. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 60 100 140 180 220 260 300 OBN • SH O -16- -17 • -19 Polychaetes. Quahogs 60 100 140 180 220 260 Prosomal width (mm) 300 Figure 1. laoiopic measurements of samples collected in Barnstahle Haihor (BN), Stage Harbor (SH). and Pleasant Bay (PB>. Cape Cod, Massachusetts, (a) S'*N and S"C signatures of horseshoe t rah and other components of the estuary' system of BN and SH. The dashed ovals include measurements taken in BN and the three other sites within SH (Main Bay, sources supported by the phytoplunkton-based portion
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 60 100 140 180 220 260 300 OBN • SH O -16- -17 • -19 Polychaetes. Quahogs 60 100 140 180 220 260 Prosomal width (mm) 300 Figure 1. laoiopic measurements of samples collected in Barnstahle Haihor (BN), Stage Harbor (SH). and Pleasant Bay (PB>. Cape Cod, Massachusetts, (a) S'*N and S"C signatures of horseshoe t rah and other components of the estuary' system of BN and SH. The dashed ovals include measurements taken in BN and the three other sites within SH (Main Bay, sources supported by the phytoplunkton-based portion of the food web. The results of this work lend support to earlier findings about the position of horseshoe crabs as generalist predators in the estuarine food webs of Cape Cod: demonstrate that horseshoe crabs are clearly linked to land-derived nitrogen sources; suggest a possible diet shift from S/wY/mi-based food sources to more phytoplank- ton-based sources as adult crabs grow: and show that the crabs exhibit considerable within-estuary loyalty in their foraging habits. This study was supported by an internship to from the Woods Hole Marine Sciences Consortium and funding from MIT Sea Grant. We are grateful to Ed Eichner of the Cape Cod Commission for sharing information on land use, and to Mirta Teichberg. Allyson Papa, and Rachel Allen for assistance in many ways. Literature Cited 1. Carmichael, R. H., D. Rutecki. B. Annett, E. Gaines. and I. Valiela. J. Exp. Mar. Biol. Ecol. (In press). 2. Peterson, B. J., and B. Fry. 1987. Alum. Re\: Ecol. Syst. 18: 293- 320. 3 Eichner, E. M., S. C. Michaud, T. C. Cambareri, B. Smith, G. Prahm. and M. Fenn. 20(12. Cape Cod Surface Water Nutrient Management Study. Unpublished report. Water Resource Office. Cape Cod Commission, Barnstuble, MA. 4. Eichner, E. M., K. Livingston, B. Smith, V. Morill, and A. Carbon- ell. 1998. Pleasant Bav Nitrogen Loading Analysis. Unpublished re- port. Water Resource Office. Cape Cod Commission.
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
