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Comparably sized deep-sea scallops Placopecten rnageLlanicus from 2 offshore sites in the Gulf of Maine. USA (Fippennies Ledge and Jeffreys Ledge) had significantly lower adductor muscle wet weights, digestive gland wet weights, and digestive gland lipid contents and concentrations than scallops collected from a coastal site in Maine (Ram Island). Scallops transplanted from Ram Island to Fippennies Ledge for 1 yr showed no differences from the indigenous Fippennies Ledge scallops in mean adductor wet weights, digestive gland wet weights, lipid contents and concentrations, or the contents and concentrations of chlorophyllous pigments stored in the digestive gland. Pigment analysis of stomach and intestinal contents, while reflecting recent ingestion, did not display a consistent pattern from one year to the next, and was therefore of little value for comparing nutritional histories between scallop populations. Phaeophorbide a was the primary breakdown product of chlorophyll a, identified in acetone extracts of stomach contents, intestinal material, and digestive gland tissues by reverse phase high performance liquid chromatography (RP-HPLC). Low concentrations of chlorophyll a, phaeophytin a, chlorophyllide a and phaeophorbide c were also identified in digestive gland and ingested material extracts using HPLC. Numerous unidentified chromatographic peaks were present as well. The absorption and storage of chlorophyllous pigments in digestive gland tissues mimicked the pattern of abundance measured in the stomach and intestinal contents. Offshore scallops collected in 1986 and 1987 stored more phaeopigments in digestive gland tissues than inshore scallops. Digestive gland phaeopigment concentrations varied independently of both lipid stores and digestive gland wet weights, and were therefore poor indices of long-term nutritional history. hp id content, however, was directly correlated with digestive gland wet weight.

Chlorophyllous pigment and lipid stores in the digestive glands of inshore and offshore populations of the deep-sea scallop Placopecten magellanicus