FN Archimer Export Format
PT J
TI Modelling green macroalgal blooms on the coasts of Brittany, France to enhance water quality management
BT 
AF PERROT, Thierry
   ROSSI, Nadege
   MENESGUEN, Alain
   DUMAS, Franck
AS 1:1;2:1;3:2;4:2;
FF 1:;2:;3:PDG-ODE-DYNECO-BENTHOS;4:PDG-ODE-DYNECO-PHYSED;
C1 CEVA, F-22610 Pleubian, France.
   Inst Francais Rech Exploitat Mer IFREMER, F-20280 Pleubian, France.
C2 CEVA, FRANCE
   IFREMER, FRANCE
SI AUTRE
   BREST
SE CEVA
   PDG-ODE-DYNECO-BENTHOS
   PDG-ODE-DYNECO-PHYSED
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 2.508
TC 51
UR https://archimer.ifremer.fr/doc/00171/28268/26517.pdf
LA English
DT Article
DE ;2D model;Ulva;Eutrophication;Brittany coastal waters;Tracers;Nutrient reductions
AB First recorded in the 1970s, massive green macroalgal blooms have since become an annual recurrence in Brittany, France. Eutrophication (in particular to anthropogenic nitrogen input) has been identified as the main factor controlling Ulva ‘green tide’ events. In this study, we modelled Ulva proliferation using a two-dimensional model by coupling hydrodynamic and biological models (coined ‘MARS-Ulves’) for five sites along the Brittany coastline (La Fresnaye Bay, Saint-Brieuc Bay, Lannion Bay, Guissény Bay and Douarnenez Bay). Calibration of the biological model was mainly based on the seasonal variation of the maximum nitrogen uptake rate (VmaxN) and the half-saturation constant for nitrogen (KN) to reproduce the internal nutrient quotas measured in situ for each site. In each bay, model predictions were in agreement with observed algal coverage converted into biomass. A numerical tracking method was implemented to identify the contribution of the rivers that empty into the study bays, and scenarios of decreases in nitrate concentration in rivers were simulated. Results from numerical nitrogen tracking highlighted the main nitrogen sources of green tides and also showed that each river contributes locally to green tides. In addition, dynamic modelling showed that the nitrate concentrations in rivers must be limited to between 5 and 15 mg l- 1, depending on the bay, to reduce Ulva biomass by half on the coasts. The three-step methodology developed in this study (analysing total dissolved inorganic nitrogen flux from rivers, tracking nitrogen sources in Ulva and developing scenarios for reducing nitrogen) provides qualitative and quantitative guidelines for stakeholders to define specific nitrogen reduction targets for better environmental management of water quality.
PY 2014
PD APR
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier Science Bv
VL 132
UT 000334141400004
BP 38
EP 53
DI 10.1016/j.jmarsys.2013.12.010
ID 28268
ER

EF