Diffusion of organic and inorganic solutes through macrofaunal mucus secretions and tube linings in marine sediments

Hannides, Angelos K.; Dunn, Shannon M.; Aller, Robert C.

doi:10.1357/002224005774464193

Cited by 30 publications

(22 citation statements)

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“…The presence of tubes and burrows increases the sediment surface area (i.e., m 2 burrow surface area m 22 surface sediment) available for diffusive exchange 1-5 times relative to the sediment surface alone (Davey 1994). However, burrow walls should not be viewed simply as an extension of the sediment-water interface because physico-chemical properties such as redox conditions (Aller 1994), diffusion scales (Gilbert et al 2003), diffusive permeability (Hannides et al 2005), solute gradients (Meyers et al 1987), and organic matter content (Papaspyrou et al 2005) may be quite different in burrow walls relative to surface sediments. Irrigation and feeding activities of infauna also supply oxidants and reactive substrates deep into sediments, thus influencing solute exchange and enhancing total microbial metabolism by stimulating oxic and suboxic organic matter remineralization (see review by Kristensen and Kostka 2005).…”

Section: Discussionmentioning

confidence: 99%

Geochemical ecosystem engineering by the mud shrimp Upogebia pugettensis (Crustacea: Thalassinidae) in Yaquina Bay, Oregon: Density‐dependent effects on organic matter remineralization and nutrient cycling

D’Andrea

DeWitt

2009

Limnology & Oceanography

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We investigated the effect of the thalassinid mud shrimp Upogebia pugettensis on organic matter and nutrient cycling on Idaho Flat, an intertidal flat in the Yaquina River estuary, Oregon. Field studies were conducted to measure carbon and nitrogen remineralization rates and benthic fluxes relative to shrimp population density. Organic carbon remineralization rates estimated from incubations increased with burrow density. Similarly, benthic oxygen uptake increased linearly with burrow density. Shrimp bioirrigation enhanced carbon remineralization up to 2.9 times; its effects on nitrogen cycling were even more dramatic, enhancing ammonification rates up to 7 times, nitrification rates between 3 and 9 times, and estimated denitrification up to 4 times relative to portions of the tide flat lacking shrimp. Bioirrigation by shrimp also reduced pore-water inventories of dissolved inorganic nitrogen (DIN), resulting in DIN fluxes that increased exponentially with burrow density up to 15-fold relative to No-shrimp plots. For both C and N fluxes, the strongest densitydependent relationships occurred with burrow hole density rather than shrimp population density or biomass. Combined with population mapping of mud shrimp populations on Idaho Flat, we estimate that total areal C and DIN effluxes on the tide flat were enhanced 1.9 and 3.7 times, respectively, relative to areal fluxes expected if no shrimp were present. Mud shrimp thus perform as geochemical ecosystem engineers that strongly affect the flux and fate of C and N in Pacific estuaries.

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Section: Discussionmentioning

confidence: 99%

Geochemical ecosystem engineering by the mud shrimp Upogebia pugettensis (Crustacea: Thalassinidae) in Yaquina Bay, Oregon: Density‐dependent effects on organic matter remineralization and nutrient cycling

D’Andrea

DeWitt

2009

Limnology & Oceanography

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“…Furthermore, this is consistent with the lower sediment resuspension in the final erosion experiment at the high cockle density compared to the medium cockle density (see below). The hypothesis that mucus production by molluscs acts to bind sediment particles is supported by the study of Hannides et al (2005), who showed that the marine snails Neverita duplicata and Euspira heros crawling over glass beads increased the cohesiveness of the beads compared to clean beads. Detailed examination of the 8 tidal cycles corresponding to the 3rd and 4th days of the experiment gives more insight into the erosion and deposition processes occurring during each tidal-current cycle.…”

Section: Sediment Destabilisation By Cocklesmentioning

confidence: 96%

Influence of cockle Cerastoderma edule bioturbation and tidal-current cycles on resuspension of sediment and polycyclic aromatic hydrocarbons

Ciutat¹,

Widdows²,

Readman³

2006

Mar. Ecol. Prog. Ser.

