Joye CV

Samantha B. Joye
Department of Marine Sciences
The University of Georgia
Room 220 Marine Sciences Bldg.
Athens, Georgia 3060-3636
Phone: (706) 542-5893
Fax: (706) 542-5888
Email: mjoye@uga.edu

1993 Ph. D. Marine Sciences University of North Carolina at Chapel Hill (Biogeochemistry)

1989 M. Sc. Marine Sciences University of North Carolina at Chapel Hill (Geochemistry)

2002-2003 Visiting Professor Max Planck Institute for Marine Microbiology
Bremen, Germany

2001-2005 Associate Professor The University of Georgia
Department of Marine Sciences

1997-2001 Assistant Professor The University of Georgia
Department of Marine Sciences

1995-1997 Assistant Professor Texas A & M University
Department of Oceanography

1993-1995 Research Associate San Francisco State University
Center for Environmental Studies

69. Porubsky, W. P., N. B. Weston, and S. B. Joye (in review) Interactions between benthic primary production, denitrification and dissimilatory nitrate reduction to ammonium in intertidal sediments. Estuarine Coastal and Shelf Science.

68. Porubsky, W. P., L. Velasquez, and S. B. Joye (in review) Nutrient replete benthic microalgae as a source of labile dissolved organic carbon to coastal waters. Estuaries and Coasts.

67. Orcutt, B. N., J. S. Lipp, K. Knittel, K.-U. Hinrichs, S. B. Joye, and A. Boetius (in revision). Microbial community composition and activity in hydrate-bearing deep subsurface sediments of Hydrate Ridge (Cascadia Margin, ODP Leg 204). Geochimica et Cosmochimica Acta.

66. Carini, S. A., and S. B. Joye (in review) Nitrification in Mono Lake, California (USA): Activity and community composition during contrasting hydrological regimes. Limnology and Oceanography.

65. Craft, C., J. Clough, J. Ehman, H. Guo, S. Joye, M. Machmuller, D. Park, and S. Pennings (in review). Effects of accelerated sea level rise on ecosystem services provided by tidal marshes: A simulation of the Georgia (Coast). Frontiers in Ecology and Environment.

64. Krüger, M., H. Wolters, M. Gehre, S. B. Joye, and H.-H. Richnow (2008) Tracing the slow growth of anaerobic methane oxidizing communities by 15N-labeling techniques. FEMS Microbiology Ecology, in press.

63. Orcutt, B. N., V. Samarkin, A. Boetius and S. B. Joye (2008) On the relationship between methane production and oxidation by anaerobic methanotrophic communities from cold seeps of the Gulf of Mexico. Environmental Microbiology, in press.

62. Lee, R. Y., W. P. Porubsky, I. C. Feller, K. L. McKee and S. B. Joye (2008) Porewater biogeochemistry and soil metabolism in dwarf red mangrove habitats (Twin Cays, Belize). Biogeochemistry, in press.

61. Edmonds, J. W., N. B. Weston, S. B. Joye and M. A. Moran (2008) Variation in prokaryotic community composition as a function of resource availability in tidal creek sediments. Applied and Environmental Microbiology, in press.

60. Joye, S. B. and I. Anderson, 2007. Nitrogen cycling in Estuarine and Nearshore Sediments. In: Capone, D., Bronk, D., Carpenter, E. and Mulhollond, M. (Eds), Nitrogen in the Marine Environment, Springer Verlag, in press.

59. Joye, S. B., P. Cook, and D. de Beer (2007) The Biogeochemistry of Tidal Flats. In: Perillo, G. M. E., E. Wolanski, D. Cahoon, and M. Brinson (Eds), Coastal Wetlands: An Integrated Ecosystem Approach, Elsevier, in press.

58. Howard, E. C., J. R. Henricksen, A. Buchan, C. R. Reisch, B. Burgmann, R. Welsh, W. Ye, J. M. Gonzalez, K. Mace, S. B. Joye, R. P. Keine, W. B. Whitman, and M. A. Moran (2006) Bacterial taxa that limit sulfur flux from the ocean. Science, 314: 649-652.

