Effect of naturally occurring bromophenols on sulfate reduction and ammonia oxidation in intertidal sediments

Giray, C; Gm, King

doi:10.3354/ame013295

Cited by 13 publications

(18 citation statements)

References 14 publications

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“…A 5 • C warming would substantially increase the SRP flux from sediment by 0.27-1.37 g m −2 yr −1 . An increase in SRP concentrations can influence downstream eutrophication potential and changes in carbon quality may impact food webs and microbial metabolism (e.g., Schindler et al, 1971;Godfrey and Mitchell, 1972). Warming may have the potential to influence net nitrogen mineralization in rural watersheds (Brookshire et al, 2011;Butler et al, 2012), but our results regarding warming effects on N fluxes show a larger variability.…”

Section: Discussionmentioning

confidence: 71%

“…Prior studies have shown that ammonia oxidation is coupled to the reductions of Mn oxides, Fe oxides and sulfate under anaerobic conditions (e.g., Giray and King, 1997;Clément et al, 2005;Javanaud et al, 2011). Our hypothesized replacement via sulfate reduction may occur due to increased labile DOC, low redox, and different microbial communities in urban environments.…”

Section: Predicting Interactive Effects Of Land Use and Warming In Stmentioning

confidence: 75%

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Warming increases carbon and nutrient fluxes from sediments in streams across land use

Duan

Kaushal

2013

Biogeosciences

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Rising water temperatures due to climate and land use change can accelerate biogeochemical fluxes from sediments to streams. We investigated impacts of increased streamwater temperatures on sediment fluxes of dissolved organic carbon (DOC), nitrate, soluble reactive phosphorus (SRP) and sulfate. Experiments were conducted at 8 long-term monitoring sites across land use (forest, agricultural, suburban, and urban) at the Baltimore Ecosystem Study Long-Term Ecological Research (LTER) site in the Chesapeake Bay watershed. Over 20 yr of routine water temperature data showed substantial variation across seasons and years. Lab incubations of sediment and overlying water were conducted at 4 temperatures (4 °C, 15 °C, 25 °C, and 35 °C) for 48 h. Results indicated: (1) warming significantly increased sediment DOC fluxes to overlying water across land use but decreased DOC quality via increases in the humic-like to protein-like fractions, (2) warming consistently increased SRP fluxes from sediments to overlying water across land use, (3) warming increased sulfate fluxes from sediments to overlying water at rural/suburban sites but decreased sulfate fluxes at some urban sites likely due to sulfate reduction, and (4) nitrate fluxes showed an increasing trend with temperature at some forest and urban sites but with larger variability than SRP. Sediment fluxes of nitrate, SRP and sulfate were strongly related to watershed urbanization and organic matter content. Using relationships of sediment fluxes with temperature, we estimate a 5 °C warming would increase mean sediment fluxes of SRP, DOC and nitrate-N across streams by 0.27–1.37 g m−2 yr−1, 0.03–0.14 kg m−2 yr−1, and 0.001–0.06 kg m−2 yr−1. Understanding warming impacts on coupled biogeochemical cycles in streams (e.g., organic matter mineralization, P sorption, nitrification, denitrification, and sulfate reduction) is critical for forecasting shifts in carbon and nutrient loads in response to interactive impacts of climate and land use change

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Section: Discussionmentioning

confidence: 71%

Section: Predicting Interactive Effects Of Land Use and Warming In Stmentioning

confidence: 75%

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Duan

Kaushal

2013

Biogeosciences

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“…The tubes were capped and incubated horizontally at ambient laboratory temperature with shaking (100 rpm). At intervals, the tube contents were subsampled and analyzed for nitrite content using a colorimetric method after centrifugation (16). Nitrite production rates were considered equivalent to ammonium oxidation rates.…”

Section: Methodsmentioning

confidence: 99%

Diversity and Structure of Bacterial Chemolithotrophic Communities in Pine Forest and Agroecosystem Soils

