. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYSIOLOGICAL ECOLOGY AND BEHAVIOR Reference: Biol. Bull. 189: 235-236. (October/November. 1995) 235 Accumulation of Dimethylsulfoniopropionate in Geukensia demissa Depends on Trophic Interactions Bradley A. White (Department of'/.oology, Michigan State University, East Lansing, MI 48824), Richard IT. /////. and John \V. H. Dacev Dimethyl sulfide (DMS) constitutes up to half of the atmo- spheric sulfur produced biogenically (1,2) and may affect global climate (3). A major source of atmospheric DMS is the enzymatic cleavage o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PHYSIOLOGICAL ECOLOGY AND BEHAVIOR Reference: Biol. Bull. 189: 235-236. (October/November. 1995) 235 Accumulation of Dimethylsulfoniopropionate in Geukensia demissa Depends on Trophic Interactions Bradley A. White (Department of'/.oology, Michigan State University, East Lansing, MI 48824), Richard IT. /////. and John \V. H. Dacev Dimethyl sulfide (DMS) constitutes up to half of the atmo- spheric sulfur produced biogenically (1,2) and may affect global climate (3). A major source of atmospheric DMS is the enzymatic cleavage of dimethylsulfoniopropionate (DMSP), which is syn- thesized by many phytoplankters (4. 5) and a few vascular plants, including Sptinimi aherniflora (5). Most DMSP is released fol- lowing rupture of cell walls (6. 7) and is then subject to microbial degradation to DMS (8, 9). Little attention has been given to salt marsh DMSP fluxes outside the autotrophic and microbial components of the food web. The purpose of this study was to explore DMSP pathways within the Great Sippewissett Marsh (Falmouth. Massachusetts), determining in particular whether tissue concentrations of DMSP in Genkciisui demissa vary with food resources. G demissa, the ribbed mussel, is the dominant animal in salt marshes in the eastern United States (10). Ribbed mussels in the Great Sippe- wissett Marsh filter most of the marsh water during each tidal cycle (11) and thus are likely to play a key role in marsh DMSP fluxes. (J demissa can directly consume S. aherniflora detritus in addition to plankton and bacteria (12). Peterson el al. showed that the isotopic composition of G. demissa in the Great Sip- pewissett Marsh follows a horizontal gradient reflecting a shift in available food resources, from a diet high in phytoplankton (up to 70%) near the bay. to mostly Spartina detritus (80%) in the marsh interior (13). Delta values for 34S isotope indicate that much of this shift occurs in a relatively short regio
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