57. Kniemeyer, O., F. Musat, S. M. Sievert, K. Knittel, H. Wilkes, M. Blumenberg, W. Michaelis, A. Classen, C. Bolm, S. B. Joye, and F. Widdel (2007) Anaerobic oxidation of propane and ethane by novel marine sulphate-reducing bacteria. Nature, 10.1038/nature06200.

56. Roberts, H. H., C. Fisher, B. Bernard, J. Brooks, M. Bright, R. Carney, E. Cordes, S. Hourdez, J. Hunt, S. Joye, I. MacDonald, C. Morrison, K. Nelson, V. Samarkin, W. Shedd, E. Becker, M. Bernier, M. Bowles, L. Goehring, M. Kupehik, S. Lessard-Pilon, H. Niemann, C. Petersen, J. Petersen, J. Potter, and G. Telesnicki (2007) ALVIN Explores the Deep Northern Gulf of Mexico Slope. EOS Transactions of the American Geophysical Union, 88: 341-342.

55. Bailey, J. V., S. B. Joye, K. M. Kalanetra, B. E. Flood, and F. A. Corsetti (2007) Palaeontology: Undressing and redressing Ediacaran embryos. Nature 446, E10 - E11 (reply to a comment).

54. Bailey, J. V., S. B. Joye, K. M. Kalanetra, B. E. Flood, and F. A. Corsetti (2007) Evidence for giant sulfur bacteria in Neoproterozoic phosphorites. Nature, 445: 198-201.

53. Niemann, H., M. Elvert, E. Damm, , J. Gutt, B. Orcutt, I. Suck, G. Wendt, J. Wunderlich, S. B. Joye, K. Finster, and A. Boetius (2006). Methane emission and consumption at a North Sea pockmark (Tommeliten area). Biogeosciences, 2: 335-351.

52. Smith, V., S. B. Joye and R. W. Howarth (2006). Eutrophication in aquatic ecosystems. Limnology and Oceanography, 51(1): 351-355.

51. Weston, N. B., R. Dixon, and S. B. Joye (2006). Ramifications of Salinity Intrusion into Tidal Freshwater Sediments: Geochemistry and Microbial Pathways of Organic Matter Mineralization. Journal of Geophysical Research, 111, G01009, doi: 10.1029/2005JG000071.

50. Nercessian, O., M. G. Kalyuzhnaya, S. B. Joye, M. E. Lidstrom, and L. Chistoserdova (2006). Analysis of fae and fhcD genes in Mono Lake, California. Applied and Environmental Microbiology, 71: 8949-8953.

49. Moore, W. S., J. Blanton, and S. B. Joye (2006) Estimates of flushing times, submarine groundwater discharge, and nutrient fluxes to Okatee Estuary, South Carolina . Journal of Geophysical Research , Vol. 111, No. C9, C09006, 10.1029/2005JC003041

48. Weston, N. B., and S. B. Joye (2005). Temperature driven accumulation of labile, dissolved organic matter in anoxic marine sediments. Proceedings of the National Academy of Sciences (U.S.A.), 102: 17036-17040.

47. Lee, R. Y., and S. B. Joye (2006). Patterns and controls on nitrogen fixation and denitrification in intertidal sediments of a tropical oceanic mangrove island. Marine Ecology Progress Series, 307: 127-141.

46. Joye, S.B., I. R. MacDonald, J. P. Montoya, and M. Peccini, 2005. Geophysical and geochemical signatures of Gulf of Mexico seafloor brines. Biogeosciences, 2: 295-309.

45. Orcutt, B. N., A. Boetius, M. Elvert, V. Samarkin, and S. B. Joye,(2005) Molecular biogeochemistry of sulfate reduction, methanogenesis and the anaerobic oxidation of methane at Gulf of Mexico methane seeps. Geochimica et Cosmochimica, Acta 69(17): 4267-4281.

