Functional variability of dissolved organic matter from the surface water of a productive lake

Gondar, D.; Thacker, Sarah; Tipping, Edward; Baker, Andy

doi:10.1016/j.watres.2007.07.006

Cited by 28 publications

(18 citation statements)

References 22 publications

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“…Overall, the water binding capacity of both rivers with respect to all examined HM was higher in summer. The obtained results are in good agreement with data of [11,14], according to which DOM production within water body increases in summer because of plankton growth. Moreover, the greater surface runoff in spring and summer leads to an increase in the concentration of allochthonous DOM, which can also contribute largely to metal bioavailability.…”

Section: Resultssupporting

confidence: 88%

The modifying effect of natural waters on the toxicity of heavy metals for algae Chlorella vulgaris

Stravinskene

Grigor’ev

2012

Water Resour

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Section: Resultssupporting

confidence: 88%

The modifying effect of natural waters on the toxicity of heavy metals for algae Chlorella vulgaris

Stravinskene

Grigor’ev

2012

Water Resour

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“…Although simple absorption and fluorescence DOM quality parameters have frequently been used in the past to characterize natural DOM (Gondar et al 2008;Green and Blough 1994), they are not always the best tools to employ. For example, absorbance measurements are subject to interferences from particles and inorganic species such as iron and nitrate (Weishaar et al 2003), these interferences being more important at low [DOC] than at high [DOC] situations (Green and Blough 1994;.…”

Section: Parafacmentioning

confidence: 99%

“…Optical properties of DOM that have been used to distinguish between the types of DOM include absorbance (Gondar et al 2008;Weishaar et al 2003) and fluorescence (Coble 1996;McKnight et al 2001;Stedmon and Markager 2005). Absorbance and fluorescence spectroscopy are particularly useful tools in the analysis of DOM quality, in that they are relatively simple, rapid, sensitive, and non-destructive.…”

Section: Introductionmentioning

confidence: 99%

Spatial Variation in the Optical Properties of Dissolved Organic Matter (DOM) in Lakes on the Canadian Precambrian Shield and Links to Watershed Characteristics

2011

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In the present study, we explored the use of various optical parameters to detect differences in the composition of the dissolved organic matter (DOM) in a set of lakes that are all located on the Canadian Precambrian Shield, but within which Cu and Ni speciation predictions were previously shown to diverge from measured values in some lakes but not in others. Water samples were collected with in situ diffusion samplers in 2007 (N = 18 lakes) and 2008 (N = 8 lakes). Significant differences in DOM quality were identified between the sampling regions (Rouyn-Noranda, Québec and Sudbury, Ontario) and among lakes, based on dissolved organic carbon concentrations ([DOC]), specific UV absorbance (SUVA 254 ), fluorescence indices (FI), and excitation-emission matrix (EEM) fluorescence measurements. Parallel factor analysis (PARAFAC) of the EEM spectra revealed four components, two of which (C3, oxidized quinone fluorophore of allochthonous origin, and C4, tryptophan-like protein fluorescence of autochthonous origin) showed the greatest inter-regional variation. The inter-lake differences in DOM quality were consistent with the regional watershed characteristics as determined from satellite imagery (e.g., watershed-to-lake surface area ratios and relative percentages of surface water, rock outcrops vegetative cover and urban development). Source apportionment plots, built upon PARAFAC components ratios calculated for our lakes, were used to discriminate among DOM sources and to compare them to sources identified in the literature. These results have implications for other areas of research, such as quantifying lake-to-lake variations in the influence of organic matter on the speciation of trace elements in natural aquatic environments.

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“…This production is a critical link in the microbial loop of aquatic ecosystems. In a lake system that experiences a wide range of Chl a concentrations, Gondar et al (2008) report that concentrations of autochthonous DOM are significantly correlated with Chl a concentrations (a proxy for primary production by phytoplankton). Likewise, in the Arctic Ocean, Davis and Benner (2007) have shown that there is a strong seasonal link between primary productivity and the production of labile DOM.…”

Section: Conservative and Reactive Transport Modeling Of Dom-mentioning

confidence: 99%

A model of degradation and production of three pools of dissolved organic matter in an alpine lake

Miller

McKnight

Chapra

et al. 2009

Limnology & Oceanography

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We investigated the transport and production of dissolved organic matter (DOM) in an alpine lake in the Colorado Front Range during snowmelt and the summer ice-free season by employing a new approach for distinguishing between three pools of DOM based on fractionation and spectroscopic characterization. Reactive transport modeling results confirm that terrestrially derived sources of humic DOM are dominant during snowmelt and that microbially derived humic and nonhumic DOM are produced in the lake in the summer, when rates of primary productivity are highest. DOM characterization and modeling results support the interpretation that losses of terrestrially derived humic DOM are dependent on photochemistry and indicate that the decay of nonhumic and microbially derived humic DOM is more influenced by heterotrophic degradation. Results suggest that production of nonhumic DOM can be directly related to chlorophyll a concentrations and that microbially derived humic DOM can be produced through condensation reactions. Furthermore, fluorescence and parallel factor analysis (PARAFAC) of DOM suggest that the rate of decay of microbially derived humic DOM decreases as the redox state of quinone-like moieties of the DOM becomes more oxidized. This study quantifies the influence of DOM source on the chemical and biological reactivity of DOM in lakes. The methods presented in this study provide a framework for testing hypotheses related to the effects of a changing climate on lake ecosystem structure and function.

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Functional variability of dissolved organic matter from the surface water of a productive lake

Cited by 28 publications

References 22 publications

The modifying effect of natural waters on the toxicity of heavy metals for algae Chlorella vulgaris

The modifying effect of natural waters on the toxicity of heavy metals for algae Chlorella vulgaris

Spatial Variation in the Optical Properties of Dissolved Organic Matter (DOM) in Lakes on the Canadian Precambrian Shield and Links to Watershed Characteristics

A model of degradation and production of three pools of dissolved organic matter in an alpine lake

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