Tolli

King

2005

Appl Environ Microbiol

100

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Obligate lithotrophs (e.g., ammonia oxidizers) and facultative lithotrophs (e.g., CO and hydrogen oxidizers) collectively comprise a phylogenetically diverse functional group that contributes significantly to carbon and nitrogen cycles in soils and plays important roles in trace gas dynamics (e.g., carbon monoxide and nitrous and nitric oxides) that affect tropospheric chemistry and radiative forcing. In spite of their diverse physiologies, facultative and obligate lithotrophs typically possess the Calvin-Benson-Bassham cycle enzyme, ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisCO). In an effort designed to understand the structure of lithotrophic communities in soil, genomic DNA extracts from surface (0 to 2 cm) and subsurface (5 to 7 cm) soils have been obtained from two sites in a Georgia agroecosystem (peanut and cotton plots) and an unmanaged pine stand (>50 years old). The extracts have been used in PCR amplifications of the cbbL gene for the rubisCO large subunit protein. cbbL PCR products were cloned, sequenced, and subjected to phylogenetic and statistical analyses. Numerous novel lineages affiliated with the form IC clade (one of four form I rubisCO clades), which is typified by facultative lithotrophs, comprised lithotrophic communities from all soils. One of the form IC clone sequences clustered with a form IC clade of ammonia-oxidizing Nitrosospira. Distinct assemblages were obtained from each of the sites and from surface and subsurface soils. The results suggest that lithotrophic populations respond differentially to plant type and land use, perhaps forming characteristic associations. The paucity of clone sequences attributed to ammonia-oxidizing bacteria indicates that even though ammonia oxidation occurs in the various soils, the relevant populations are small compared to those of facultative lithotrophs.Chemolithotrophic bacteria, which use inorganic compounds as electron donors for growth, have been placed into two groups based on their electron donors (for examples, see reference 34). Obligate lithotrophs include sulfide-, sulfur-, metal-, ammonium-, and nitrite-oxidizing bacteria, many of which have been described in detail. Facultative lithotrophs include aerobic hydrogen-and CO-oxidizing bacteria, of which relatively few have been described (for examples, see references 25 and 26).Although chemolithotrophic bacteria exhibit a wide range of physiological and ecological traits, most use the Calvin-BensonBassham pathway to incorporate CO 2 . Ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisCO) plays a crucial role in this pathway (10,11,30,31). rubisCO occurs in three related forms (I, II, and III) that vary in structure, catalytic properties, and substrate specificity (14,19,38,39,43,46). Form I, which occurs in all chemolithotrophs in the bacterial domain, has been subdivided into four clades, IA to ID, based on phylogenetic analyses (28,38,39,43). Form II occurs in some chemolithotrophs and phototrophs, while form III is an archaeal enzyme (14, 43). Analyses of form I rubisC...

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“…For example, elevated levels of nitrification (26,27) and sulfate reduction (18) have been documented for macrofaunal burrow sediments. Burrows also support higher levels of microbial biomass than do bulk sediments (17,23). In addition, previous studies have shown that N. virens and M. arenaria burrow sediments harbor PAH-degrading bacteria and that degradation rates for added PAHs are greater in burrow sediments than in nonburrow sediments (9).…”

Section: Discussionmentioning

confidence: 99%

“…Animal burrow sediments were collected from the intertidal zone of Lowes Cove during the summer of 1999 with a sterile spatula during low tide. This site and the burrow sediment collection method have been described in detail previously (3,17,18,23,24). Based on PAH assays, the site is not known to be contaminated (PAH concentrations, Ͻ50 ng g [dry weight] of sediment Ϫ1 ).…”

Section: Methodsmentioning

confidence: 99%

Isolation, Characterization, and Polyaromatic Hydrocarbon Degradation Potential of Aerobic Bacteria from Marine Macrofaunal Burrow Sediments and Description ofLutibacterium anuloederansgen. nov., sp. nov., andCycloclasticus spirillensussp. nov

Chung

King

2001

Appl Environ Microbiol

109

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Two new polyaromatic hydrocarbon-degrading marine bacteria have been isolated from burrow wall sediments of benthic macrofauna by using enrichments on phenanthrene. Strain LC8 (from a polychaete) and strain M4-6 (from a mollusc) are aerobic and gram negative and require sodium chloride (>1%) for growth. Both strains can use 2- and 3-ring polycyclic aromatic hydrocarbons as their sole carbon and energy sources, but they are nutritionally versatile. Physiological and phylogenetic analyses based on 16S ribosomal DNA sequences suggest that strain M4-6 belongs to the genus Cycloclasticus and represents a new species, Cycloclasticus spirillensus sp. nov. Strain LC8 appears to represent a new genus and species,Lutibacterium anuloederans gen. nov., sp. nov., within theSphingomonadaceae. However, when inoculated into sediment slurries with or without exogenous phenanthrene, only L. anuloederans appeared to sustain a significant phenanthrene uptake potential throughout a 35-day incubation. In addition, onlyL. anuloederans appeared to enhance phenanthrene degradation in heavily contaminated sediment from Little Mystic Cove, Boston Harbor, Boston, Mass.

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Effect of naturally occurring bromophenols on sulfate reduction and ammonia oxidation in intertidal sediments

Cited by 13 publications

References 14 publications

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Diversity and Structure of Bacterial Chemolithotrophic Communities in Pine Forest and Agroecosystem Soils

Isolation, Characterization, and Polyaromatic Hydrocarbon Degradation Potential of Aerobic Bacteria from Marine Macrofaunal Burrow Sediments and Description ofLutibacterium anuloederansgen. nov., sp. nov., andCycloclasticus spirillensussp. nov

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