, 6 m muddy-sand, 9 m mud) were identified and described using single-linkage cluster and discriminant analyses. Substrate characteristics were the major environmental factor controlling the spatial distribution of macrobenthic communities within the study area, and within a habitat communities were relatively homogeneous throughout the region. The structure of the 6 m muddy-sand community variously resembled the 3 m sand or the 9-m mud community depending upon season and year.

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