Abstract
ABSTRACT As a result of insufficient sampling, differences in estuarine attributes, species variation, and poor links to anthropogenic sources, responses of bivalve mollucs to anthropogenic nutrient enrichment of coastal waters remains poorly defined for most systems worldwide. To establish the net effect of nutrient enrichment on bivalves, we compared changes in growth and survival of different bivalve species reported in 5 studies conducted in a representative estuarine system (on Cape Cod, MA) in which effects of eutrophication on food supply and habitat were quantified and related directly to land-derived nitrogen (N) sources. N-stable isotope ratios in suspended particulates and bivalve tissues demonstrated that N derived from anthropogenic wastewater was assimilated into bivalve tissues as N loads increased. Bivalve shell and soft-tissue growth also increased in response to increased chlorophyll a concentrations driven by land-derived N loads. Growth was accompanied by increased percent N content of...
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