FN Archimer Export Format
PT J
TI First steps of ecological restoration in Mediterranean lagoons: Shifts in phytoplankton communities
BT 
AF LERUSTE, A.
   MALET, Nathalie
   MUNARON, Dominique
   DEROLEZ, Valerie
   HATEY, E.
   COLLOS, Y.
   DE WIT, R.
   BEC, B.
AS 1:1;2:2;3:3;4:3;5:1;6:1;7:1;8:1;
FF 1:;2:PDG-ODE-LITTORAL-LERPAC;3:PDG-ODE-LITTORAL-LERLR;4:PDG-ODE-LITTORAL-LERLR;5:;6:;7:;8:;
C1 Univ Montpellier, CNRS, UMR MARBEC, IRD,Ifremer, Bat 24 CC 093,Pl Eugene Bataillon, F-34095 Montpellier 5, France.
   LEPAC Corse, Ifremer, F-20600 Im Agostini, Bastia, France.
   Univ Montpellier, UMR MARBEC, IRD, CNRS,LER LR,Ifremer, BP 171,Ave Jean Monnet, F-34203 Sete, France.
C2 UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
SI CORSE
   SETE
SE PDG-ODE-LITTORAL-LERPAC
   PDG-ODE-LITTORAL-LERLR
UM MARBEC
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.176
TC 44
UR https://archimer.ifremer.fr/doc/00346/45701/45324.pdf
LA English
DT Article
DE ;Phytoplankton;Coastal lagoons;Nutrient;Sewage effluents;Re-oligotrophication
AB Along the French Mediterranean coast, a complex of eight lagoons underwent intensive eutrophication over four decades, mainly related to nutrient over-enrichment from continuous sewage discharges. The lagoon complex displayed a wide trophic gradient from mesotrophy to hypertrophy and primary production was dominated by phytoplankton communities. In 2005, the implementation of an 11 km offshore outfall system diverted the treated sewage effluents leading to a drastic reduction of anthropogenic inputs of nitrogen and phosphorus into the lagoons. Time series data have been examined from 2000 to 2013 for physical, chemical and biological (phytoplankton) variables of the water column during the summer period. Since 2006, total nitrogen and phosphorus concentrations as well as chlorophyll biomass strongly decreased revealing an improvement in lagoon water quality. In summertime, the decline in phytoplankton biomass was accompanied by shifts in community structure and composition that could be explained by adopting a functional approach by considering the common functional traits of the main algal groups. These phytoplankton communities were dominated by functional groups of small-sized and fast-growing algae (diatoms, cryptophytes and green algae). The trajectories of summer phytoplankton communities displayed a complex response to changing nutrient loads over time. While diatoms were the major group in 2006 in all the lagoons, the summer phytoplankton composition in hypertrophic lagoons has shifted towards green algae, which are particularly well adapted to summertime conditions. All lagoons showed increasing proportion and occurrence of peridinin-rich dinophytes over time, probably related to their capacity for mixotrophy. The diversity patterns were marked by a strong variability in eutrophic and hypertrophic lagoons whereas phytoplankton community structure reached the highest diversity and stability in mesotrophic lagoons. We observe that during the re-oligotrophication process in coastal lagoons, phytoplankton shows complex trajectories with similarities with those observed in freshwater lake systems.
PY 2016
PD OCT
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Academic Press Ltd- Elsevier Science Ltd
VL 180
UT 000384866900019
BP 190
EP 203
DI 10.1016/j.ecss.2016.06.029
ID 45701
ER

EF