The buffering capacity of a small estuary on nutrient fluxes originating from its catchment (Leyre estuary, SW France)

Canton, Mathieu; Anschutz, Pierre; Poirier, Dominique; Chassagne, Romain; Deborde, Jonathan; Savoye, Nicolas

doi:10.1016/j.ecss.2011.12.030

Cited by 11 publications

(6 citation statements)

References 55 publications

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“…Similar assessments have been done for estuaries in the Atlantic coast of Europe (Soetaert et al ; Canton et al ) and elsewhere (e.g., Nixon et al ; Jickells et al ; Sin et al ; Xu et al ) that can be compared to our retention estimates.…”

Section: Discussionsupporting

confidence: 68%

“…These authors emphasized the significance of sorptive removal for elements having a strong particle affinity, particularly in those estuaries with a well‐developed turbidity maximum zone (TMZ). Likewise, Canton et al () reported very quick transformation and consumption processes in the short transit time between the Leyre River mouth and the waters of Arcachon Bay during productive periods. In the Seine, Garnier et al () estimated that the lower estuary is able to retain about 7% of the annual N inputs, 4% of dissolved silica inputs, and over 30% of inorganic P inputs.…”

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confidence: 90%

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Modeling the biogeochemical functioning of the Seine estuary and its coastal zone: Export, retention, and transformations

Romero

Garnier

Billen

et al. 2018

Limnology & Oceanography

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The model ECO-MARS3D, successfully applied thus far to coastal ecosystems, has been extended to encompass the Seine estuary up to Poses, at the limit between the river and the estuary. We used updated bathymetric data and thoroughly calibrated the hydrodynamics and the sedimentary dynamics in the turbidity maximum zone (TMZ). Biogeochemical processes related to oxygen were newly implemented, and freshwater phytoplankton and zooplankton groups were added to the existing marine groups. The simulations allowed us to evaluate the filter effect of the estuary with regard to the main nutrients (N, P, and Si). Today, this filter role appears quite limited and variable depending on the hydrology. On average, considering three different hydrological years, the estuary was able to retain (at least temporarily) 19 kt N yr −1 , 10 kt Si yr −1 , and 0.7 kt P yr −1 , amounting to −13%, −11%, and −27% of the total N, Si, and P inputs, respectively. Seasonal differences in the filtering capacity (lower in winter than in summer) were similar between wet and dry years. Nutrient retention was higher in the upstream fluvial estuary than in the TMZ, the former being mostly characterized by uptake, the latter by remineralization. At the coastal zone, the dry year showed greater risk of eutrophication. Despite lower discharge and lower nutrient fluxes, inputs were confined into a shallower layer, close to the coastline, where nutrients were concentrated and allowed phytoplankton to thrive. Differences in the N : P : Si ratios (lower P-deficit during dry years) could also underpin the larger proliferations, and notably the larger dinoflagellate blooms during dry years.

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Section: Discussionsupporting

confidence: 68%

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confidence: 90%

Modeling the biogeochemical functioning of the Seine estuary and its coastal zone: Export, retention, and transformations

Romero

Garnier

Billen

et al. 2018

Limnology & Oceanography

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“…Furthermore, the average particulate C/N (6.6±1.0) or C/P ratio (92±16) for surface waters (Table 2) was somewhat close to the Redfield ratio (C/N=6.6, C/P=106), and evidently lower than other estuarine systems, such as the Mackenzie River Shelf (Ruttenberg and Goñi, 1997), Bay of St. Louis (Cai et al, 2012) and Leyre Estuary (Canton et al, 2012). Since P-containing…”

Section: Accepted Manuscriptmentioning

confidence: 86%

“…Results of our field study in the Jiulong River estuary clearly showed a strong riverine DIP source, a general removal of DIP during early estuarine mixing, and conservative mixing behavior after early estuarine mixing (Figs. 2 and 6), similar to estuaries with anthropogenic influences, such as the Humber and Tanshui river estuaries and the Mississippi River plume (e.g., Prastka and Malcolm, 1994;Fang, 2000, Shim et al, 2012, but distinctly different from more pristine estuaries, such as the Bay of St. Louis and Leyre estuary (e.g., Canton et al, 2012;Lin et al, 2012a). Even though the slight addition or release of DIP from labile and exchangeable particulate P species occurred during early estuarine mixing (see Section 4.2), the extent of DIP addition or the buffering of DIP concentrations by suspended particulate matter (i.e., "P-buffering" mechanism) was evidently reduced and became insignificant in most areas of the estuary, compared with the observation in more pristine estuaries (e.g., Lin et al, 2012a) and the Jiulong River estuary before the recent economic development over the past 20 years (e.g., Yang et al, 1998;Zhang et al, 1999;Yan et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 96%

Distribution, partitioning and mixing behavior of phosphorus species in the Jiulong River estuary

et al. 2013

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“…All or part of the extraction schemes described above have been used by our research group (e.g., Anschutz et al 1999Anschutz et al , 2007Deborde et al 2007Deborde et al , 2008Canton et al 2012). These papers provide illustrations of the procedures when applied to riverine, estuarine, and marine suspended particulates and sediments.…”

Section: Assessment and Discussionmentioning

confidence: 99%

Spectrophotometric determination of phosphate in matrices from sequential leaching of sediments

Anschutz

Deborde

2016

Limnology & Ocean Methods

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The speciation of Phosphorus (P) in geologic materials can inform diverse investigations in such as aquatic biogeochemistry, soil sciences, and paleo-oceanography. Here, we describe in detail a set of sequential extraction schemes to measure P concentrations from several operationally defined phases: pore water, exchangeable or loosely sorbed P, Fe-bound P, P associated with biogenic apatite, P associated with authigenic apatite and carbonate forms, P associated with detrital apatite and inorganic forms, and organic P. The two benefits of the procedures we describe compared to prior methodological studies are: (1) fast, simple and inexpensive colorimetric methods have been developed for P determination in all the different matrices; and (2) the Febound phosphorus pool is separated into two fractions, allowing the P associated with most reactive Fefraction to be distinguished from P bound to the remainder of the Fe-oxides. Adaptations of these procedures to optimize the characterization of P pools in a range of material types are also outlined.

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The buffering capacity of a small estuary on nutrient fluxes originating from its catchment (Leyre estuary, SW France)

Cited by 11 publications

References 55 publications

Modeling the biogeochemical functioning of the Seine estuary and its coastal zone: Export, retention, and transformations

Modeling the biogeochemical functioning of the Seine estuary and its coastal zone: Export, retention, and transformations

Distribution, partitioning and mixing behavior of phosphorus species in the Jiulong River estuary

Spectrophotometric determination of phosphate in matrices from sequential leaching of sediments

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