Coupling between sulfur recycling and syndepositional carbonate dissolution: evidence from oxygen and sulfur isotope composition of pore water sulfate, South Florida Platform, U.S.A.

Ku, Timothy C.W.; Walter, Lynn M.; Coleman, Max; Blake, Ruth E.; Martini, Anna M.

doi:10.1016/s0016-7037(99)00115-5

Cited by 188 publications

(151 citation statements)

References 81 publications

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“…Much higher CaCO 3 cycling both in terms of production and dissolution was observed in P. oceanica meadows compared to unvegetated sediments. Enhanced CaCO 3 dissolution in seagrass vegetated sediments compared to adjacent unvegetated sediments has been documented in Thalassia testudium meadows of the Bahamas (Morse et al 1987;Burdige and Zimmerman 2002) and in mixed meadows of Florida Bay (Ku et al 1999;Halley 2003, 2006). The enhanced CaCO 3 dissolution in seagrass meadows is attributed to intensified sediment metabolic activity related to higher organic carbon availability, O 2 diffusion from rhizomes to pore waters (Ku et al 1999;Burdige and Zimmerman 2002), or sulfate reduction (Ku et al 1999;Yates and Halley 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Enhanced CaCO 3 dissolution in seagrass vegetated sediments compared to adjacent unvegetated sediments has been documented in Thalassia testudium meadows of the Bahamas (Morse et al 1987;Burdige and Zimmerman 2002) and in mixed meadows of Florida Bay (Ku et al 1999;Halley 2003, 2006). The enhanced CaCO 3 dissolution in seagrass meadows is attributed to intensified sediment metabolic activity related to higher organic carbon availability, O 2 diffusion from rhizomes to pore waters (Ku et al 1999;Burdige and Zimmerman 2002), or sulfate reduction (Ku et al 1999;Yates and Halley 2006). The first two processes are assumed to be positively related to aboveground seagrass production (Burdige and Zimmerman 2002), while the last is negatively related to shoot density and root biomass (Holmer et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Holmer et al (2003) reported that sulfate reduction is the dominant anaerobic degradation pathway in sediments around the Mallorca Island, Spain. Sulfide oxidation in the suboxic and oxic sediment layers can drive CaCO 3 dissolution due to the buildup of protons from the oxidation of H 2 S (e.g., Ku et al 1999;Ogrinc et al 2003). A simple stoichiometry of sulfate reduction is given by:…”

Section: Discussionmentioning

confidence: 99%

“…The high production and input of organic carbon make seagrass meadows sites of elevated microbial activity, as well as enhanced animal abundance, which result in high heterotrophic activity (Hemminga and Duarte 2000;Middelburg et al 2005). In addition to their important metabolic activity, seagrass meadows also support high calcium carbonate (CaCO 3 ) production (cf., Canals and Ballesteros 1997;Gattuso et al 1998;Gacia et al 2003) and dissolution (Morse et al 1987;Ku et al 1999;Burdige and Zimmerman 2002). Seagrass meadows are sites of intense organic and inorganic carbon fluxes.…”

Section: Introductionmentioning

confidence: 99%

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Organic carbon metabolism and carbonate dynamics in a Mediterranean seagrass (Posidonia oceanica), meadow

Barrón

Duarte

Frankignoulle

et al. 2006

Estuaries and Coasts

112

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We measured monthly dissolved oxygen (DO) changes in situ benthic incubations from March 2001 to October 2002 in a Posidonia oceanica meadow and unvegetated sediments of Magalluf Bay (Mallorca Island, Spain) to determine gross primary production (GPP), community respiration (R), and net community production (NCP). From June 2001 to October 2002, we also measured fluxes of dissolved inorganic carbon (DIC) and total alkalinity (TAlk). The yearly integrated metabolic rates based on DO changes show that the P. oceanica communities are net autotrophic while the metabolic rates in the unvegetated benthic communities are nearly balanced. Higher calcium carbonate (CaCO 3 ) cycling, both in terms of production and dissolution, was observed in P. oceanica communities than in unvegetated benthic communities. In the P. oceanica meadow, the annual release of CO 2 from net CaCO 3 production corresponds to almost half of the CO 2 uptake by NCP based on DIC incubations. In unvegetated benthic communities, the annual uptake of CO 2 from net CaCO 3 dissolution almost fully compensates the CO 2 release by NCP based on DIC incubations. CaCO 3 dynamics is potentially a major factor in CO 2 benthic fluxes in seagrass and carbonate-rich temperate coastal ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Organic carbon metabolism and carbonate dynamics in a Mediterranean seagrass (Posidonia oceanica), meadow

