My Google Scholar Citations page is more up-to-date, at this time.
Aufdenkampe, A.K., E. Mayorga, J.I. Hedges, C.A. Llerena, P.D. Quay, J. Gudeman, A.V. Krusche and J.E. Richey. 2007. Organic matter in the Peruvian headwaters of the Amazon: Compositional evolution from the Andes to the lowland Amazon mainstem. Organic Geochemistry 38: 337-364 [pdf] [journal abstract]
Mayorga, E., A.K. Aufdenkampe, C.A. Masiello, A.V. Krusche, J.I. Hedges, P.D. Quay, J.E. Richey and T.A. Brown. 2005. Young organic matter as a source of carbon dioxide outgassing from Amazonian rivers. Nature 436: 538-541 [pdf] [journal abstract]
Mayorga, E., M.G. Logsdon, M.V.R. Ballester and J.E. Richey. 2005. Extracting cell-to-cell land surface drainage paths from digital channel networks, with an application to the Amazon basin. Journal of Hydrology 315: 167-182 [pdf] [journal abstract]
Mayorga, E. and A.K. Aufdenkampe. 2002. Processing of bioactive elements in the Amazon River system, p. 1-24. In: McClain, M. E. (ed.), The Ecohydrology of South American Rivers and Wetlands. IAHS Spec. Pub. no. 6, IAHS Press. Wallingford, UK [pdf] [Table of Contents for this issue]
I've also listed and tagged these articles on my CiteULike page. Following tags or other CiteULike users who have listed these articles on their libraries may lead to interesting, related research from others.
Finally, there's my 2004 Ph.D. thesis:
Isotopic constraints on sources and cycling of riverine dissolved inorganic carbon in the Amazon basin. School of Oceanography, University of Washington. Seattle, Washington. 241 pp. [pdf (3.1MB)]
I still have some material from here that I need to publish, specially that focusing specifically on DIC.
Aufdenkampe, A.K., E. Mayorga, C.A. Masiello, P.D. Quay, J.E. Richey, A.V. Krusche and T.A. Brown. In preparation. A reevaluation of organic matter sources and turnover within the floodplain-dominated Amazon River system: Three decades of elemental and isotopic data.
Harrison, J., R. Maranger, R. Alexander, A. Giblin, P.A. Jacinthe, E. Mayorga, S. Seitzinger, D. Sobota and W. Wollheim. In review. The regional and global significance of nitrogen removal in lakes and reservoirs. Biogeochemistry.
Liu, K.-K., S. Seitzinger, E. Mayorga, J. Harrison and V. Ittekkot. In press. Fluxes of nutrients and selected organic pollutants carried by rivers. In P. Rizzoli, B. Sundby, J. Melillo and E. Urban (eds.), Dynamics of semi-enclosed marine systems: the integrated effects of changes in sediment and nutrient input from land. IUGG-SCOPE-SCOR Rapid Assessment Process Project.
Glibert, P.M., E. Mayorga and S. Seitzinger. In press. Prorocentrum minimum tracks anthropogenic nitrogen and phosphorus inputs on a global basis: application of spatially explicit nutrient export models.
Richey, J.E., R.L. Victoria, E. Mayorga, L.A. Martinelli and R.H. Meade. 2004. Integrated analysis of a humid tropical region – The Amazon basin, p. 415-428. In: Kabat, P., M. Claussen, P.A. Dirmeyer, J.H.C. Gash, L. Bravo de Guenni, M. Meybeck, R.A. Pielke Sr., C.J. Vörösmarty, R.W.A. Hutjes & S. Lütkemeier (ed.), Vegetation, water, humans and the climate: A new perspective on an interactive system. Springer. Berlin.
Ballester, M.V., D.C. Victoria, A.V. Krusche, R. Coburn, R.L. Victoria, J.E. Richey, M.G. Logsdon, E. Mayorga and E. Matricardi. 2003. A Remote Sensing / GIS-based physical template to understand the biogeochemistry of the Ji-Paraná river basin (Western Amazonia). Remote Sensing of Environment 87: 429-445.
Grimm, N.B., S.E. Gergel, W.H. McDowell, E.W. Boyer, C.L. Dent, P.M. Groffman, S.C. Hart, J.W. Harvey, C.A. Johnston, E. Mayorga, M.E. McClain and G. Pinay. 2003. Merging aquatic and terrestrial perspectives of nutrient biogeochemistry. Oecologia 442: 485-501.
McClain, M.E., E.W. Boyer, C.L. Dent, S.E. Gergel, N.B. Grimm, P.M. Groffman, S.C. Hart, J.W. Harvey, C.A. Johnston, E. Mayorga, W.H. McDowell and G. Pinay. 2003. Biogeochemical hot spots and hot moments at the interface of terrestrial and aquatic ecosystems. Ecosystems 6: 301-312.
Hedges, J.I., E. Mayorga, E. Tsamakis and others. 2000. Organic matter in Bolivian tributaries of the Amazon River: A comparison to the lower mainstem. Limnology and Oceanography 45: 1449-1466.
McClain, M.E., E. Mayorga, M.G. Logsdon and J.E. Richey. 1996. A conceptual framework for modeling organic matter dynamics in large river systems, p. 323-326. In: S.H. Bottrell (ed.), Fourth International Symposium on the Geochemistry of the Earth's Surface. University of Leeds. Leeds.