Assessing dissolved organic matter dynamics and source strengths in a subtropical estuary: Application of stable carbon isotopes and optical properties

Ya, Chao; Anderson, William T.; Jaffé, Rudolf

doi:10.1016/j.csr.2014.10.005

Cited by 25 publications

(16 citation statements)

References 67 publications

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“…δ 13 C DOC samples were filtered with GF/F (0.7 µm) filter, and then stored in pre-cleaned 40 mL bottles until analyses. Measurements for δ 13 C DOC were made using a total organic carbon (TOC) analyzer (Aurora 1030W, OI Analytical) coupled to a cavity ring-down spectroscopy system (CRDS; G1111-i, Picarro) following the approach of Ya et al (2015). DIC was removed by adding H 3 PO 4 and sparging with N 2 .…”

Section: Stable Carbon Isotopic Compositionmentioning

confidence: 99%

Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Ferrón

Engel

et al. 2017

Biogeosciences

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Abstract. The Shark and Harney rivers, located on the southwest coast of Florida, USA, originate in the freshwater, karstic marshes of the Everglades and flow through the largest contiguous mangrove forest in North America. In November 2010 and 2011, dissolved carbon source-sink dynamics was examined in these rivers during SF 6 tracer release experiments. Approximately 80 % of the total dissolved carbon flux out of the Shark and Harney rivers during these experiments was in the form of inorganic carbon, either via air-water CO 2 exchange or longitudinal flux of dissolved inorganic carbon (DIC) to the coastal ocean. Between 42 and 48 % of the total mangrove-derived DIC flux into the rivers was emitted to the atmosphere, with the remaining being discharged to the coastal ocean. Dissolved organic carbon (DOC) represented ca. 10 % of the total mangrove-derived dissolved carbon flux from the forests to the rivers. The sum of mangrove-derived DIC and DOC export from the forest to these rivers was estimated to be at least 18.9 to 24.5 mmol m −2 d −1 , a rate lower than other independent estimates from Shark River and from other mangrove forests.Results from these experiments also suggest that in Shark and Harney rivers, mangrove contribution to the estuarine flux of dissolved carbon to the ocean is less than 10 %.

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Section: Stable Carbon Isotopic Compositionmentioning

confidence: 99%

Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Ferrón

Engel

et al. 2017

Biogeosciences

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“…However, the interpretation of the isotopic ratio from a bulk sample in complex coastal environments is somewhat complicated by the overlap of isotopic ranges. Thus, several studies have used δ 13 C-DOC combined with FDOM (Osburn and Stedmon, 2011;Ya et al, 2015;and Lu et al, 2015) or carbon isotope ratios combined with the C/N ratio (Thornton and McManus, 1994;Andrews et al, 1998;Wang et al, 2004;McCallister et al, 2006;and Pradhan et al, 2014) to discriminate different sources of DOM in estuarine and coastal waters. As far as we know, these three tracers have not yet been used together to determine DOM sources in coastal waters.…”

Section: Introductionmentioning

confidence: 99%

Tracing terrestrial versus marine sources of dissolved organic carbon in a coastal bay using stable carbon isotopes

Lee

Kim

2020

Biogeosciences

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Abstract. The sources of dissolved organic matter (DOM) in coastal waters are diverse, and they play different roles in the biogeochemistry and ecosystems of the ocean. In this study, we measured dissolved organic carbon (DOC) and nitrogen (DON), the stable carbon isotopic composition of dissolved organic carbon (δ13C-DOC), and fluorescent dissolved organic matter (FDOM) in coastal bay waters surrounded by large cities (Masan Bay, Republic of Korea) to determine the different DOM sources in this region. The surface seawater samples were collected in two sampling campaigns (August 2011 and August 2016). The salinities were in the range of 10–21 in 2011 and 25–32 in 2016. In 2011, excess DOC was observed in high-salinity (16–21) waters; the excess DOC source was found to be mainly from marine autochthonous production according to the δ13C-DOC values (−23.7 ‰ to −20.6 ‰), the higher concentrations of protein-like FDOM, and the lower DOC∕DON (C∕N) ratios (8–15). In contrast, excess DOC observed in high-salinity waters in 2016 was characterized by low FDOM, more depleted δ13C values (−28.8 ‰ to −21.1 ‰), and high C∕N ratios (13–45), suggesting that the source of excess DOC is terrestrial C3 plants by direct land–seawater interactions. Our results show that multiple DOM tracers such as δ13C-DOC, FDOM, and C∕N ratios are powerful for determining different sources of DOM occurring in coastal waters.

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“…Photochemical reactivity proxies established for Everglades DOM (Chen et al, 2010) were found to be equally applicable to the Okavango Delta DOM pool (Cawley et al 2012b). In addition, we applied the EEM-PARAFAC approach in combination with stable C isotopes to both Florida Bay Ya et al 2015) and Shark Bay (Cawley et al 2012a) to assess the contribution of living and senescent seagrass to the DOM pool. While seagrass communities were found to be significant contributors to the DOC pool based on C release through exudation during primary productivity, these studies determined that release of DOC through leaching from senescent seagrass also contributes to the DOC pool.…”

Section: What Shapes Food Webs In Estuarine Ecosystems With Poor Qualmentioning

confidence: 99%

New perspectives on an iconic landscape from comparative international long‐term ecological research

et al. 2015

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Abstract. Iconic ecosystems like the Florida Coastal Everglades can serve as sentinels of environmental change from local to global scales. This characteristic can help inform general theory about how and why ecosystems transform, particularly if distinctive ecosystem properties are studied over long time scales and compared to those of similar ecosystems elsewhere. Here we review the ways in which long-term, comparative, international research has provided perspectives on iconic features of the Everglades that have, in turn, informed general ecosystem paradigms. Studies in other comparable wetlands from the Caribbean to Australia have shed light on distinctive and puzzling aspects such as the ''upside-down estuary'' and ''productivity paradox'' for which the Everglades is known. These studies suggest that coastal wetlands on carbonate (karstic) platforms have: (1) hydrological and biogeochemical properties that reflect ''hidden'' groundwater sources of water and nutrients, (2) very productive, mat-forming algal communities that present a low-quality food to aquatic consumers that encourages (3) highly diversified feeding strategies within and among populations, and (4) extensive and productive seagrass meadows and mangrove forests that promote strong cultural dependencies associated with the ecosystem services they provide. The contribution of international research to each of these general ecological topics is discussed with a particular goal of encouraging informed decision-making in threatened wetlands across the globe.

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Assessing dissolved organic matter dynamics and source strengths in a subtropical estuary: Application of stable carbon isotopes and optical properties

Cited by 25 publications

References 67 publications

Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Tracing terrestrial versus marine sources of dissolved organic carbon in a coastal bay using stable carbon isotopes

New perspectives on an iconic landscape from comparative international long‐term ecological research

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