Changes in CDOM fluorescence from allochthonous and autochthonous sources during tidal mixing and bacterial degradation in two coastal estuaries

Boyd, Thomas J.; Osburn, Christopher L.

doi:10.1016/j.marchem.2004.02.012

Cited by 113 publications

(76 citation statements)

References 52 publications

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“…These results are consistent with the data reported by Wang et al who examined the CDOM release from salt marsh plants and seagrasses. Bacteria utilized both protein-associated and humic-like CDOM released from P. australis and S. salsa, suggesting that these CDOM components are biologically labile for bacterial degradation in coastal waters [8,36,[46][47][48]. These fluorescence results also support our DOC results as discussed above.…”

Section: Leaching and Characterization Of Cdomsupporting

confidence: 88%

Release and Microbial Degradation of Dissolved Organic Carbon and Nitrogen from Phragmites australis and Suaeda salsa in the Wetland of the Yellow River Estuary

Qi¹,

Xue²,

Wang³

2017

J Oceanogr Mar Res

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Section: Leaching and Characterization Of Cdomsupporting

confidence: 88%

Release and Microbial Degradation of Dissolved Organic Carbon and Nitrogen from Phragmites australis and Suaeda salsa in the Wetland of the Yellow River Estuary

Qi¹,

Xue²,

Wang³

2017

J Oceanogr Mar Res

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“…In coastal regions, especially in areas close to river outflows, the riverine input, and its mixing with marine waters are the major factors controlling the distribution and composition of DOM (Stedmon and Markager, 2003;Guo et al, 2007;Alling et al, 2010). In these waters processes such as photobleaching (Opsahl and Benner, 1998;Stubbins et al, 2006;Helms et al, 2008Helms et al, , 2014Porcal et al, 2013Porcal et al, , 2015, sorption to sediments, flocculation (Uher et al, 2001;Shank et al, 2005;Guo et al, 2007;von Wachenfeldt et al, 2008;Asmala et al, 2014), biological uptake (Boyd and Osburn, 2004), biological release (Romera-Castillo et al, 2010), and photo-production of DOM (Helms et al, 2014) can also play a crucial role in controlling the amount, composition, and reactivity of DOM in these environments.…”

Section: Introductionmentioning

confidence: 99%

From Fresh to Marine Waters: Characterization and Fate of Dissolved Organic Matter in the Lena River Delta Region, Siberia

et al. 2015

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Connectivity between the terrestrial and marine environment in the Artic is changing as a result of climate change, influencing both freshwater budgets, and the supply of carbon to the sea. This study characterizes the optical properties of dissolved organic matter (DOM) within the Lena Delta region and evaluates the behavior of DOM across the fresh water-marine gradient. Six fluorescent components (four humic-like; one marine humic-like; one protein-like) were identified by Parallel Factor Analysis (PARAFAC) with a clear dominance of allochthonous humic-like signals. Colored DOM (CDOM) and dissolved organic carbon (DOC) were highly correlated and had their distribution coupled with hydrographical conditions. Higher DOM concentration and degree of humification were associated with the low salinity waters of the Lena River. Values decreased toward the higher salinity Laptev Sea shelf waters. Results demonstrate different responses of DOM mixing in relation to the vertical structure of the water column, as reflecting the hydrographical dynamics in the region. Two mixing curves for DOM were apparent. In surface waters above the pycnocline there was a sharper decrease in DOM concentration in relation to salinity indicating removal. In the bottom water layer the DOM decrease within salinity was less. We propose there is a removal of DOM occurring primarily at the surface layer, which is likely driven by photodegradation and flocculation.

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“…Also other optical properties, namely fluorescence properties of DOM, can be used to assess its bioavailability. Typically, bacterial degradation increases the amount of humic-like fluorescence in the DOM pool (Boyd and Osburn, 2004).…”

Section: Introductionmentioning

confidence: 99%

Bioavailability of riverine dissolved organic matter in three Baltic Sea estuaries and the effect of catchment land use

et al. 2013

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Abstract. The microbial degradation of dissolved organic carbon and nitrogen (DOC, DON) was studied in three Finnish boreal estuaries with contrasting land use patterns (Kiiminkijoki -natural forest and peatland; Kyrönjoki -agricultural; Karjaanjoki -mixed/urban). Bioassays of 12-18 d long durations were used in 3 seasons at in situ temperatures. Besides the bulk parameters, a suite of dissolved organic matter (DOM) quality parameters were also investigated, including colored DOM (CDOM), fluorescent DOM and the molecular weight of DOM. Bioavailable DOC and DON pools varied significantly between the estuaries, from 7.9 to 10.6 % and from 5.5 to 21.9 %, respectively. DOM originating from the catchment dominated by natural forests and peatlands (Kiiminkijoki) had the lowest DOC and DON degradation rates, as well as the lowest proportions of biodegradable DOC and DON. A greater proportion of agricultural land in the catchment increased the bioavailability of DON, but not the bioavailability of DOC (Kyrönjoki). Additionally, DOM quality varied significantly between the estuaries, and DOM originating from the agricultural Kyrönjoki catchment sustained higher DOC and DON degradation rates and higher bacterial growth efficiency (BGE) compared to those of the natural forest and peat dominated Kiiminkijoki catchment. The quality of DOM, indicated by differences in CDOM, fluorescent DOM and molecular weight, varied between estuaries with differing land use and was concluded to be major driver of BGE of these systems and thereafter to the microbial CO 2 fluxes from the estuaries. The differences in BGE resulted in a 5-fold difference in the calculated daily bacterial CO 2 emissions between the study's estuaries due to bacterial activity, ranging from 40 kg C d −1 in the Karjaanjoki estuary to 200 kg C d −1 in the Kyrönjoki estuary. Lower DOC : DON ratios, smaller molecular weight and higher CDOM absorption spectral slope values of DOM resulted in higher proportion of the initial DOC and DON being transferred to microbial growth and therefore to the pelagic food web. The pristine, peatland and forest-dominated Kiiminkijoki catchment had the lowest BGE, and therefore proportionally highest CO 2 fluxes.

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Changes in CDOM fluorescence from allochthonous and autochthonous sources during tidal mixing and bacterial degradation in two coastal estuaries

Cited by 113 publications

References 52 publications

Release and Microbial Degradation of Dissolved Organic Carbon and Nitrogen from Phragmites australis and Suaeda salsa in the Wetland of the Yellow River Estuary

Release and Microbial Degradation of Dissolved Organic Carbon and Nitrogen from Phragmites australis and Suaeda salsa in the Wetland of the Yellow River Estuary

From Fresh to Marine Waters: Characterization and Fate of Dissolved Organic Matter in the Lena River Delta Region, Siberia

Bioavailability of riverine dissolved organic matter in three Baltic Sea estuaries and the effect of catchment land use

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