44. Lin, J.-L., S. B. Joye, H. Schafer, J. C. M. Scholten, I. R. McDonald, and J. C. Murrell (2005) Diversity of methanotrophs in Mono Lake, a meromictic soda lake in California. Applied and Environmental Microbiology, 71: 6458-6462.

43. Kalanetra, K. M., S. B. Joye, N. R. Sunseri, and D. C. Nelson (2005) Novel, large, vacuolate, nitrate-accumulating sulfur bacteria discovered in the Gulf of Mexico reproduce by reductive division in three dimensions. Environmental Microbiology, 7(9): 1451-1460.

42. Malgalhaes, C. M., S. B. Joye, R. M. Moreira, W. J. Wiebe, and A. A. Bordalo (2005) Salinity and inorganic nitrogen effects on nitrification and denitrification rates in intertidal sediments and rocky biofilms: Douro River estuary, Portugal. Water Research 39(9): 1783-1794.

41. Weston, N. B., W. P. Porubsky, M. Erickson, V. Samarkin, S. MacAvoy and S. B. Joye,(2006) Pore water stoichiometry of dissolved organic matter and inorganic redox metobolites in intertidal systems. Biogeochemistry 77: 375-408.

40. Malgalhaes, C. M., W. J. Wiebe, S. B. Joye and A. A. Bordalo (2005) Nitrogen Cycle Dynamics and Processes in Intertidal Rocky Biofilms and Adjacent Sediment of the Douro River Estuary (Portugal). Estuaries. 28(4): 592-607.

39. Hollibaugh, J. T., S. Carini, R. Jellison, S. B. Joye, G. LeCleir, C. Meile, L. Vasquez, H. Gurleyuk, and D. Wallschlager, in press. Distribution of arsenic species in an alkaline, hypersaline, meromictic lake in response to the seasonal stratification. Geochim. Cosmochim. Acta 69(8): 1925-1937. Acta, 2005.

38. Carini, S. A., G. LeCleir, N. Bano, and S. B. Joye (2005) Activity, abundance and diversity of aerobic methanotrophs in an alkaline, hypersaline lake (Mono Lake, CA, USA). Environmental Microbiology, 7(8): 1127-1138.

37. Joye, S. B. , D. A. Bronk, D. Koopmans, & W. S. Moore, 2006. Potential for groundwater-derived carbon, nitrogen and phosphorus inputs to coastal ecosystems in South Carolina and Georgia , pp. 139-167. In: Kleppel, G.S., M.R. DeVoe, & M. Rawson (Eds.), Implications of Land Use Change to Coastal Ecosystems . Springer Verlag, New York .

36. Scholten, J. C. M., S. B. Joye, J. T. Hollibaugh, and C. Murrell (2005) Molecular analysis of the sulfate reducing and methanogenic community in a meromictic lake (Mono Lake, California) by targeting 16SrRNA, Methyl CoM-, APS- and DSR- genes. Microbial Ecology, 50: 29-39.

35. Joye, S. B. and R. Y. Lee (2005) Benthic microbial mats: important sources of fixed nitrogen and carbon to the Twin Cays, Belize ecosystem. Atoll Res. Bull. 528: 1925-1937.

34. Weston, N. B., J. T. Hollibaugh, J. Sandow, and S. B. Joye (2005) Nutrients and dissolved organic matter in the Altamaha River and loading to the coastal zone. In: Proceedings of the 2002 Georgia Water Research Conference.

33. Arvidson, R., J. W. Morse, and S. B. Joye (2004) The Sedimentary Biogeochemistry of Chemosynthetic Cold Seep Communities, Gulf of Mexico, USA, Marine Chemistry 87: 97-119.

32. Orcutt, B. N., A. Boetius, S. K. Lugo, I. R. MacDonald, V. Samarkin, and S. B. Joye (2004) Life at the edge of methane ice: methane and sulfur cycling in Gulf of Mexico gas hydrates. Chemical Geology 205(3/4): 239-251.

31. Joye, S. B., A. Boetius, B. N. Orcutt, J. P. Montoya, H. N. Schulz, M. J. Erickson, and S. K. Lugo (2004) The anaerobic oxidation of methane and sulfate reduction in sediments from Gulf of Mexico cold seeps. Chemical Geology 205(3/4): 219-238.

