Biological availability of dissolved organic carbon along the Ogeechee River

Leff, Laura Gunn; Meyer, Judy L.

doi:10.4319/lo.1991.36.2.0315

Cited by 114 publications

(90 citation statements)

References 15 publications

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“…However, we do acknowledge, that these filters do not necessarily remove all bacterivores and that a small number could have remained in the inoculum. Although some have argued strongly that in such studies, the use of a ''defined'' microbial inocula is warranted in order to provide an absolute measure of DOC quality (Leff and Meyer 1991), the use of a native assemblage in this study was justified. As we were working with fresh and saline water, it would have been impossible to develop a defined inocula which would grow in both systems.…”

Section: Methodsmentioning

confidence: 99%

Changes in composition and reactivity of allochthonous DOM in a prairie saline lake

Waiser

Robarts

2000

Limnology & Oceanography

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Inland saline lakes in semiarid regions of the Canadian prairies contain some of the highest known concentrations of dissolved organic carbon (DOC). This dissolved organic matter (DOM) represents a potentially important carbon and energy source for aquatic bacteria. Redberry Lake, an oligotrophic saline lake in central Saskatchewan, is located in a hydrologically closed basin and has high levels of DOC (seasonal mean 35 mg L Ϫ1 ). Despite such high DOC concentrations, lake water is clear. Lake DOM is predominantly allochthonous, and enters the lake via the major inflow, Oscar Creek. Despite its origin, this DOM is compositionally much different than its creek counterpart. Approximately 73% of total lake DOM is low in molecular weight (Ͻ1000 D). XAD-8 isolated hydrophobic organic acids (HPOA) are low in aromaticity, have high C : N ratios and a certain percentage are old (ϳ700 years). In comparison, creek water, despite having lower DOC concentrations than the lake (14.9 mg L Ϫ1 ) is highly colored. Fifty-five per cent of this DOC is low in molecular weight and isolated DOM has higher aromaticity and lower C : N ratio than lake DOM. As a result of these changes in DOM, ultraviolet light penetrates much deeper into lake water as compared to the creek. Photolysis experiments revealed that DOM in Oscar Creek and Redberry Lake is photoreactive. Changes in lake DOM are not only linked to location within a hydrologically closed basin and photochemistry, but provide the explanation for the optically different character of DOC in this geographical region. Changes in lake DOM have had an effect at the microbial level as well. Little of the lake DOM appears available for bacterial growth as a result of these photochemical changes. Creek DOM, having a shorter residence time, does not appear to have been as photochemically changed and consequently is more available for bacterial growth.

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Section: Methodsmentioning

confidence: 99%

Changes in composition and reactivity of allochthonous DOM in a prairie saline lake

Waiser

Robarts

2000

Limnology & Oceanography

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“…Buffam et al (2001) for example showed in freshwater streams that storm flow, whilst only occurring for a fraction of the time compared to base flow, accounted for over half the annual DOC load. Wiegner et al (2009) and Leff and Meyer (1991) have shown that the bioavailability of DOC to heterotrophic bacteria can change between storm and base flow conditions. Our separation of storm flows into flood, fresh and base flow categories here has proven useful as a simple way of understanding how variable hydrological conditions may structure carbon dynamics.…”

