@article {467,
	title = {Changes in sediment and organic carbon accumulation in a highly-disturbed ecosystem: The Sacramento-San Joaquin River Delta (California, USA)},
	journal = {Marine Pollution Bulletin},
	volume = {59},
	year = {2009},
	note = {id: 1845; Sp. Iss. SI 477XX Times Cited:1 Cited References Count:49Y},
	pages = {154-163},
	abstract = {We used the Sacramento-San Joaquin River Delta CA (Delta, hereafter) as a model system for understanding how human activities influence the delivery of sediment and total organic carbon (TOC) over the past 50-60 years. Sediment cores were collected from sites within the Delta representing the Sacramento River (SAC), the San Joaquin River (SJR), and Franks Tract (FT), a flooded agricultural tract. A variety of anthropogenic tracers including (CS)-C-137, total DDE (Sigma DDE) and brominated diphenyl ether (BDE) congeners were used to quantify sediment accumulation rates. This information was combined with total organic carbon (TOC) profiles to quantify rates of TOC accumulation. Across the three sites, sediment and TOC accumulation rates were four to eight-fold higher prior to 1972. Changes in sediment and TOC accumulation were coincident with completion of several large reservoirs and increased agriculture and urbanization in the Delta watershed. Radiocarbon content of TOC indicated that much of the carbon delivered to the Delta is "pre-aged" reflecting processing in the Delta watershed or during transport to the sites rather than an input of predominantly contemporary carbon (e.g., 900-1400 years BP in surface sediments and 2200 yrs BP and 3610 yrs BP at the base of the SJR and FT cores, respectively). Together, these data suggest that human activities have altered the amount and age of TOC accumulating in the Delta since the 1940s. (C) 2009 Elsevier Ltd. All rights reserved.},
	issn = {0025-326X},
	doi = {10.1016/j.marpolbul.2009.03.025},
	author = {Canuel, E. A. and Lerberg, E. J. and Dickhut, R. M. and Kuehl, S. A. and Bianchi, T. S. and Wakeham, S. G.}
}
@article {478,
	title = {Partitioning of organic matter in continental margin sediments among density fractions},
	journal = {Marine Chemistry},
	volume = {115},
	year = {2009},
	note = {id: 1844; 521ZI Times Cited:0 Cited References Count:99Y},
	pages = {211-225},
	abstract = {Hydrodynamic processes sort and redistribute organic matter (OM) and minerals on continental margins. Density fractionations were conducted on sediments from diverse margins (Mexico margin, Gulf of Mexico, Mississippi River delta, Eel River margin) to investigate the nature, provenance and age of OM among density fractions. Mass. elemental (C and N), lignin, and surface area distributions, as well as stable carbon and radiocarbon isotopic compositions were measured, The lowest density fractions (2.5 g cm(-3)) were OC-poor (\%OC -200 parts per thousand). Ratios of vanillic acid to vanillin (Ad/Al)v among lignin oxidation products increase with increasing particle density suggesting variable lignin sources or selective degradation of lignin among the different density fractions. (C) 2009 Elsevier B.V. All rights reserved.},
	issn = {0304-4203},
	doi = {10.1016/j.marchem.2009.08.005},
	author = {Wakeham, S. G. and Canuel, E. A. and Lerberg, E. J. and Mason, P. and Sampere, T. P. and Bianchi, T. S.}
}
@article {1936,
	title = {Bioreactivity of estuarine dissolved organic matter: A combined geochemical and microbiological approach},
	journal = {Limnology and Oceanography},
	volume = {51},
	year = {2006},
	note = {040scTimes Cited:39
Cited References Count:32
},
	month = {Jan},
	pages = {94-100},
	abstract = {An integrated multidisciplinary study utilizing geochemical and microbial ecological approaches was conducted to characterize the origins, chemical nature, and quantities of dissolved and particulate organic matter (OM) utilized by heterotrophic bacteria in a temperate estuary. C: N, stable isotope (delta C-13), and lipid biomarker analyses revealed differences in the inferred reactivity of autochthonous versus allochthonous OM sources. Isotopic comparison of OM size fractions and bacterial nucleic acids suggests that high-molecular-weight dissolved OM (DOM) is consistently linked to bacterial biomass synthesis along the estuarine salinity gradient. Polyunsaturated