30. Joye, S. B., W. P. Porubsky, N. B. Weston, and R. Y. Lee (2003) Benthic microalgal production and nutrient dynamics in intertidal sediments. In: Rullkštter, JŸrgen (Ed.), BioGeoChemistry of Tidal Flats, Forschungszentrum Terramare Berichte Nr. 12, Proceedings of a Workshop held at the Hanse Institute of Advanced Study, Delmenhorst, Germany, May 14-17 2003, ISSN 1432-797X, pp. 67-70.

29. Joye, S. B. (2003) (Editor-in-Chief) "Molecular Biogeochemistry" Geomicrobiology Journal, August 2003.

28. Carini, S. A., B. N. Orcutt, and S. B. Joye (2003) Interactions between nitrification and methane oxidation in estuarine sediments. Geomicrobiology Journal 20(4): 355-374.

27. Moore, W. S., J. Krest, G. Taylor, E. Roggenstein, S. B. Joye, and R. Y. Lee (2002) Thermal evidence of water exchange through a coastal aquifer: Implications for nutrient fluxes. Geophysical Research Letters 10: 1029/2002GL014923, 31 July 2002.

26. Sun, M. Y., W. J. Cai, S. B. Joye, H. Ding, J. Dai, and J. T. Hollibaugh (2002) Degradation of algal lipids in microcosm sediments with different mixing regimes. Organic Geochemistry 33: 445-459.

25. MacAvoy, S. E., S. A. Macko, and S. B. Joye (2002) Fatty acid carbon isotope signatures in chemosynthetic mussels and tube worms from Gulf of Mexico hydrocarbon seep communities. Chemical Geology 185: 1-8.

24. Joye, S. B. (2002) Denitrification in the Marine Environment. In: Encyclopedia of Environmental Microbiology, G. Collins (Ed.), John Wiley & Sons, Inc., New York, pp. 1010-1019.

23. An, S. and S. B. Joye (2001) Enhancement of coupled denitrification by benthic photosynthesis in shallow subtidal estuarine sediments. Limnology and Oceanography 46: 62-74.

22. Gonzalez, J., R. P. Kiene, S. B. Joye, D. Y. Sorokin, and M. A. Moran (2001) Oxidation of organic and inorganic sulfur compounds by aerobic heterotrophic marine bacteria. In: Singh, V. P. (Ed.) Biotranformations: Bioremediation Technology for Health and Environmental Protection, pp. 291-310. Elsevier Science Publishers. Amsterdam, the Netherlands.

21. Valiela, I., M. L. Cole, J. McClelland, J. Hauxwell, J. Cebrian, and S. B. Joye (2001) Role of salt marshes as part of coastal landscapes. In, M. P. Weinstein, D. A. Kreeger, (Eds.), Concepts and Controversies in Tidal Ecology, pp. 23-38, Klewer Academic Publishers. Dordrecht, The Netherlands.

20. Ward, B. B., D. Martino, C. Diaz, and S. B. Joye (2000) Analysis of ammonia-oxidizing bacteria from hypersaline Mono Lake, California on the basis of 16S rRNA sequences. Applied Environmental Microbiology 66(7): 2873-2881.

19. Fisher, C. R., I. R. MacDonald, R. Sassen, C. M. Young, S. A. Macko, S. Hourdez, R. S. Carney, S. B. Joye and E. McMullin (2000) Methane ice worms: Hesiocaeca methanicola colonizing fossil fuel reserves. Naturwissenschaften 87(4): 184-187.

18. Joye, S. B., R. Wisniewski and S. An (1999) Interactions between the nitrogen, carbon and oxygen cycles in shallow coastal sediments, pp. 49-53. In: Armannsson, H. (Ed.) Geochemistry of the Earth's Surface. Balkema Press, Iceland.

17. Joye, S. B., T. M. Connell, L. G. Miller, and R. S. Oremland (1999) Oxidation of ammonia and methane in an alkaline, saline lake. Limnology and Oceanography 44(1): 178-188.