Section: 5)mentioning

confidence: 99%

Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics

Hitchcock

Mitrovic

2015

Estuarine, Coastal and Shelf Science

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Freshwater inflows play a key role in the delivery of organic carbon to estuaries. However, our understanding of the dynamics between discharge and carbon globally is limited. In this study we performed a 30-month monitoring study on the Bega and Clyde River estuaries, Australia, to understand the influence that discharge had on carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics. We hypothesised that 1) discharge would be the most important factor influencing carbon and nutrient concentrations, though during low flows chlorophyll a would also be positively related to carbon, 2) bacteria would be related to dissolved organic carbon (DOC), and chlorophyll a to temperature, nitrogen and phosphorus, and 3) that concentrations of carbon, nitrogen, phosphorus, bacterial biomass and chlorophyll a would be significantly different between large 'flood flows', smaller 'fresh flows' and base flow conditions. We found that discharge was always the most important factor influencing carbon and nutrient concentrations, and that primary production appeared to have little influence on the variation in DOC concentration even during base flow conditions. We suggest this relationship is likely due to highly episodic discharge that occurred during the study period. Bacteria were related to DOC in the lower estuary sites, but phosphorus in the upper estuary. We suggest this is likely due to the input of bioavailable carbon in the upper estuary leading bacteria to be P limited, which changes downstream to carbon limitation as DOC becomes more refractory. Chlorophyll a was positively related to temperature but not nutrients, which we suggest may be due to competition with bacteria for phosphorus in the upper estuary. Carbon, nitrogen and phosphorus concentrations were different under flood, fresh and base flow conditions, though these differences sometimes varied between estuary locations for different resources. Overall, the results demonstrate that discharge plays an important structuring role for carbon, nutrient and bacteria dynamics on the Bega and Clyde Rivers, and that the differences observed between flood and fresh inflows suggest that further study into the influence of differently sized inflow events is important.

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“…They are second-to third-order streams with different vegetation types, located in different regions of the USA. The streams are as follows: Meyers Branch, located on the Savannah River Site near Aiken, South Carolina a blackwater stream with dense vegetation dominated by cypress, tupelo, maple, hickory, willow, and birch [9]; Black Creek, another blackwater stream, on the lower coastal plain of Georgia with cypress-dominated floodplains [15] [7]; and the West Branch of the Mahoning River located within Jenning's Woods in Portage County, Ohio [13], a highly shaded stream with riparian vegetation that includes oak, maple, sycamore, and poplar.…”

Section: Study Sites and Sample Collectionmentioning

confidence: 99%

“…Several studies have reported dynamic changes, both spatially, within a watershed, and temporally, in the abundance and distribution of selected stream bacterial populations [11,12,[14][15][16][17]19]. However, differences in stream bacterial populations among watersheds from diverse regions exhibiting differing environmental conditions have not been examined [10].…”

Section: Introductionmentioning

confidence: 99%

“…Streams were selected based on differences in their organic matter dynamics and use in prior studies [3,7,9,13,15,22,26,29]. Streams examined included coastal plain blackwater streams (with high amounts of DOM, in VA, GA, and SC), well-canopied streams (Appalachian Mountain, NC, and northeast OH), more open canopied streams (prairie, KS, and agricultural, IA), a stream with large populations of macrophytes (WI), and a stream in a watershed with forests, agricultural fields, and wetlands (MI).…”

Section: Introductionmentioning

confidence: 99%

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Abundance of Three Bacterial Populations in Selected Streams

2005

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The population sizes of three bacterial species, Acinetobacter calcoaceticus, Burkholderia cepacia, and Pseudomonas putida, were examined in water and sediment from nine streams in different parts of the United States using fluorescent in situ hybridization (FISH). Population sizes were determined from three sites (upstream, midstream, and downstream) in each stream to compare differences in the occurrence and distribution of the species within each stream and among streams. Physical and chemical variables measured reflected differences in environmental conditions among the streams. In the water, B. cepacia numbers were highest in the agricultural, Iowa stream. P. putida numbers were highest in the southern coastal plain streams, Black Creek (GA) and Meyers Branch (SC). Compared to the other two species, the abundance of A. calcoaceticus was similar in all the streams. In sediment, the greatest abundance of all three species was found in the Iowa stream, while the lowest was in Hugh White Creek (NC). Detrended correspondence analysis (DCA) explained 95.8% and 83.9% of the total variation in bacterial numbers in water and sediment of the streams, respectively. In sediments and water, B. cepacia numbers were related to nitrate concentrations. A. calcoaceticus in water clustered with several environmental variables (i.e., SRP, pH, and conductivity) but benthic populations were less well correlated with these variables. This study reveals the potential influence of various environmental conditions on different bacterial populations in stream communities.

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Biological availability of dissolved organic carbon along the Ogeechee River

Cited by 114 publications

References 15 publications

Changes in composition and reactivity of allochthonous DOM in a prairie saline lake

Changes in composition and reactivity of allochthonous DOM in a prairie saline lake

Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics

Abundance of Three Bacterial Populations in Selected Streams

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