Patterns and Importance of Dissolved Organic Carbon in Four Acidic Brownwater Streams in Nova Scotia, Canada

Clair, Ta; Freedman, Bill

doi:10.1007/978-94-009-3385-9_120

Cited by 2 publications

(7 citation statements)

References 12 publications

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“…Values from the lake and stream varied from 7 to 27mg 1-1 over the study period . These are typical for the area (Clair & Freedman, 1986) . The values suggest the dilution of soil organic matter by runoff in April at most sites, with an increasing tendency for concentration in June .…”

Section: Resultsmentioning

confidence: 99%

“…Soils in this region are shallow and drainage conditions are often poor, resulting in high incidences of wet and boggy soils. Because of these conditions, surface waters are generally high in DOC with values ranging from 5 to 40 mg 1 -1 (Kerekes et al, 1986 ;Clair & Freedman, 1986) .…”

Section: Fieldmentioning

confidence: 99%

“…The main physical factors involved in the modification of DOM quantity and quality in freshwaters are temperature, which controls biological formation and modification of DOM and hydrology, which controls the flow of DOM out of soils into surface waters . In southwest Nova Scotia, DOM concentrations are highest in the summer at low water flow periods, and lowest in the winter-early spring when river discharge is at its maximum (Clair & Freedman, 1986 activity as well as runoff are low, b) March when runoff is high and biological activity still low, c) April when flow is receding and biological activity is increasing, d) June, when DOM is actively being modified by chemical and biological processes under low runoff conditions, and e) November when runoff increases again, and modification of soil and water DOM by biological and chemical processes is reduced . No sampling could be done at the Bog site in January and March because it was completely frozen .…”

Section: Fieldmentioning

confidence: 99%

“…DOM, which is usually measured as dissolved organic carbon (DOC), and is often an important constituent of freshwaters though abundances in lakes and rivers has been shown to vary temporally and spatially (Clair & Freedman, 1986 ;Meybeck, 1982) .…”

Section: Introductionmentioning

confidence: 99%

“…It has often been shown however, that poor statistical relationships exist between these parameters (e .g . Clair & Freedman, 1986) . Moreover, the results acquired cannot be used in rigorous fashion to describe DOM chemistry, nor to discuss its origin and diagenesis .…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variation in the composition of aquatic organic matter in some Nova Scotian brownwaters: a nuclear magnetic resonance approach

Claire

Sayer²,

Kramer

et al. 1996

Hydrobiologia

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Using a novel concentration technique (reverse osmosis and freeze-drying) as well as a standard analytical technique little used with limnological samples (solid state 13 C nuclear magnetic resonance), we studied the chemical structure of aquatic organic matter from four closely located freshwater sites in Nova Scotia . The main conclusions drawn from the data are that : (a) the aromatic C fraction which is assumed to be refractory remains at less than 10% of the total, with a slight increase in relative importance in the fall, (b) less structurally complex aliphatic carbon decreases from winter to spring and remains at lower levels into later fall, (c) carbohydrates are at a maximum during the summer, (d) the carboxylic C fraction is at a minimum in the summer and maximum in the fall and winter . Results show roughly the same annual patterns of C composition for the two running water sites . Our data suggest that the hydrological processes which carry terrestrial and wetland DOM to streams and lakes allow a selective adsorption process of DOM to occur in soils . We compare our data to those from other freshwater studies and suggest that the importance of aromatic carbon in freshwaters has probably been overestimated in the past, with a corresponding underestimate of the more biologically labile carbohydrate and aliphatic material .

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Section: Resultsmentioning

confidence: 99%

Section: Fieldmentioning

confidence: 99%

Section: Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal variation in the composition of aquatic organic matter in some Nova Scotian brownwaters: a nuclear magnetic resonance approach

Claire

Sayer²,

Kramer

et al. 1996

Hydrobiologia

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Distribution and Characteristics of Blackwater Rivers and Streams of the Contiguous United States

Flotemersch,

Blocksom,

Herlihy

et al. 2024

Water Resources Research

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Blackwater rivers and streams have stained or tea‐colored water from tannins released by decaying plant matter. Natural conditions in these waters often differ from non‐blackwater systems. For example, the pH and oxygen levels in waters can be very low, but completely natural. We examined an existing USEPA data set and found that blackwaters existed across the contiguous United States but were most common in the east. Water chemistry showed differences between blackwater and non‐blackwater sites, but differences were not consistent across ecoregions making national scale generalizations difficult. Physical habitat data analysis did not show dramatic differences between blackwater and non‐blackwater sites. Blackwater typically arises from streams that drain tannin‐rich bogs/muskeg and wetlands, so as expected blackwater sites had a shorter Euclidean distance to wetlands than non‐blackwater sites and existed in watersheds with a higher percentage of wetland habitat. Blackwaters in Northern and Temperate Plains tended to have higher acid neutralizing capacity, conductivity, and lower True Color; a visual color scale used for water purity. We posit that differences were because Color and Dissolved Organic Carbon at these sites were from buried wetland deposits rather than contemporary wetland habitats. Research needs that may increase our understanding and management of blackwaters include development of an operational definition that includes a classification framework and reference conditions for different blackwater types, identification of stressors and their associated dynamics that negatively impact blackwater systems, and development of data‐driven, consistent, and repeatable assessment methods, including development of targets, protective of unique conditions in blackwater rivers and streams.

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Patterns and Importance of Dissolved Organic Carbon in Four Acidic Brownwater Streams in Nova Scotia, Canada

Cited by 2 publications

References 12 publications

Seasonal variation in the composition of aquatic organic matter in some Nova Scotian brownwaters: a nuclear magnetic resonance approach

Seasonal variation in the composition of aquatic organic matter in some Nova Scotian brownwaters: a nuclear magnetic resonance approach

Distribution and Characteristics of Blackwater Rivers and Streams of the Contiguous United States

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