16. Sassen, R., S. B. Joye, S. T. Sweet, D. A. Defrietas, A. V. Milkov, and I. R. MacDonald (1999) Thermogenic gas hydrates and hydrocarbon gases in complex chemosynthetic communities, Gulf of Mexico, Continental Slope. Organic Geochemistry 30: 485-497.

15. Mayer, L. M., R. G. Keil, S. A. Macko, S. B. Joye, K. C. Ruttenberg, and R. C. Aller (1998) The importance of suspended particulates in riverine delivery of bioavailable nitrogen to coastal zones. Global Biogeochemical Cycles 12: 573-580.

14. Sassen, R., I. R. MacDonald, N. L. Guinasso, S. B. Joye, A. G. Requejo, S. T. Sweet, J. Alcala-Herrera, D. A. DeFrietas, and D. R. Schink (1998) Bacterial methane oxidation in sea-floor gas hydrate: Significance to life in extreme environments. Geology 26: 851-854.

13. An, S., and S. B. Joye (1997) An improved gas chromatographic method for measuring nitrogen, oxygen, argon and methane in gas or liquid samples. Marine Chemistry 59 (1,2): 63-70.

12. Connell, T., S. B. Joye, L. G. Miller and R. S. Oremland (1997) Bacterial oxidation of methyl bromide in Mono Lake, California. Environmental Science and Technology 31: 1489-1495.

11. Lee, R., S. B. Joye, B. Roberts, and I. Valiela (1997) Release of N₂ and N₂O from salt marsh sediments subject to different land-derived N loads. The Biological Bulletin 193: 292-293.

10. Joye, S. B., S. V. Smith, J. T. Hollibaugh and H. W. Paerl (1996) Estimating denitrification in estuarine sediments: comparisons of stoichiometric and acetylene based methods. Biogeochemistry 33: 197-215.

9. Joye, S. B., M. L. Mazzotta, and J. T. Hollibaugh (1996) Community metabolism in intertidal microbial mats: the importance of iron and manganese reduction. Estuarine Coastal Shelf Science 43: 747-766.

8. Currin, C. A., S. B. Joye and H. W. Paerl (1996) Nitrogen fixation and denitrification in a transplanted Spartina marsh: Implications for nitrogen budgets. Estuarine Coastal Shelf Science 42: 597-616.

7. Joye, S. B. and J. T. Hollibaugh (1995) Sulfide inhibition of nitrification influences nitrogen regeneration in sediments. Science 270: 623-625.

6. Joye, S. B. and H. W. Paerl (1994) Nitrogen cycling in marine microbial mats: Rates and patterns of nitrogen fixation and denitrification. Marine Biology 119: 285-295.

5. Sansone, F. J., J. T. Hollibaugh, S. M. Vink, R. M. Chambers, S. B. Joye, and B. N. Popp (1994) Diver-operated piston corer for nearshore use. Estuaries 17: 716-720.

4. Joye, S. B. and H. W. Paerl (1993) Nitrogen fixation and denitrification in the intertidal and subtidal sediments of Tomales Bay, California, pp. 633-653. In: R. S. Oremland (Ed.) Biogeochemistry of Global Change: Radiative Trace Gases. Chapman & Hall, New York.

3. Joye, S. B. and H. W. Paerl (1993) Contemporaneous nitrogen fixation and denitrification in marine microbial mats: Rapid response to runoff events. Marine Ecology Progress Series 94: 267-274.

2. Paerl, H. W., S. B. Joye, and M. W. Fitzpatrick (1993) An evaluation of nutrient limitation of carbon and nitrogen fixation in marine microbial mats. Marine Ecology Progress Series 105: 23-36.

1. Paerl, H. W., B. M. Bebout, S. B. Joye, and D. J. Des Marias (1993) Microscale characterization of dissolved organic matter production and uptake in marine microbial mat communities. Limnology and Oceanography 38: 1150-1161.

