In situ measurements of benthic primary production during emersion: seasonal variations and annual production in the Bay of Somme (eastern English Channel, France)

Migné, Aline; Spilmont, Nicolas; Davoult, Dominique

doi:10.1016/j.csr.2004.06.002

Cited by 94 publications

(99 citation statements)

References 40 publications

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“…In spring, the Arcachon flat represented a net sink of CO 2 of −2.4 g C m −2 day −1 , whereas in summer and early autumn, it acted either as a small source or sink of CO 2 , with 0.1 and −0.2-0.5 g C m −2 day −1 , respectively. Such carbon fluxes are similar to or greater than those computed in the other tidal flats in France and in the Netherlands within a range of −1.9-0.2 g C m −2 day −1 (Migné et al, 2004;Spilmont et al, 2006;Zemmelink et al, 2009). They remained low compared to other tidal systems, such as salt or freshwater marshes with flux values from −0.8 to 0.4 g C m −2 day −1 (Houghton and Woodwell, 1980;Rocha and Goulden, 2008) or as European estuaries that degas large quantities of CO 2 to the atmosphere from 1.2 to 9.1 g C m −2 day −1 in average .…”

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

confidence: 83%

“…Similarly, the floating chamber method has been suspected to artificially enhance the CO 2 exchange across the air-water interface (Raymond and Cole, 2001). CO 2 fluxes at the airsediment interface at low tide can be assessed by deploying benthic chambers (Migné et al, 2002), but this method suffers from variability of intertidal sediment habitat resulting from patchiness at all timescales and particularly from spatial patchiness (Migné et al, 2004). Micrometeorological measurements, especially the Eddy Covariance technique (EC), show potential, as CO 2 fluxes across heterogeneous intertidal areas can be obtained with the same technique, at high tide and low tide (Houghton and Woodwell, 1980;Kathilankal et al, 2008;Zemmelink et al, 2009).…”

Section: P Polsenaere Et Al: Spatial and Temporal Co 2 Exchanges Mementioning

confidence: 99%

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

confidence: 83%

Section: P Polsenaere Et Al: Spatial and Temporal Co 2 Exchanges Mementioning

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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“…To explain the pattern found for mineralization rates along the transect, benthic photosynthesis must increase toward the low waterline and maintain high rates during the inundation of the flat. Measurements of benthic photosynthesis in intertidal Wadden Sea sediments were mostly conducted during exposure (e.g., Colijn and De Jonge 1984;Migne et al 2004) because water turbidity is considered to limit light availability for benthic photosynthesis during inundation. In an in situ study at a nearby intertidal flat at Sylt, where waters were clear, Asmus (1982) showed that microphytobenthos contributed 68% to total primary production during inundation.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal patterns of mineralization rates and oxygen distribution in a permeable intertidal sand flat (Sylt, Germany)

Ulrich

Billerbeck

Polerecký

et al. 2006

Limnology & Oceanography

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Oxygen distribution and benthic mineralization rates were investigated in a permeable intertidal sand flat (permeability: 3.9 3 10 211 m 2 ) in a transect from the low toward the high waterline. At all stations, oxygen penetrated several millimeters to centimeters into the sediments during inundation because of pore-water advection. The wave-and current-driven deep oxygen penetration caused high oxygen consumption rates (OCRs) and high aerobic mineralization rates at all stations. Because oxygen penetration was enhanced during inundation, 71-90% of the daily oxygen consumption took place in that period. OCRs and sulfate reduction rates (SRRs) changed with inundation time of the stations, emphasizing the importance of pore-water advection for benthic mineralization: OCRs were elevated at the lower flat in summer (lower flat 131-187; middle and upper flat 64-108 mmol C m 22 d 21 ). SRRs increased sharply from the high to the low waterline during all seasons (e.g., in summer: lower flat 18-40; middle flat 8.8-9.4, upper flat 0.5-4 mmol C m 22 d 21 ). A one-dimensional model of the advective organic matter supply to the sediment could only explain a fraction of the organic carbon required for benthic mineralization. This suggests that either transport of particles via the seawater is more efficient than the one-dimensional concept can explain or that additional carbon was supplied through other sources (e.g., benthic photosynthesis). Mineralization rates were higher in summer than in winter. Only in summer did sulfate reduction contribute .20% to total mineralization.

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“…Davoult et al, 2009;Hubas et al, 2006;Migné et al, 2011;Migné et al, 2004), its utilization in coupled water-air circuit greatly underestimates community metabolism during immersion. The carbon fluxes reported under submerged conditions by Silva et al (2008) using direct CO 2 measurements need to be reassessed by coupling these measures with measures of pH or alkalinity in order to describe the carbon dioxide system and estimate the DIC fluxes during immersion periods.…”

Section: Calculation Of Community Metabolism Using Dissolved Co 2 Vermentioning

confidence: 99%

Comparative study of methodologies to measure in situ the intertidal benthic community metabolism during immersion

Ouisse

Migné

Davoult

2014

Estuarine, Coastal and Shelf Science

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In situ measurements of benthic primary production during emersion: seasonal variations and annual production in the Bay of Somme (eastern English Channel, France)

Cited by 94 publications

References 40 publications

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

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

Spatial and temporal patterns of mineralization rates and oxygen distribution in a permeable intertidal sand flat (Sylt, Germany)

Comparative study of methodologies to measure in situ the intertidal benthic community metabolism during immersion

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In situ measurements of benthic primary production during emersion: seasonal variations and annual production in the Bay of Somme (eastern English Channel, France)

Cited by 94 publications

References 40 publications

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

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

Spatial and temporal patterns of mineralization rates and oxygen distribution in a permeable intertidal sand flat (Sylt, Germany)

Comparative study of methodologies to measure in situ the intertidal benthic community metabolism during immersion

Contact Info

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

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