Role of pelletization in mineralization of fine-grained coastal sediments

Wild, Christian; Røy, Hans; Huettel, Markus

doi:10.3354/meps291023

Cited by 22 publications

(17 citation statements)

References 28 publications

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“…This covariation has been reported in the literature, although the causality was ambiguous, with lability expressed as chlorophyll a concentration (Danovaro et al 1994;Van Duyl and Kop 1994). This covariation might also explain the observed higher bacterial abundances in ingested sediments, as compared with surrounding sediments, for the deposit feeders Abarenicola pacifica (Plante and Jumars 1993), Arenicola marina (Andresen and Kristensen 2002), and Heteromastus filiformis (Neira and Hö pner 1994;Wild et al 2005).…”

Section: Discussionsupporting

confidence: 64%

“…This amount is much lower than our estimate of 21% (Table 1). However, after sediment ingestion and passage through the digestive tract, the fecal casts of H. filiformis are usually still several times enriched in organic carbon, nitrogen, and protein content relative to the bulk sediment at feeding depth, which clearly shows selective feeding capabilities of H. filiformis (Neira and Hö pner 1994;Wild et al 2005). If these worms select preferentially reactive organic matter with high bacterial abundance, this selection could account for the observed high contribution of bacterial carbon, as compared with the contributions based on indiscriminate feeding, in the budget calculations.…”

Section: Discussionmentioning

confidence: 99%

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The trophic significance of bacterial carbon in a marine intertidal sediment: Results of an in situ stable isotope labeling study

et al. 2006

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We report the results of an in situ tracer experiment in an intertidal sediment, where bacterial carbon was tagged with stable carbon-isotope label, after the injection of 13 C-glucose. The appearance of label in bacteria (based on label incorporation in bacteria-specific, phospholipid-derived fatty acids) and subsequent transfer to meiobenthos (group level) and macrobenthos (species level) was followed for 36 days. The label dynamics of benthic taxa were either fitted with a simple-isotope model or evaluated against enrichment in bacteria, to derive the importance of bacterially derived carbon for the meiobenthos and macrobenthos. Although selective uptake of bacteria was evident, as 2.4 times more bacterial carbon was grazed as expected from indiscriminate feeding, bacterial carbon accounted on average for only 0.08 and 0.11 of the carbon requirements of meiobenthic and macrobenthic taxa, respectively. Additionally, the contribution of bacterial carbon to total carbon requirements did not depend on the living/feeding depth in the sediment or organism size (evaluated over a size range of four orders of magnitude). The observed overall low contribution of bacterial carbon implies that most intertidal benthic fauna depend primarily on other carbon resources that may assert a stronger control on the structure of intertidal-sediment communities.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

The trophic significance of bacterial carbon in a marine intertidal sediment: Results of an in situ stable isotope labeling study

et al. 2006

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“…While most biodiffusors and regenerators simply move organic particles around through burrowing activities, the upward and downward conveyors in most cases ingest organic particles and move them through their guts (Table 1). Particle se lectivity and gut passage may alter the chemical and physical properties of the receiving environment (Neira & Hopner 1993, Wild et al 2005. Labile organic particles from surface sediments delivered as biodeposits in subsurface sediments and vice versa may therefore modify the overall biogeochemical reactivity of the sediment and thus its biological functioning.…”

Section: Reworking and Biomixing Consequencesmentioning

confidence: 99%

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

Kristensen

Penha‐Lopes²,

Delefosse

et al. 2012

Mar. Ecol. Prog. Ser.

719

489

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The term 'bioturbation' is frequently used to describe how living organisms affect the substratum in which they live. A closer look at the aquatic science literature reveals, however, an inconsistent usage of the term with increasing perplexity in recent years. Faunal disturbance has often been referred to as particle reworking, while water movement (if considered) is re ferred to as bioirrigation in many cases. For consistency, we therefore propose that, for contemporary aquatic scientific disciplines, faunal bioturbation in aquatic environments includes all transport processes carried out by animals that directly or indirectly affect sediment matrices. These processes include both particle reworking and burrow ventilation. With this definition, bioturbation acts as an 'umbrella' term that covers all transport processes and their physical effects on the substratum. Particle reworking occurs through burrow construction and maintenance, as well as ingestion and defecation, and causes biomixing of the substratum. Organic matter and microorganisms are thus displaced vertically and laterally within the sediment matrix. Particle reworking animals can be categorized as biodiffusors, upward conveyors, downward conveyors and regenerators depending on their behaviour, life style and feeding type. Burrow ventilation occurs when animals flush their open-or blind-ended burrows with overlying water for respiratory and feeding purposes, and it causes advective or diffusive bioirrigation ex change of solutes between the sediment pore water and the overlying water body. Many bioturbating species perform reworking and ventilation simultaneously. We also propose that the effects of bioturbation on other organisms and associated processes (e.g. microbial driven biogeochemical transformations) are considered within the conceptual framework of ecosystem engineering.

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“…Faecal pellets deposited in situ may typically have nominal diameters of hundreds of µm (e.g. Watling 1988;Wild et al, 2005).…”

Section: Setup Of Model Simulationsmentioning

confidence: 99%

“…Several studies have compared the organic matter concentrations in faecal pellets to those from bulk surface sediment (Kristensen and Pilgaard, 2001;Wild et al, 2005). After adjustment for dry weight, the pellets are typically enriched by 11-13 times the OM 9 concentration in the sediment.…”

Section: Setup Of Model Simulationsmentioning

confidence: 99%

Formation of iron sulfide at faecal pellets and other microniches within suboxic surface sediment

Stockdale

Davison

Zhang

2010

Geochimica et Cosmochimica Acta

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Faecal pellet deposition and bioturbation may lead to heterogeneously distributed particles of localized highly reactive organic matter (microniches) being present below the oxygen penetration depth. Where O 2 , NO 3 -, and Fe/Mn oxyhydroxides become depleted within these microniches or where they exist in zones of sulfate reduction, significant localized peaks in sulfide concentration can occur. These discrete zones of sulfide evolution can cause formation of iron sulfides that would not be predicted by analysis of the bulk sediment.Using a reaction-transport model developed specifically for investigating spherical microniches, and incorporating 3D diffusion, we investigated how the rate constants of organic matter (OM) degradation, particle porosity and niche lifetime, affect dissolved sulfide and iron concentrations, and formation of iron sulfide at such niches. For all of the modelled scenarios the saturation index for iron sulfide is positive, indicating favourable conditions for FeS precipitation in all niches. Those simulations within the microniche lifetime range of 2.5 to 5 days gave comparable concentration ratios of sulfide to iron in solution within the niche to experimentally observed values. Our model results provide insight into the mechanisms of preservation of OM, including soft tissue, in the paleo record, by predicting the conditions that result in preferential deposition of precipitates at the edge of microniches. Decreases in porosity, shorter niche lifetimes and increases in OM degradation rate constants, all tend to increase the likelihood that FeS precipitation will preferentially occur at the edges of a niche, rather than uniformly throughout the niche volume.3

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Role of pelletization in mineralization of fine-grained coastal sediments

Cited by 22 publications

References 28 publications

The trophic significance of bacterial carbon in a marine intertidal sediment: Results of an in situ stable isotope labeling study

The trophic significance of bacterial carbon in a marine intertidal sediment: Results of an in situ stable isotope labeling study

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

Formation of iron sulfide at faecal pellets and other microniches within suboxic surface sediment

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