12. Morse, J. W., R. Arvidson, S. B. Joye and S. Macko (2000) Inorganic biogeochemistry of cold seep sediments. Final Report to the Minerals Management Service, 67 pages.

11. Morse, J. W., R. Arvidson, S. B. Joye, S. P. Escorcia, C. Cooper, J. Morin, L. Cifuentes, E. Grossman and S. Macko (1999) Inorganic biogeochemistry of cold seep sediments, Minerals Management Service, Information Transfer Meeting, Extended abstract and summary of progress to date, 10 pages.

10. Joye, S. B. (1999) Review of Biological and Environmental Chemistry of DMSP and related sulfonium compounds (Kiene, R. P., P. T. Visscher, M. D. Keller and G. O. Kirst [Eds]). Limnol. Oceanogr. 44(7): 1845.

9. Joye, S. B. and S. An (1999) Denitrification in Galveston Bay. Final Technical Report to the Texas Water Development Board. 97 pages.

8. Joye, S. B. and S. An (1998) Denitrification in Galveston Bay. Texas Water Development Board, 1997 Technical Report, 79 pages.

7. Joye, S. B., D. A. Bronk, W.-J. Cai, and W. S. Moore (1998) The influence of land use on groundwater derived nutrients and organic inputs to the South Atlantic Bight. NOAA Sea Grant, Technical Report, 38 pages.

6. MacDonald, I. R. and Joye, S. B. (1997) Lair of the "Ice Worm". Quarterdeck, 5(3): 4-8 (the Quarterdeck is published by the Oceanography Department at Texas A&M University).

5. Joye, S. B. and S. An. (1997) Denitrification in Galveston Bay. Texas Water Development Board, 1996 Technical Report, 56 pages.

4. Joye, S. B. (1997) Bess B. Ward receives 1997 G. Evelyn Hutchinson Award. American Society of Limnology and Oceanography Bulletin. 6(2), Summer.

3. Joye, S. B. and G. A. Jackson (1996) Deborah A. Bronk receives 1996 Raymond L. Lindeman Award. American Society of Limnology and Oceanography Bulletin. 5(2), Summer.

2. Joye, S. B. (1993) Spatial and temporal patterns of nitrogen fixation and denitrification in the intertidal and subtidal sediments of a Mediterranean-type estuary: Tomales Bay, California. Ph.D. Dissertation, University of North Carolina at Chapel Hill, 227 pp.

1. Joye, S. B. (1989) A laboratory model examining the precipitation of submarine (carbonate) cements. M. Sc. Thesis, University of North Carolina at Chapel Hill, 146 pp.

1994 Invited Attendee, Dissertations Initiative for the Advancement of Limnology and Oceanography

1997 Cronin Award Recipient, Estuarine Research Federation Award Recognizing Outstanding Performance by an Early Career Estuarine Scientist

2002 Sabbatical Research Fellowship, Hanse Institute for Advanced Study, Delmenhorst, Germany

Expert Panelist: Workshop on Nitrification and Denitrification, Estuarine Research Federation Annual Meeting.

Organizer (with D. Bronk): Graduate student poster competition at the ASLO/ESA summer meeting.

Discussion Leader: NSF workshop on "Ocean Ecology: Understanding and Vision for Research", Human impacts and habitat linkages group.

Invited Attendee: National Academy of Sciences First Annual Japan-America "Frontiers of Science" Symposium, Irvine, CA.

Expert Panelist: South Carolina Department of Health and Environmental Control, Special Panel to address the proposed development of a river overlay zoning district in Beaufort County, SC, Charleston, SC.

Session Chair: National Academy of Sciences Second Annual Japan-America "Frontiers of Science" Symposium, Tokyo, Japan.

Invited Session Chair: "Physical Controls on Biogeochemical Processes at the Land-Sea Interface", Estuarine Research Federation International Meeting, New Orleans, LA.

Invited Session Chair: "Molecular Biogeochemistry: Linking the distribution of bacteria to their biogeochemical function in the environment." American Society of Microbiology, Annual Meeting, Los Angeles, CA.

