. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY: SEDIMENT PROCESSES 289 iment layers, releases from the intact sediment should equal the sum of nutrient release from the oxic and anoxic sections. How- ever, as the data show, the release of nutrients from intact sed- iment is reduced by interactions between the two layers. At the end of the experiment, the control cores released only 38% of the phosphate and 77% of the total inorganic nitrogen that was released from the sum of the separated oxic and anoxic sections. This research was supported by an LMER grant (NSF
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY: SEDIMENT PROCESSES 289 iment layers, releases from the intact sediment should equal the sum of nutrient release from the oxic and anoxic sections. How- ever, as the data show, the release of nutrients from intact sed- iment is reduced by interactions between the two layers. At the end of the experiment, the control cores released only 38% of the phosphate and 77% of the total inorganic nitrogen that was released from the sum of the separated oxic and anoxic sections. This research was supported by an LMER grant (NSF-OCE- 9214461). Thanks to Ishi Buffam. Dave Giehtbrock, Chuck Hopkinson. Kathy Regan, and Amy Uhlenhopp for advice and assistance with sample analysis. Literature Cited 1 Caraco, N., J. J. Cole, and G. E. Likens. 1991. Pp. 241-258 in Comparative Analyses of Ecosystems- Cole, Lovett, and Findlay, eds. Springer Verlag, New York. 2. Klump, V. J., and C. S. Martens. 1983. Pp. 411-457 in Nitrogen in the Marine Environment. Carpenter and Capone, eds. Academic Press, New York. Reference: Biol. Bull. 187: 289-290. (October, 1994) Rate of Denitrification in Submerged Salt Marsh Sediments Rachel Johnson, Michael LaMontagne. and Ivan I 'aliela (Boston University Marine Program, Marine Biological Laboratory) Denitrification, a microbial process in which nitrate is con- verted to NT gas, may provide a significant nitrogen sink in salt marsh ecosystems. Salt marshes are located on a fringe between coastal watersheds and receiving estuaries, so that denitrification in marshes may lower nitrogen loading from the watershed to the receiving estuary. To measure rates of denitrification in salt marshes, sediment cores were collected from marsh sites covered by Spartina al- lernijlora in Sage Lot Pond, an estuary of Waquoit Bay, Mas- sachussetts. Cores were sampled five times over a period of in- creasing temperatures from 10 June to 1 August 1994. We also measured N2 flux in another estuary of Waq
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