Reduction of marine sediment oxygen uptake: pretreatment for the determination of infaunal respiration rates

Golde, HM; Crosby, Michael P.; Cr, Lovell; Stancyk, SE

doi:10.3354/meps111203

Cited by 3 publications

(2 citation statements)

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“…Experiments showed that a dose of 30 Mrad of γirradiation caused no measurable changes in isotopic signature, chemical composition, crystallographic structure, or homogenization temperatures of fluid inclusions in rocks and minerals analogous to those found on Mars. Recently, the use of γ-irradiation in studies of microbial respiration rates and geochemical reaction rates of natural soils has gained popularity (Golde et al, 1994;Apitz et al, 1999;Getenga et al, 2004;Herbert et al, 2005;Manning et al, 2006). However, descriptions of the effects of moderate doses of ionizing radiation on whole soils or even naturally occurring minerals remain incomplete.…”

Section: Introductionmentioning

confidence: 99%

Effects of gamma-sterilization on the physico-chemical properties of natural sediments

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Effects of gamma-sterilization on the physico-chemical properties of natural sediments

et al. 2008

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“…Carbon availability from phytoplankton appeared to drive SOD, based on the positive correlation between water column chlorophyll a and SOD. The mechanism is likely to be that senescing and settling phytoplankton provide carbon to the benthic microbial community (Golde et al, 1994;Wang et al, 2008). When microalgae, containing chlorophyll a, die and settle on the pond bottom, they are broken down by bacteria (Burford et al, 2004).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Factors driving low oxygen conditions in integrated rice-shrimp ponds

et al. 2019

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Integrated rice-shrimp ponds (IRSPs) are common in areas of Southeast Asia where saltwater intrudes into rice fields in the dry season, enabling rice production in the wet season, and shrimp farming in the dry season or throughout the year. Previous research has highlighted that IRSPs have periods of low dissolved oxygen concentrations which may have a critical effect on shrimp survival. To understand the causes of low dissolved oxygen, this study examined oxygen fluxes at two IRSPs in Ca Mau Province, Vietnam during a two-year period (two wet seasons and two dry seasons). Sediment oxygen demand (SOD) incubations and whole-system oxygen flux measurements were conducted and compared with a range of water and sediment parameters to explain drivers for low oxygen concentrations. A high percentage of oxygen demand at a whole pond scale was from the sediment; hence SOD drove low oxygen concentrations in the water column. SOD rates were significantly positively correlated with chlorophyll a concentrations in the water column. These findings suggested that algal production in the water column, rather than benthic algal production, or other organic loading, provided an organic carbon source driving SOD. Oxygen demand was much higher than oxygen production within the IRSPs, indicating high bacterial activity and low algal production. This study has shed new light

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Effect of Sediment Manipulation on the Biogeochemistry of Experimental Sediment Systems

Porter

Owens

Cornwell

2006

Journal of Coastal Research

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Before biological or biogeochemical experimentation, sediments are often manipulated and defaunated witb tbe use of many different approaches and only modest consideration of treatment effects on sediment biogeochemistry and fluxes. Mesocosm experiments require large quantities of sediment and no standard protocol to defaunate and equilibrate muddy sediments before initiation of experiments has been determined.Using fine-grained sediments, we examined a number of treatments: H) intact witb macroinfauna; (2) intact, macroinfauna individually removed; (3) homogenized surface sediment witb macrofauna; (4) bomogenized deep sediment witbout macroinfauna; and (5) intact deep sediment witbout macroinfauna. In weekly batcb core flux incubations, we measured dissolved oxygen, dinitrogen gas, ammonium (NH,;), nitrate plus nitrite (NO^ f NO,;), silicate (Si), and soluble reactive phospborus (SRP) fluxes over a 5-week period. In addition, we determined porewater ammcmium concentrations over time.Different sediment preparation techniques, witb the same muddy sediment, significantly affected nutrient and gas fluxes, and tbe amount of nutrient and gas fluxes differed between sediment preparation tecbniques. Severely manipulated sediments, sucb as homogenized treatments, had high initial effluxes but eventually equilibrated to lower and more constant nutrient and gas fluxes. Moreover, biogeocbemical flux cbanges for all treatments became similar after about 2 to 3 weeks. Sieved sediments exbibited low fluxes over tbe entire 5-week period, and flux rates did not cbange over time. A feasible method for sediment preparation for mesocosm studies is to use bomogenized deep sediment equilibrated over an almost 2-week period. Overall, sediment preparation and tbe time after sediment manipulation affect sediment biogeochemical processes and must be considered before initiating experiments.

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Reduction of marine sediment oxygen uptake: pretreatment for the determination of infaunal respiration rates

Cited by 3 publications

References 17 publications

Effects of gamma-sterilization on the physico-chemical properties of natural sediments

Effects of gamma-sterilization on the physico-chemical properties of natural sediments

Factors driving low oxygen conditions in integrated rice-shrimp ponds

Effect of Sediment Manipulation on the Biogeochemistry of Experimental Sediment Systems

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