FN Archimer Export Format
PT J
TI Phosphorus dynamics and bioavailability in sediments of the Penze Estuary (NW France): in relation to annual P-fluxes and occurrences of Alexandrium Minutum
BT 
AF ANDRIEUX-LOYER, Francoise
   PHILIPPON, Xavier
   BALLY, Gabriel
   KEROUEL, Roger
   YOUENOU, Agnes
   LE GRAND, Jacqueline
AS 1:1;2:1;3:1;4:1;5:1;6:1;
FF 1:PDG-DOP-DCB-DYNECO-PELAGOS;2:PDG-DOP-DCB-DYNECO-PELAGOS;3:PDG-DOP-DCB-DYNECO-PELAGOS;4:PDG-DOP-DCB-DYNECO-PELAGOS;5:PDG-DOP-DCB-DYNECO-PELAGOS;6:PDG-DOP-DCB-DYNECO-PELAGOS;
C1 IFREMER, DYNECO Pelagos, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-DYNECO-PELAGOS
IN WOS Ifremer jusqu'en 2018
IF 2.961
TC 34
UR https://archimer.ifremer.fr/doc/2008/publication-4306.pdf
LA English
DT Article
DE ;Sequential extraction;Sediment phosphorus;Pore water;Phosphate fluxes;Estuary;Alexandrium minutum
AB The macrotidal estuary of Penze (Brittany, Western part of the Channel, France) has been subjected to recurrent annual toxic blooms of Alexandrium minutum since 1988. This study aims to specify the phosphorus dynamics and bioavailability in sediments in order to improve our understanding of Alexandrium occurrences. Sediment-P pools and diffusive phosphate fluxes were studied under similar hydrodynamic conditions, in the intermediate estuary in May, June and July 2003 and along the salinity gradient from August 2004 to June 2005. The results highlight a decrease in bioavailable phosphorus (iron and organic bound) from the inner part of the estuary seaward. The ratio of iron-bound phosphorus to iron-oxyhydroxides is lower in the inner and intermediate estuaries (5-8) than in the outer site (15), suggesting a saturation of sorption sites and greater phosphorus bioavailability in this area. Pools of bioavailable phosphorus in surficial sediments are about eight times higher than the annual net-export of P (7 ton year(-1)). Phosphate releases from sediments are always lower than 5 mu mol m(-2) d(-1) in March. The highest supplies occur in June and August in the intermediate area (up to 400 mu mol m(-2) d(-1)supercript stop) where they represent up to 50% of river loadings. These results further suggest that phosphate pulses coincide with occurrences of Alexandrium reported in June.
PY 2008
PD MAY
SO Biogeochemistry
SN 0168-2563
PU Springer
VL 88
IS 3
UT 000256470900002
BP 213
EP 231
DI 10.1007/s10533-008-9199-2
ID 4306
ER

EF