Session Chair: National Academy of Sciences Third Annual Japan-America "Frontiers of Science" Symposium, Irvine, CA.

Session Organizer: "Groundwater Flux at Land-Ocean Margins: Physics, Chemistry and Ecology", Hydrology Section, American Geophysical Union, Boston, MA (with C. Ruppel, lead organizer).

Invited Discussion Leader for 'hypersaline ecotypes' working group at the NSF PI workshop for Microbial Observatories and Life in Extreme Environments Programs, Arlington, VA.

Public Outreach, Chase Street Elementary School, 'What is Marine Biology?', presentation to 2nd and 3rd graders.

Special Session co-Chair: 'The History and Current Status of Eutrophication in Aquatic Ecosystems.' American Society of Limnology and Oceanography (ASLO), Aquatic Sciences Meeting, Salt Lake City, UT (with Drs. Val Smith and Bob Howarth).

Special Session co-Chair: 'Biogeochemistry, microbiology and molecular ecology of cold seeps.' ASLO Aquatic Sciences Meeting, Salt Lake City, UT (with Dr. Antje Boetius).

Special Session co-Chair: 'Methane fluxes on Earth: Budgets and Biological controls.' European Geophysical Society, American Geophysical Union, and European Union of Geophysics Joint Assembly, Nice, France (with Dr. Antje Boetius).

Organizer of a special issue of Limnology and Oceanography focusing on 'The History and Current Status of Eutrophication in Aquatic Ecosystems' (Joye, lead organizer, with V. Smith and R. Howarth, publication expected in August 2005).

Special Session co-Chair: 'Methane seeps and mud volcanoes,' European Geochemical Union Assembly, Nice, France (with Dr. Antje Boetius).

Scientific Expert at an open press conference on 'Methane seeps and mud volcanoes,' at the European Geochemical Union Assembly, Nice, France.

Invited Speaker, Gordon Research Conference on C-1 Metabolism, Mt. Holyoke College, South Hadley, MA.

Invited Speaker, American Society of Limnology and Oceanography Aquatic Sciences Meeting, Salt Lake City, Utah.

Special Session co-Chair: 'Microbial Habitats,' American Society of Limnology and Oceanography Aquatic Sciences Meeting, Salt Lake City, Utah (with Drs. Antje Boetius and Matthew Kane).

Invited Plenary Speaker, International Conference on the Biogeochemistry of Wetlands, Wetlands Biogeochemistry Institute, Baton Rouge, Lousiana.

Special Session co-Chair: 'Methane Fluxes on Continental Margins: Budgets and Biological Controls,' European Geochemical Union Assembly, Vienna, Austria (with Dr. Antje Boetius).

Invited Seminar Speaker at California Institute of Technology (Geological and Planetary Sciences Division), Morehouse College (Department of Biology), University of Delaware (College of Marine Studies) and University of South Carolina (Department of Geology)

Invited Seminar Speaker at California Institute of Technology (Environmental Sciences Division), University of Southern California (Department of Earth Sciences), and Florida State University (Department of Oceanography)

1998: Member of the Organizing Committee: American Society of Limnology and Oceanography - Ecological Society of America, Summer Meeting, St. Louis, MO.

1999: Member of the Organizing Committee: National Academy of Sciences Second Annual Japan-America "Frontiers of Science" Symposium, Tokyo, Japan.

2000: Co-Chair of the Organizing Committee: National Academy of Sciences Third Annual Japan-America "Frontiers of Science" Symposium, Irvine, CA.

2003: Chair of the Organizing Committee: American Society of Limnology and Oceanography, Aquatic Sciences Meeting, Salt Lake City, UT.

2007: International Planning Committee for the Goldschmidt 2009 Geochemistry meeting, Davos, Switzerland

2007:Theme Team Chair for “Life at the Edge”, Goldschmidt 2009 Geochemistry meeting, Davos, Switzerland

2005-2008: Member (appointed), Science Steering and Evaluation Panel for the International Ocean Drilling Program.

2004-2005: Lead Organizational Editor for a Special Issue of Limnology and Oceanography