Reduced phosphorus loads from the Loire and Vilaine rivers were accompanied by increasing eutrophication in the Vilaine Bay (south Brittany, France). Ratmaya, W., Soudant, D., Salmon-Monviola, J., Plus, M., Cochennec-Laureau, N., Goubert, E., Andrieux-Loyer, F., Barillé, L., & Souchu, P. 16(6):1361–1380. Number: 6
Reduced phosphorus loads from the Loire and Vilaine rivers were accompanied by increasing eutrophication in the Vilaine Bay (south Brittany, France) [link]Paper  doi  abstract   bibtex   
\textlessp\textgreater\textlessstrong\textgreaterAbstract.\textless/strong\textgreater The evolution of eutrophication parameters (i.e., nutrients and phytoplankton biomass) during recent decades was examined in coastal waters of the Vilaine Bay (VB, France) in relation to changes in the Loire and Vilaine rivers. Dynamic linear models were used to study long-term trends and seasonality of dissolved inorganic nutrient and chlorophyll \textlessspan class="inline-formula"\textgreatera\textless/span\textgreater concentrations (Chl \textlessspan class="inline-formula"\textgreatera\textless/span\textgreater) in rivers and coastal waters. For the period 1997–2013, the reduction in dissolved riverine inorganic phosphorus (DIP) concentrations led to the decrease in their Chl \textlessspan class="inline-formula"\textgreatera\textless/span\textgreater levels. However, while dissolved inorganic nitrogen (DIN) concentrations decreased only slightly in the Vilaine, they increased in the Loire, specifically in summer. Simultaneously, phytoplankton in the VB underwent profound changes with increase in biomass and change in the timing of the annual peak from spring to summer. The increase in phytoplankton biomass in the VB, manifested particularly by increased summer diatom abundances, was due to enhanced summer DIN loads from the Loire, sustained by internal regeneration of DIP and dissolved silicate (DSi) from sediments. The long-term trajectories of this case study evidence that significant reduction of P inputs without simultaneous N abatement was not yet sufficient to control eutrophication all along the Loire–Vilaine–VB continuum. Upstream rivers reveal indices of recoveries following the significant diminution of P, while eutrophication continues to increase downstream, especially when N is the limiting factor. More N input reduction, paying particular attention to diffuse N sources, is required to control eutrophication in receiving VB coastal waters. Internal benthic DIP and DSi recycling appears to have contributed to the worsening of summer VB water quality, augmenting the effects of anthropogenic DIN inputs. For this coastal ecosystem, nutrient management strategies should consider the role played by internal nutrient loads to tackle eutrophication processes.\textless/p\textgreater
@article{ratmaya_reduced_2019,
	title = {Reduced phosphorus loads from the Loire and Vilaine rivers were accompanied by increasing eutrophication in the Vilaine Bay (south Brittany, France)},
	volume = {16},
	issn = {1726-4170},
	url = {https://www.biogeosciences.net/16/1361/2019/},
	doi = {10.5194/bg-16-1361-2019},
	abstract = {{\textless}p{\textgreater}{\textless}strong{\textgreater}Abstract.{\textless}/strong{\textgreater} The evolution of eutrophication parameters (i.e., nutrients and phytoplankton biomass) during recent decades was examined in coastal waters of the Vilaine Bay ({VB}, France) in relation to changes in the Loire and Vilaine rivers. Dynamic linear models were used to study long-term trends and seasonality of dissolved inorganic nutrient and chlorophyll {\textless}span class="inline-formula"{\textgreater}\textit{a}{\textless}/span{\textgreater} concentrations (Chl {\textless}span class="inline-formula"{\textgreater}\textit{a}{\textless}/span{\textgreater}) in rivers and coastal waters. For the period 1997–2013, the reduction in dissolved riverine inorganic phosphorus ({DIP}) concentrations led to the decrease in their Chl {\textless}span class="inline-formula"{\textgreater}\textit{a}{\textless}/span{\textgreater} levels. However, while dissolved inorganic nitrogen ({DIN}) concentrations decreased only slightly in the Vilaine, they increased in the Loire, specifically in summer. Simultaneously, phytoplankton in the {VB} underwent profound changes with increase in biomass and change in the timing of the annual peak from spring to summer. The increase in phytoplankton biomass in the {VB}, manifested particularly by increased summer diatom abundances, was due to enhanced summer {DIN} loads from the Loire, sustained by internal regeneration of {DIP} and dissolved silicate ({DSi}) from sediments. The long-term trajectories of this case study evidence that significant reduction of P inputs without simultaneous N abatement was not yet sufficient to control eutrophication all along the Loire–Vilaine–{VB} continuum. Upstream rivers reveal indices of recoveries following the significant diminution of P, while eutrophication continues to increase downstream, especially when N is the limiting factor. More N input reduction, paying particular attention to diffuse N sources, is required to control eutrophication in receiving {VB} coastal waters. Internal benthic {DIP} and {DSi} recycling appears to have contributed to the worsening of summer {VB} water quality, augmenting the effects of anthropogenic {DIN} inputs. For this coastal ecosystem, nutrient management strategies should consider the role played by internal nutrient loads to tackle eutrophication processes.{\textless}/p{\textgreater}},
	pages = {1361--1380},
	number = {6},
	journaltitle = {Biogeosciences},
	author = {Ratmaya, Widya and Soudant, Dominique and Salmon-Monviola, Jordy and Plus, Martin and Cochennec-Laureau, Nathalie and Goubert, Evelyne and Andrieux-Loyer, Françoise and Barillé, Laurent and Souchu, Philippe},
	urldate = {2020-01-06},
	date = {2019-04-02},
	note = {Number: 6}
}
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