FN Archimer Export Format
PT J
TI Effect of local hydroclimate on phytoplankton groups in the Charente estuary
BT 
AF GUESDON, Stephane
   STACHOWSKI-HABERKORN, Sabine
   LAMBERT, Christophe
   BEKER, Beatriz
   BRACH-PAPA, Christophe
   AUGER, Dominique
   BECHEMIN, Christian
AS 1:1;2:2;3:3;4:3;5:4;6:4;7:5;
FF 1:PDG-ODE-LITTORAL-LERPC;2:PDG-RBE-BE-LBEX;3:;4:;5:PDG-ODE-LITTORAL-LERPAC;6:PDG-RBE-BE-LBCM;7:PDG-RBE-SG2M-LGPMM;
C1 IFREMER, Lab Environm Ressource Pertuis Charentais, Ave Mus de Loup, F-17390 La Remblade, France.
   IFREMER, Lab Ecotoxicol, Rue Ile Yeu,BP 21105, F-44311 Nantes 03, France.
   UBO, Lab Sci Environm Marin LEMAR, IUEM UMR6539, Pl Nicolas Copernic, F-29280 Plouzane, France.
   IFREMER, Lab Biogeochim Contaminants Metall, Rue Ile Yeu,BP 21105, F-44311 Nantes 03, France.
   IFREMER, Lab Environm Ressource Pertuis Charentais, BP7, F-17137 Lhoumeau, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
SI LA TREMBLADE
   NANTES
   TOULON
SE PDG-ODE-LITTORAL-LERPC
   PDG-RBE-BE-LBEX
   PDG-ODE-LITTORAL-LERPAC
   PDG-RBE-BE-LBCM
   PDG-RBE-SG2M-LGPMM
UM LEMAR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.176
TC 6
UR https://archimer.ifremer.fr/doc/00349/46005/45674.pdf
LA English
DT Article
DE ;Hydroclimate;Estuary;Phytoplankton;Size composition;Nutrients;Trace metals
AB This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and Photosynthetically Active Radiation (PAR)) on phytoplankton abundances. Two partial triadic analyses (PTA) were run in order to visualize seasonal variations of i) phytoplankton groups and ii) nutrients and trace elements, irrespective of spatial gradient: picoeukaryote occurrence showed a difference between year 2011 and the years 2012 and 2013 (as did cadmium, nickel and silica levels). However, both PTA revealed greater differences between year 2013 and the years 2011 and 2012, as shown by occurrences of cryptophytes, dinoflagellates and nanoeukaryotes, as well as copper and phosphate levels. These results showed a shift between the hydroclimate breakpoint and some phytoplankton responses, suggesting that their development and succession might depend on conditions early in the year. Finally, a STATICO analysis was performed on the paired PTA in order to examine the relations of phytoplankton with nutrients and metals more closely. Most phytoplankton groups were represented on the first axis, together with cadmium on the one hand, and nitrates, silica and nickel on the other. This analysis revealed the separation of phytoplankton groups on the second axis that represented phosphates and copper. Hydroclimatic conditions and the nature of freshwater inputs, especially phosphates and copper content, might be key factors driving phytoplankton structure in the Charente estuary.
PY 2016
PD NOV
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Academic Press Ltd- Elsevier Science Ltd
VL 181
UT 000386406500033
BP 325
EP 337
DI 10.1016/j.ecss.2016.08.035
ID 46005
ER

EF