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| Billen, Gilles; Garnier, Josette; Ramarson, Antsiva; Romero, Estela; Thieu, Vincent; Le Noe, Julia; Silvestre, Marie; Thery, Sylvain; Barles, Sabine; Bognon, Sabine; Castaings, Jerome; Legendre, Romain; Riou, Philippe; Bacq, Nicolas; Fisson, Cédric. |
| Le système agro-alimentaire du bassin de la Seine est aujourd’hui caractérisé par une extrême spécialisation en grandes cultures céréalières de sa partie centrale, l’élevage étant repoussé vers sa frange orientale où domine la polyculture-élevage, et celle occidentale dont les systèmes se rapprochent du modèle d’élevage intensif du Grand Ouest. Cette spécialisation s’inscrit dans le mouvement historique de «modernisation» de l’agriculture qui s’affirme au milieu du XXe siècle, et est accentué en ce début de XXIe siècle par les politiques publiques et privées qui visent à renforcer la concentration de population le long de l’axe Paris-Le Havre («Le Grand Paris») au détriment des zones amont du bassin, et à accroitre la place de la France comme exportatrice... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00416/52796/53695.pdf |
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| Garnier, Josette; Le Gendre, Romain; Passy, Paul; Paris, Francois; Billen, Gilles; Callens, Julie; Cugier, Philippe; Tronquart, Olivier; Romero, Estela; Riou, Philippe. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00092/20336/17982.pdf |
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| Passy, Paul; Le Gendre, Romain; Garnier, Josette; Cugier, Philippe; Callens, Julie; Paris, Francois; Billen, Gilles; Riou, Philippe; Romero, Estela. |
| Eutrophication of the Seine estuary and the Bay of the Seine is a crucial environmental issue for the management of ecosystems and economic activities related to fisheries and tourism. A large quantity of nutrients, especially nitrogen, is brought to the coastal zone by the Seine River, the main input of that area, but also by smaller rivers along the Normandy coast. This large delivery of nitrogen leads to an imbalance between nitrogen (N), phosphorus (P) and silica (Si), which affects the growth of planktonic organisms and can exacerbate the occurrence of harmful algal blooms (HABs). These events can be damaging for shellfish fisheries, an important economic resource for the region. The study describes a new modelling chain coupling a riverine and a... |
| Tipo: Text |
Palavras-chave: Eutrophication; Harmful algal blooms; Nutrient load; Modelling; Water quality; Seine. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00300/41103/41542.pdf |
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| Romero, Estela; Garnier, Josette; Billen, Gilles; Ramarson, Antsiva; Riou, Philippe; Le Gendre, Romain. |
| 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... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00469/58067/60463.pdf |
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| Romero, Estela; Garnier, Josette; Lassaletta, Luis; Billen, Gilles; Le Gendre, Romain; Riou, Philippe; Cugier, Philippe. |
| We provide data on nutrient export for 28 rivers in southwestern Europe and analyze long-term changes in the context of anthropogenic pressures and regulation policies. Special attention is given to seasonal variations, because the integrated annual values that are usually provided do not allow us to establish comparisons with seasonal phytoplankton dynamics. The eutrophication risk associated with river inputs is addressed by means of an indicator (Index of Coastal Eutrophication Potential, ICEP, Billen and Garnier, Mar Chem 106:148–160, 2007). An overview of the temporal evolution and the intra-annual variability of the ICEP is discussed for specific rivers and integrated coastal regions. The annual dynamics of the eutrophication indicator is analyzed to... |
| Tipo: Text |
Palavras-chave: River inputs; Coastal zone; N:P:Si stoichiometry; Eutrophication; Seasonality; Europe. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00090/20152/17928.pdf |
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| Romero, Estela; Le Gendre, Romain; Garnier, Josette; Billen, Gilles; Fisson, Cedric; Silvestre, Marie; Riou, Philippe. |
| The Seine River is a highly artificialised catchment in Europe, comprising both productive agricultural areas and intense industrial and commercial activity. Due to its strategic importance, monitoring programs in the river started as early as the 1970s. The present study compiles and analyses this valuable data set (1970–2014), thoroughly describing the riverine section downstream of Paris and the estuary. We identify long-term trends and shifting patterns in nutrients and oxygen, and pay special attention to the river’s evolution after the year 2000, when the European Water Framework Directive came into force. The study has a manifest management perspective, and the results are discussed on the basis of the environmental quality standards proposed in... |
| Tipo: Text |
Palavras-chave: Seine River; Water quality; Nutrients; Long-term trends; WFD; Policy. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00311/42202/41541.pdf |
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