Biodegradation of photosynthetically produced extracellular organic carbon from intertidal benthic algae

Goto, Nobuo; Mitamura, Osamu; Terai, Hitoshi

doi:10.1016/s0022-0981(00)00329-4

Cited by 96 publications

(99 citation statements)

References 21 publications

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“…Extracellular compounds (e.g., EPS; Goto et al 2001) can also be a major reservoir for MPB-derived carbon. For example, intraand extracellular carbohydrates together contained 15-30% of the 13 C incorporated into 0-2 cm sediment OC at our site (Oakes et al 2010b).…”

Section: Discussionmentioning

confidence: 99%

“…MPB can affect movement of nutrients, oxygen, and carbon across the sediment-water interface (Cahoon 1999;Eyre and Ferguson 2005). Particularly where nutrients are limited (Cook et al 2007), much of the carbon fixed by MPB is secreted as extracellular polysaccharides (EPS; up to 73% of productivity; Goto et al 2001), primarily carbohydrates (Underwood et al 2004;Oakes et al 2010b). EPS reduces resuspension by stabilizing sediments (Cahoon 1999) and, in addition to direct grazing on MPB, can be a significant labile carbon source for consumers .…”

mentioning

confidence: 99%

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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%

mentioning

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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“…Moreover, incubation time was kept short, which also minimized a possible effect of bacteria. For instance, Goto et al (2001) reported that 2 h after the start of the experiment, 20% of the extracellular material of different fractions produced by natural benthic algae was degraded.…”

Section: Discussionmentioning

confidence: 99%

Production of extracellular polymeric substances (EPS) by benthic diatoms: effect of irradiance and temperature

Wolfstein¹,

Stal²

2002

Mar. Ecol. Prog. Ser.

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“…These high GPP values are associated with high CR values at night due to heterotrophic bacteria (Hubas et al, 2006) and consistent with our observation with the EC at Station 2 (Table 3). In particular, Goto et al (2001) have shown that benthic bacteria can utilize exudates from microphytobenthos. Also, high CR rates can be accounted for by the intense grazing of meiofauna and macrofauna on microphytobenthos, the latter being easily and rapidly transferred toward superior benthic heterotrophic components (Middelburg et al, 2000;Spilmont et al, 2006).…”

Section: Relationship Between Low Tide Co 2 Fluxes and The Distributimentioning

confidence: 99%

Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

et al. 2012

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Abstract. Measurements of carbon dioxide fluxes were performed over a temperate intertidal mudflat in southwestern France using the micrometeorological Eddy Covariance (EC) technique. EC measurements were carried out in two contrasting sites of the Arcachon flat during four periods and in three different seasons (autumn 2007, summer 2008, autumn 2008 and spring 2009). In addition, satellite images of the tidal flat at low tide were used to link the net ecosystem CO 2 exchange (NEE) with the occupation of the mudflat by primary producers, particularly by Zostera noltii meadows. CO 2 fluxes during the four deployments showed important spatial and temporal variations, with the flat rapidly shifting from sink to source with the tide. Absolute CO 2 fluxes showed generally small negative (influx) and positive (efflux) values, with larger values up to −13 µmol m −2 s −1 for influxes and 19 µmol m −2 s −1 for effluxes. Low tide during the day was mostly associated with a net uptake of atmospheric CO 2 . In contrast, during immersion and during low tide at night, CO 2 fluxes where positive, negative or close to zero, depending on the season and the site. During the autumn of 2007, at the innermost station with a patchy Zostera noltii bed (cover of 22 ± 14 % in the wind direction of measurements), CO 2 influx was −1.7 ± 1.7 µmol m −2 s −1 at low tide during the day, and the efflux was 2.7 ± 3.7 µmol m −2 s −1 at low tide during the night. A gross primary production (GPP) of 4.4 ± 4.1 µmol m −2 s −1 during emersion could be attributed to microphytobenthic communities. During the summer and autumn of 2008, at the central station with a dense eelgrass bed (92 ± 10 %), CO 2 uptakes at low tide during the day were −1.5 ± 1.2 and −0.9 ± 1.7 µmol m −2 s −1 , respectively. Night time effluxes of CO 2 were 1.0 ± 0.9 and 0.2 ± 1.1 µmol m −2 s −1 in summer and autumn, respectively, resulting in a GPP during emersion of 2.5 ± 1.5 and 1.1 ± 2.0 µmol m −2 s −1 , respectively, attributed primarily to the seagrass community. At the same station in April 2009, before Zostera noltii started to grow, the CO 2 uptake at low tide during the day was the highest (-2.7 ± 2.0 µmol m −2 s −1 ). Influxes of CO 2 were also observed during immersion at the central station in spring and early autumn and were apparently related to phytoplankton blooms occurring at the mouth of the flat, followed by the advection of CO 2 -depleted water with the flooding tide.Published by Copernicus Publications on behalf of the European Geosciences Union. P. Polsenaere et al.: Spatial and temporal CO 2 exchanges measured by Eddy CovarianceAlthough winter data as well as water carbon measurements would be necessary to determine a precise CO 2 budget for the flat, our results suggest that tidal flat ecosystems are a modest contributor to the CO 2 budget of the coastal ocean.

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Biodegradation of photosynthetically produced extracellular organic carbon from intertidal benthic algae

Cited by 96 publications

References 21 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

Production of extracellular polymeric substances (EPS) by benthic diatoms: effect of irradiance and temperature

Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

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Biodegradation of photosynthetically produced extracellular organic carbon from intertidal benthic algae

Cited by 96 publications

References 21 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

Production of extracellular polymeric substances (EPS) by benthic diatoms: effect of irradiance and temperature

Spatial and temporal CO&lt;sub&gt;2&lt;/sub&gt; exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

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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

Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production