Decomposition of plankton-derived dissolved organic matter in permeable coastal sediments

Chipman, Lindsay; Podgorski, David C.; Green, Stefan J.; Kostka, Joel E.; Cooper, William T.; Huettel, Markus

doi:10.4319/lo.2009.55.2.0857

Cited by 38 publications

(35 citation statements)

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“…Carbon budget showing excess 13 C within sediment organic carbon at 0-2 cm, 2-5 cm, and 5-10 cm at each sampling time, and the cumulative excess 13 C lost via fluxes of DIC and DOC from the end of 13 C-labeling until each sampling time, as a percentage of the 13 C initially incorporated into sediment organic carbon (mean 6 SE). questionable because, rather than faithfully reflecting its source, preferential use of more labile DOC components within sediments (Chipman et al 2010) can result in fluxes of DOC being composed of a very enriched (e.g., carbohydrates) or depleted (e.g., lipids) fraction of the source organic matter .…”

Section: Discussionmentioning

confidence: 99%

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Oakes

Eyre

Middelburg

2012

Limnology & Oceanography

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Microphytobenthos (MPB) in photic sediments are highly productive but the fate of this production remains uncertain. Over 33 d, tracing of 13 C from added bicarbonate in subtropical shallow subtidal sand showed rapid transfer of MPB-derived carbon to deeper sediment; below 2 cm (31% within 60 h) and 5 cm (18%). Despite their high turnover (5.5 d) and only representing , 8% of sediment organic carbon, MPB represented up to 35% of the 13 C retained in sediments, demonstrating substantial carbon recycling. Carbon was rapidly transferred to heterotrophs, but their contribution to sediment 13 C was similar to their biomass contribution (, 0.1% to 3.8%), with the exception of the foraminifera Cellanthus craticulatus, which accounted for up to 33% of the 13 C within sediment. There was little loss of MPB-derived carbon via dissolved organic carbon (DOC) effluxes (3%) or resuspension (minimal). Respiration was the major loss pathway (63%), reflecting the high microbial biomass typical of lower latitudes. Given that MPB take up dissolved inorganic carbon (DIC) from overlying water, and the carbon they fix is released as DIC, MPB in subtropical sands are unlikely to substantially alter the form of carbon transported offshore (i.e., there is no conversion to DOC), but processing within the sediment may alter its d 13 C value. Given that 31% of fixed carbon remained in sediments after 33 d, subtropical sands may act as a carbon sink, thereby affecting the quantity of carbon transported offshore.

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Section: Discussionmentioning

confidence: 99%

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Oakes

Eyre

Middelburg

2012

Limnology & Oceanography

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“…While the general sediment bacterial community utilizes diatom EPS (with no temporal distinction, contrary to the predictions of Bellinger et al 2009), we have provided evidence supporting earlier work that some taxa might be considered EPS specialists (e.g., Acinetobacter; Hanlon et al 2006;Haynes et al 2007). The physical structured nature of biofilms increases the likelihood that these sediment systems will support many potential species-species interactions (Croft et al 2005;Chipman et al 2010;Teeling et al 2012), whereas studies of freshwater-lake biofilms have shown diatom EPS production to be positively influenced by the presence of particular bacteria (Bruckner et al 2011). We have recently shown that different, more insoluble, EPS fractions produced by estuarine MPB are preferentially degraded in anaerobic compared to aerobic conditions (McKew et al 2013).…”

Section: Heterotrophic Utilization Of Ceps By Diatoms In the Dark-mentioning

confidence: 99%

“…Bacteroidetes, Alphaproteobacteria, and Gammaproteobacteria play a part in the degradation of DOC and EPS in estuaries (Haynes et al 2007;Webster et al 2010), and have been shown to form associations with marine diatoms (Grossart et al 2005). Shifts in natural bacterial communities are caused by the addition of EPS (Haynes et al 2007;Li et al 2011), which have been tracked by adding 13 C-labeled algal dissolved organic matter followed by deoxyribonucleic acid (DNA)-SIP or ribonucleic acid (RNA)-SIP (Chipman et al 2010). There is some evidence that benthic diatoms utilize dissolved carbohydrates present in the environment surrounding their cells (Smith and Underwood 2000;de Brouwer and Stal 2002).…”

mentioning

confidence: 99%

Microphytobenthic extracellular polymeric substances (EPS) in intertidal sediments fuel both generalist and specialist EPS‐degrading bacteria

