Establishment of anaerobic, reducing conditions in lake sediment after deposition of acidic, aerobic sediment by a major storm

Bell, P E; Herlihy, Alan T.; Mills, Aaron L.

doi:10.1007/bf00692167

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…Bell et al [19] reported an AVS increase similar to that observed in Jack Lake sediments (Fig. 5) during the establishment of anaerobic reducing conditions in lake sediment after a storm had introduced oxidized sediment.…”

Section: Discussionsupporting

confidence: 66%

Acid-Volatile Sulfide (Avs) in a Seasonally Anoxic Mesotrophic Lake: Seasonal and Spatial Changes in Sediment Avs

Howard

Evans

1993

Environ Toxicol Chem

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Acid-volatile sulfide (AVS) is an operational definition for the sulfides removed from sediment by cold acid extraction. It has been proposed that this fraction could be used as an indicator of divalent metal toxicity (e.g., Cd, Ni, Hg), as it increases the metal-binding capacity of sediments and hence renders metals unavailable to biota. Before AVS can be used as a predictive tool in freshwater systems, we must develop a better understanding of the impact of seasonal turnover events on its geochemistry. An in-depth study of spatial and temporal variation in AVS concentrations in a seasonally anoxic mesotrophic lake is presented. Comparisons are made to AVS in other lakes, with reference to its utilization as a sediment toxicity parameter. Results indicate that AVS increases during anoxic periods and that lake morphology is important due to sediment focusing. Seasonal variations in AVS concentration were observed that may change the potential toxicity of metals in freshwater sediments.

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Section: Discussionsupporting

confidence: 66%

Acid-Volatile Sulfide (Avs) in a Seasonally Anoxic Mesotrophic Lake: Seasonal and Spatial Changes in Sediment Avs

Howard

Evans

1993

Environ Toxicol Chem

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“…The Lake Anna sediment-water interface environment is highly dynamic. Periodic scouring and new sediment deposition at the interface by storm events expose protozoa to low-pH conditions (9) and population washout. After storm events, the protozoan community likely suffers from reduced fecundity as the cellular water-ion balance is disrupted by increased proton concentrations; however, these conditions are short lived.…”

Section: Resultsmentioning

confidence: 99%

Impact of Water Column Acidification on Protozoan Bacterivory at the Lake Sediment-Water Interface

Tremaine

Mills

1991

Appl Environ Microbiol

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Although the impact of acidification on planktonic grazer food webs has been extensively studied, little is known about microbial food webs either in the water column or in the sediments. Protozoon-bacterium interactions were investigated in a chronically acidified (acid mine drainage) portion of a lake in Virginia. We determined the distribution, abundance, apparent specific grazing rate, and growth rate of protozoa over a pH range of 3.6 to 6.5. Protozoan abundance was lower at the most acidified site, while abundance, in general, was high compared with other systems. Specific grazing rates were uncorrelated with pH and ranged between 0.02 and 0.23 h-1, values similar to those in unacidified systems. The protozoan community from an acidified station was not better adapted (P = 0.95) to low-pH conditions than a community from an unacidified site (multivariate analysis of variance on growth rates for each community incubated at pHs 4, 5, and 6). Both communities had significantly lower (P < 0.05) growth rates at pHs 4 and 5 than at pH 6. Reduced protozoan growth rates coupled with high grazing rates and relatively higher bacterial yields (ratio of bacterial-protozoan standing stock) at low pH indicate reduced net protozoan growth efficiency and a metabolic cost of acidification to the protozoan community. However, the presence of an abundant, neutrophilic protozoan community and high bacterial grazing rates indicates that acidification of Lake Anna has not inhibited the bacterium-protozoon link of the sediment microbial food web.

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“…Other types of microbial communities are also known to respond quickly to disturbance. For example, in a study of impoundment sediments, Bell et al (1990) noted that the anaerobic community returned to a normal level of abundance and function within about 14 days after the bed was scoured and covered with 15 cm of fresh, aerobic sediment. The commonality of the 2-week time frame in the present and all of the aforementioned studies suggests this may be a reasonable recovery time for heterotrophic microbes in many productive habitats.…”

Section: Discussionmentioning

confidence: 96%

Soil Bacterial Community Structure Changes Following Disturbance of the Overlying Plant Community

Kang

Mills

2004

Soil Science

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Establishment of anaerobic, reducing conditions in lake sediment after deposition of acidic, aerobic sediment by a major storm

Cited by 12 publications

References 34 publications

Acid-Volatile Sulfide (Avs) in a Seasonally Anoxic Mesotrophic Lake: Seasonal and Spatial Changes in Sediment Avs

Acid-Volatile Sulfide (Avs) in a Seasonally Anoxic Mesotrophic Lake: Seasonal and Spatial Changes in Sediment Avs

Impact of Water Column Acidification on Protozoan Bacterivory at the Lake Sediment-Water Interface

Soil Bacterial Community Structure Changes Following Disturbance of the Overlying Plant Community

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