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Experiments were performed to investigate the impact of cockle population density Cerastoderma edule on the resuspension of naturally contaminated sediments collected from the Tamar estuary (SW England). Annular flumes generated tidal-current cycles for 7 to 9 d. The suspended sediment concentration (SSC) at peak flow increased 5-fold with increasing cockle population density, although the 2 highest densities yielded similar resuspension. Polycyclic aromatic hydrocarbons (PAHs) in the sediment were analysed by gas chromatography/mass spectrometry (GC/MS) at the beginning of the experiment, and in the water column of each flume after 2 and 6 d at both the maximum and minimum current speeds. At the end of each experiment sediment erodability was measured as a function of a stepwise increase in current speed. Sediment erosion increased up to 10-fold with increasing cockle population density. However, at the highest density the SSC was lower than that observed for the medium density, probably due to binding resulting from higher mucus secretion and pseudofaeces production. Current-induced resuspension of contaminated sediment was dependent on the density of the cockles. The correlation between the suspended sediment concentrations and the concentrations of PAH was weak for low molecular weight PAHs (phenanthrene and anthracene) due to their higher water solubility. In contrast, higher molecular weight PAHs (fluoranthene, pyrene, benz(a)anthracene and chrysene) showed a strong correlation with suspended particulates as a result of their higher hydrophobicity.

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“…The reduction of the initial bSiO 2 dissolution rate with increasing TEP content, as well as elevated dSi concentrations in aggregate pore water, imply that TEP may play a role in decreasing dSi flux out of aggregates and therefore the initial bSiO 2 dissolution rate of aggregated diatoms. A reduction of the diffusion of solutes through mucus-coated sediments compared to sediments in free solution has been attributed to both size and charge inhibition due to mucus (Hannides et al 2005). Porous sediments covered with TEP-like mucus are to some extent comparable to marine snow-sized aggregates, although the porosity of aggregates is much higher.…”

Section: Transparent Exopolymer Particlesmentioning

confidence: 99%

Evidence for reduced biogenic silica dissolution rates in diatom aggregates

Moriceau¹,

Garvey²,

Ragueneau³

et al. 2007

Mar. Ecol. Prog. Ser.

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International audienceBecause aggregated diatoms sink rapidly through the water column, leaving little time for dissolution, aggregation influences the balance between recycling of biogenic silica (bSiO2) and its sedimentation and preservation at the seafloor. Additionally, aggregation may directly impact dissolution rates of opal. Laboratory experiments were conducted to investigate the influence of aggregation on bSiO2 dissolution rates using 3 different batch cultures of the diatoms Chaetoceros decipiens, Skeletonema costatum, and Thalassiosira weissflogii. Specific dissolution rates of bSiO2 of aggregated and freely suspended diatoms were compared. Additionally, the influences of the dissolved silicon (dSi) concentration in the pore water of aggregates, the viability of diatoms, and the concentrations of transparent exopolymer particles (TEP) and of bacteria on bSiO2 dissolution rates were determined. Initial specific dissolution rates of diatom frustules were significantly lower for aggregated diatoms (2.9% d–1) than for freely suspended diatoms (6.6% d–1). Lower specific dissolution rates in aggregates were attributed to elevated dSi concentrations in aggregate pore water (maximum 230 vs. 20 µmol l–1) and to the fact that aggregated diatoms remained viable for longer than freely suspended diatoms. Specific bSiO2 dissolution was significantly correlated to viability of cells independent of treatment. Bacterial concentrations in both treatments appeared high enough, so that after cell death the coating protecting the silica frustule was degraded without measurable delay. The TEP content of aggregates appeared to affect dissolution rates, possibly by retaining solutes within aggregates

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Diffusion of organic and inorganic solutes through macrofaunal mucus secretions and tube linings in marine sediments

Cited by 30 publications

References 0 publications

Geochemical ecosystem engineering by the mud shrimp Upogebia pugettensis (Crustacea: Thalassinidae) in Yaquina Bay, Oregon: Density‐dependent effects on organic matter remineralization and nutrient cycling

Geochemical ecosystem engineering by the mud shrimp Upogebia pugettensis (Crustacea: Thalassinidae) in Yaquina Bay, Oregon: Density‐dependent effects on organic matter remineralization and nutrient cycling

Influence of cockle Cerastoderma edule bioturbation and tidal-current cycles on resuspension of sediment and polycyclic aromatic hydrocarbons

Evidence for reduced biogenic silica dissolution rates in diatom aggregates

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