Taylor

McKew

Kuhl

et al. 2013

Limnology & Oceanography

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Microphytobenthic biofilms contain high concentrations of carbohydrate-rich extracellular polymeric substances (EPS) that are important in sediment carbon cycling. Field measurements at two locations in the Colne Estuary, U.K., showed that a significant curvilinear relationship explained 50% of the variability in chlorophyll a and EPS content. Estimates of EPS production, based on field data and published rates of production by diatoms, revealed that EPS turnover of 52% to 369% over the tidal cycle was required to account for field standing stocks. We investigated EPS degradation in sediment slurries using purified 13 C-EPS produced by the diatom Nitzschia tubicola. Although EPS constituted only 5% of the sediment dissolved organic carbon (DOC) pool, 100% of the added EPS was utilized within 30 h, before decreases in other sediment-carbohydrate fractions and DOC concentrations. A general 13 C enrichment of phospholipid fatty acids (PLFAs), representative of Gram-positive and Gram-negative bacteria, occurred within 6 h, with the PLFAs a15:0, i15:0, and 18:1v7c being highly enriched. The diatom PLFA 20:5v3 had relatively low but significant 13 C enrichment. Stable isotope probing of 16S ribosomal ribonucleic acid (RNA-SIP) at 30 h revealed 13 C-enriched sequences from the diatom genus Navicula; further evidence that diatoms assimilated the EPS, or EPS-breakdown products, from other diatom taxa. RNA-SIP also demonstrated a diverse range of highly 13 C-enriched bacterial taxa, including a distinct subset (Alphaproteobacteria and Gammaproteobacteria) found only in the heavily labeled microbial assemblages. Thus, cycling of diatom EPS is rapid, and involves a wide range of microbial taxa, including some apparent specialists.

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“…The zone of elevated DOC concentrations is, however, relatively narrow. This may be due to a fast recirculation of remineralization products to the water column (Chipman et al, 2010;Ehrenhauss et al, 2004;Seidel et al, 2015). Furthermore, sampling took place several weeks after the main spring phytoplankton bloom, which started at the beginning of March, as reflected in sharply decreasing silicate concentrations at a nearby permanently installed time series station (similar measurements are described in Grunwald et al (2010) and Beck and Brumsack (2012)).…”

Section: Spatial Differences In Organic Matter Sources and Turnover Rmentioning

confidence: 99%

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

et al. 2017

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This study addresses key processes in high-energy beach systems using an interdisciplinary approach. We assess spatial variations in subsurface pore water residence times, salinity, organic matter (OM) availability, and redox conditions and their effects on nutrient cycles as well as on microbial community patterns and microphytobenthos growth. At the study site on Spiekeroog Island, southern North Sea, beach hydrology is characterized by the classical zonation with an upper saline plume (USP), a saltwater wedge, and a freshwater discharge tube in between. Sediment and pore water samples were taken along a cross-shore transect from the dunes to the low-water line reaching sediment depths down to 5 m below sediment surface. Spatial variations in pore water residence time, salinity, and organic matter availability lead to steep redox and nutrient gradients. Vertical and horizontal differences in the microbial community indicate the influence of these gradients and salinity on the community structure. shoreline. We propose that this nutrient efflux triggers growth of microphytobenthos on sediment surfaces of the discharge zone. A first comparison of nutrient discharge rates of the beach site with a nearby sandy backbarrier tidal flat margin indicates that the beach system might be of less importance in supplying recycled nutrients to nearshore waters than the backbarrier tidal flat area.

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Decomposition of plankton-derived dissolved organic matter in permeable coastal sediments

Cited by 38 publications

References 0 publications

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Microphytobenthic extracellular polymeric substances (EPS) in intertidal sediments fuel both generalist and specialist EPS‐degrading bacteria

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

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Decomposition of plankton-derived dissolved organic matter in permeable coastal sediments

Cited by 38 publications

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Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A 13C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A 13C‐labeling study

Microphytobenthic extracellular polymeric substances (EPS) in intertidal sediments fuel both generalist and specialist EPS‐degrading bacteria

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

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Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study

Transformation and fate of microphytobenthos carbon in subtropical shallow subtidal sands: A ¹³C‐labeling study