Study of Annual and Seasonal Dissolved Inorganic Nitrogen Inputs into the Arcachon Lagoon, Atlantic Coast (France)

Rimmelin, Peggy; Dumon, Jonathan; Maneux, Eric; Gonçalves, Alex Augusto

doi:10.1006/ecss.1998.0384

Cited by 42 publications

(32 citation statements)

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“…Located in Southwest France, the catchment, with a surface of 3001 km 2 , is lowland (slopes below 0.25%) and relatively homogeneous topographically, climatically and geologically. The soils are composed of sandy podzols of Pleistocene origin, primarily covered by maritime pine forest (Trichet et al, 1997), crossed by a shallow, multi-layered, permeable aquifer, not deeper than 3 m, and with a maximum thickness less than 25 m (Rimmelin et al, 1998). Soils are characterised by high acidity (pH 4-5), low inorganic nutrients availability, organic matter reaching 15% (Jolivet et al, 2007) and a near absence of carbonate rocks, except a few Miocene carbonated outcrops in the Leyre catchment (Folliot et al, 1993).…”

Section: Study Sitementioning

confidence: 99%

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

Polsenaere

Abril

2012

Geochimica et Cosmochimica Acta

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Section: Study Sitementioning

confidence: 99%

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

Polsenaere

Abril

2012

Geochimica et Cosmochimica Acta

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“…During a tidal cycle, the flat exchanges approximately 264 × 10 6 m 3 and 492 × 10 6 m 3 of water with the ocean during average neap and spring tides, respectively. The flat also receives freshwater, but to a lesser extent, with an annual input of 1.25 × 10 9 m 3 (1.8 × 10 6 m 3 at each tidal cycle), of which 8 % is from groundwater, 13 % is from rainfall and 79 % is from rivers and small streams (Rimmelin et al, 1998). Water temperatures in the bay vary from 6 • C in winter to 22.5 • C in summer, and water salinity varies from 22 to 35 PSU according to freshwater input variations during the year.…”

Section: Study Sitementioning

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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“…From a global model and data-base, it can be predicted that most of the Atlantic lagoons will have rather low atmospheric N-deposition because of oceanic effects due to prevailing Western winds while atmospheric N deposition is more important in the northern Mediterranean (Seitzinger et al, 2002). For the Bassin d'Arcachon, an averaged atmospheric deposition of 520 kg N km -2 year -1 has been reported (Rimmelin et al, 1998), which represents 5-9% of total N-loading. The susceptibility of coastal lagoons to eutrophication depends both on these external inputs as well as on the residence time of the water, which is influenced to a strong extent by tidal flushing and mixing.…”

Section: Physical Features Explaining Biodiversity In Coastal Lagoonsmentioning

confidence: 97%

“…1). The remaining 15% of the fresh water input is delivered by 17 other small tributaries (Rimmelin et al, 1998;De Wit et al, 2005), which all contribute to create local diversity of salinities and sediments at their outflows in the lagoon. The different hydrological zones in a lagoon are often characterized by different hydrological residence times.…”

Section: Physical Features Explaining Biodiversity In Coastal Lagoonsmentioning

confidence: 98%

Microbial diversity in the Bassin d’Arcachon coastal lagoon (SW France)

Wit¹

2008

Hydrobiologia

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The high biodiversity observed in coastal lagoons can often be related to a very high degree of environmental heterogeneity (b-biodiversity). In this article, I describe many physical factors that contribute to create environmental heterogeneity and different habitats within the Bassin d'Arcachon, a mesotidal lagoon in S.W. France. The microbial biodiversity has been studied in this coastal lagoon by culture-dependent and culture-independent techniques. The sediments of the meadows of the seagrass Zostera noltii have received a specific focus. During the last 15 years, several novel bacterial species have been isolated from these sediments and obtained in culture. Among these, five different species have been fully described as novel species according the Bacteriological Code and two of them represent also the type strain for a novel genus. The bacterial biodiversity has also been studied by molecular ecology techniques. An early study was focused on water column bacteria and a comparison has been made with the same community from the more eutrophic Prévost lagoon (France, Mediterranean coast). A clone library was also constructed for 16-S rRNA genes isolated and amplified from the 1-2 cm depth layer of the Z. noltii sediment. These studies showed a high degree of biodiversity and the importance of sulfate-reducing bacteria in the sediment, pointing to species that have not been obtained in culture. Collectively, these data show that there is still a large discrepancy between culture-dependent and culture-independent prokaryotic biodiversity. It is important to link the functional biogeochemical approach with the biodiversity approach. For the Bassin d'Arcachon studies, the biogeochemical approach has successfully nurtured the biodiversity studies, while the reverse has not yet been the case as the biogeochemical studies have lumped prokaryotes in functional groups.

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Study of Annual and Seasonal Dissolved Inorganic Nitrogen Inputs into the Arcachon Lagoon, Atlantic Coast (France)

Cited by 42 publications

References 0 publications

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

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

Microbial diversity in the Bassin d’Arcachon coastal lagoon (SW France)

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Study of Annual and Seasonal Dissolved Inorganic Nitrogen Inputs into the Arcachon Lagoon, Atlantic Coast (France)

Cited by 42 publications

References 0 publications

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

Modelling CO2 degassing from small acidic rivers using water pCO2, DIC and δ13C-DIC data

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

Microbial diversity in the Bassin d’Arcachon coastal lagoon (SW France)

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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