fatty acids (as percent of total fatty acids, FA) were a reliable predictor of DOM decomposition in bioassays, thus providing an indicator directly linking DOM reactivity to its composition. Significant positive correlations between FA diagnostic of bacterial sources and lipid biomarker compounds diagnostic of planktonic origin indicate a systematic bacterial response to autochthonous DOM sources along the estuarine continuum. These findings further suggest that, although the geochemical signature of algal-derived OM in the dissolved phase may appear quantitatively insignificant, this fraction may nevertheless represent a principal source of bioreactive OM to heterotrophic bacteria in estuarine waters.},
	keywords = {acids, bacteria, bay, bioavailability, carbon-isotope analysis, extraction, food webs, sediments},
	isbn = {0024-3590},
	doi = {10.4319/lo.2006.51.1.0094},
	author = {McCallister, S. L. and Bauer, J. E. and Canuel, E. A.}
}
@article {1937,
	title = {Dissolved and particulate organic matter source-age characterization in the upper and lower Chesapeake Bay: A combined isotope and biochemical approach},
	journal = {Limnology and Oceanography},
	volume = {51},
	year = {2006},
	note = {045nhTimes Cited:24
Cited References Count:37
},
	month = {May},
	pages = {1421-1431},
	abstract = {In order to characterize the sources and ages of organic matter contributing to river and estuarine outflow waters, the present study investigated Delta C-14 and delta C-13 signatures of the major operationally defined biochemical classes of ultrafiltered dissolved organic matter (UDOM) in conjunction with lipid biomarker and elemental compositions of UDOM and suspended particulate organic matter (POM) in the Chesapeake Bay. Freshwater (Susquehanna River) UDOM was dominated by a molecularly uncharacterized (MUC) fraction, followed by total carbohydrate (TCHO), total hydrolysable amino acid (THAA) and total lipid (TLE) components. In contrast, UDOM at the bay mouth (salinity similar to 22-24) was comprised mainly of TCHO, followed by MUC, THAA, and TLE. The Delta C-14 and delta C-13 signatures of both UDOM and its major biochemical classes indicate that Susquehanna DOM is derived in part from old allochthonous terrestrial sources, whereas young marine sources dominate at the bay mouth. In contrast to the other biochemical classes, lipophilic DOM at both sites was very old (similar to 5,000-7,000 years B.P.). In addition, factor analysis of lipid biomarker compounds revealed unique signatures for the UDOM and POM pools that imply disparate source and/or recycling properties as well as potential influences due to physical partitioning. Lipid biomarker compounds showed that although autochthonous riverine/estuarine sources dominated both the UDOM and POM pools, terrigenous lipids were elevated in the Susquehanna during high flow conditions. The presence of lipid biomarkers diagnostic of "fresh" algal material in UDOM further suggested its greater reactivity than POM. The observed biochemical and lipid biomarker compositions and isotopic signatures of UDOM and POM are consistent with previous findings suggesting that these two major organic matter pools have dissimilar reactivities and cycling times, and they derive from comparatively unique source-age materials in rivers and estuaries.},
	keywords = {biomarkers, carbon, delta-c-13, lipid-composition, ocean, radiocarbon, river, san-francisco, sediments, variability},
	isbn = {0024-3590},
	doi = {10.4319/lo.2006.51.3.1421},
	author = {Loh, A. N. and Bauer, J. E. and Canuel, E. A.}
}
@article {1935,
	title = {Sources and potential transformation of estuarine dissolved and particulate organic matter: a multi-tracer approach},
	journal = {Organic Geochemistry},
	volume = {37},
	year = {2006},
	note = {id: 597},
	month = {2006},
	pages = {454-468},
	author = {McCallister, S. L. and Bauer, J. E. and Ducklow, H. W. and Canuel, E. A.}
}
@conference {1611,
	title = {Dissolved and particulate organic matter source-age characterization in river and estuarine outflow waters: a combined isotope and biochemical approach},
	booktitle = {ASLO Summer Meeting},
	year = {2005},
	note = {id: 482},
	month = {2005},
	address = {Santiago de Compostela, Spain},
	author = {Loh, A. N. and Bauer, J. E. and Canuel, E. A.}
}