Barrón

Duarte

Frankignoulle

et al. 2006

Estuaries and Coasts

112

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“…Organic acids may also be consumed through fermentation and sulfate reduction, by which CO 2 and end products such as ethanol, acetic, and lactic acids are produced. Sulfate reduction results in the net production of acidity due to the tight coupling between sulfide oxidation and sulfate reduction, which is balanced by diel fluctuations in seagrass O 2 release (Ku et al 1999;Burdige and Zimmerman 2002;Hu and Burdige 2007).…”

mentioning

confidence: 99%

The role of organic acid exudates in liberating phosphorus from seagrass‐vegetated carbonate sediments

Long

McGlathery

Zieman

et al. 2008

Limnology & Oceanography

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Sediment-bound phosphorus (P) is a potential nutrient source for P-limited seagrasses inhabiting carbonate sediments. We explored the role of organic acid (OA) exudation by seagrasses in liberating mineral P from carbonate sediments. Organic acids can act to increase available P by dissolving carbonate sediment, competing with P for binding sites and complexing dissolution end products, and also by fueling microbial processes that change pore-water pH. We used dialysis tubing placed around individual roots in situ to quantify dissolved species immediately adjacent to roots (root zone) and compared these to bulk pore-water concentrations in vegetated and nonvegetated sediments. Total OA concentrations were highest in the root zone (29.8 6 1.8 mmol L 21 ) compared to bulk measures of 15.5 6 1.9 and 7.5 6 0.6 mmol L 21 in vegetated and nonvegetated sediments, respectively. Phosphate concentrations were also highest in the root zone and were linearly related to OA concentrations (R 2 5 0.63). Organic acid concentrations increased along a seagrass productivity gradient, and ratios of OA concentrations to productivity showed a significant response to a gradient in P-limitation of seagrasses. Organic acid concentrations found in and around roots, compared to those found in bulk sediment measures, indicate that seagrasses are a significant source of OA. Sampling at small spatial scales (mm) immediately adjacent to the roots is critical, because bulk sediment pore-water measures did not capture the observed fluctuations caused by the rapid reaction and consumption of OA in the sediment. Root-zone processes can liberate considerable quantities of P, and OA exudates likely contribute significantly to the success of T. testudinum in P-limited environments.

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Hardened faecal pellets as a significant component in deep water, subtropical marine environments

Deik

Reuning

Petrick

et al. 2019

The Depositional Record

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Non‐skeletal carbonate grains are classically interpreted to form in shallow, tropical environments. Peloids deposited in deep, subtropical marine conditions are poorly studied. IODP site U1460 on the subtropical Carnarvon Ramp (Southwest Shelf of Australia) recovered a nearly continuous Pliocene to Recent record of outer shelf and slope sediments. The relative abundance of peloids varies between 0% and 67% of the fine to medium sand fraction, and contributes on average ~4% of all grains. The origin and composition of these peloids were investigated using scanning electron microscopy equipped with an energy‐dispersive X‐ray spectrometer, light microscopy, X‐ray diffraction and stable isotope analysis. The peloids have a uniform size and shape and are interpreted as faecal pellets. They are mainly composed of skeletal fragments such as ascidian spicules, planktic foraminifera and sponge spicules in a mud‐sized matrix containing abundant coccolith plates. Mineralogical analysis show that the pellets consist of aragonite, calcite and dolomite. The pellets have an identical mineralogical composition and skeletal assemblage as the surrounding matrix, indicating that they have formed in situ. They occur more abundantly during interglacials when the site was situated in deeper waters below the swell wave base, presumably because the pellets were protected from disintegration and therefore available for cementation. The presence of framboidal pyrite within the pellets indicates bacterial sulphate reduction (BSR). The reduction of iron by hydrogen sulphide produced during BSR decreases the pH and likely explains the observed aragonite dissolution. Aragonite dissolution likely increases the alkalinity, and in consequence causes the precipitation of calcite and dolomite cements. It is suggested here that pellets are hardened due to this early cementation close to the sea floor increasing the potential for preservation in the fossil record.

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Coupling between sulfur recycling and syndepositional carbonate dissolution: evidence from oxygen and sulfur isotope composition of pore water sulfate, South Florida Platform, U.S.A.

Cited by 188 publications

References 81 publications

Organic carbon metabolism and carbonate dynamics in a Mediterranean seagrass (Posidonia oceanica), meadow

Organic carbon metabolism and carbonate dynamics in a Mediterranean seagrass (Posidonia oceanica), meadow

The role of organic acid exudates in liberating phosphorus from seagrass‐vegetated carbonate sediments

Hardened faecal pellets as a significant component in deep water, subtropical marine environments

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