FN Archimer Export Format
PT J
TI Dynamics of particulate organic matter delta N-15 and delta C-13 during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France)
BT 
AF SAVOYE, N
   AMINOT, Alain
   TREGUER, Paul
   FONTUGNE, M
   NAULET, N
   KEROUEL, Roger
AS 1:;2:;3:;4:;5:;6:;
FF 1:;2:PDG-DEL-EC-EB;3:;4:;5:;6:PDG-DEL-EC-EB;
C1 Inst Francais Rech Exploitat Mer, Dept Ecol Cotiere, F-29280 Plouzane, France.
   CEA, Lab Sci Climat & Environm, CNRS, UMR 1572, F-91198 Gif Sur Yvette, France.
   Univ Nantes, CNRS, UMR 6006, Lab Analyse Isotop & Electrochim Metab, F-44322 Nantes, France.
   Ins Univ Europeen Mer, CNRS, UMR 6539, Lab Sci Environm Marin, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
   CEA, FRANCE
   UNIV NANTES, FRANCE
   INS UNIV EUROPEEN MER, FRANCE
SI BREST
SE PDG-DEL-EC-EB
   PDG-DRO-GM
IN WOS Ifremer jusqu'en 2018
   copubli-univ-france
IF 2.135
TC 101
UR https://archimer.ifremer.fr/doc/00000/10645/7593.pdf
LA English
DT Article
DE ;C and N stable isotopes;phytoplankton;coastal ecosystem;nitrate utilization;Bay of Seine
AB Two cruises (April and June 1997) were carried out in the Bay of Seine, a nitrate- and ammonium-enriched ecosystem of Western Europe, to identify the major mechanisms that control delta(15)N and VC in spring particulate organic matter (POM). Particulate organic nitrogen (PON) delta(15)N ranged between 0.8 and 5.2parts per thousand in April and between 2.2 and 6.2parts per thousand in June, while particulate organic carbon (POC) delta(13)C ranged between -24.3 and -19.7parts per thousand, and between -20.0 and -16.2parts per thousand during the same periods. During spring 1997, POM was highly dominated by autochthonous phytoplankton. It is shown that the variation of PON delta(15)N is due to both nitrate mixing between river and marine waters and fractionation of N stable isotopes during nitrate utilization by phytoplankton. Therefore, similarly to what was previously shown for open ocean, delta(15)N can be used as a proxy of spring fractional nitrate utilization in coastal ecosystems. It is also shown that POC delta(13)C in spring is controlled by POC concentration and C:N ratio (in addition to 'temperature effects'), which are considered here as indicators of primary production and phytoplankton degradation, respectively. The co-variation of delta(13)C and delta(15)N describes the spring phytoplankton dynamics: at the start of phytoplankton development, nitrate concentration is high (low delta(15)N) and phytoplankton production is low (low delta(13)C); then primary production increases (delta(13)C becomes higher) and the nitrate pool diminishes (deltadelta(15)N becomes higher); at a later stage, the nitrate pool is depleted (high delta(15)N), part of the phytoplankton becomes degraded and production is still high (high delta(13)C).
PY 2003
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 255
UT 000184268600003
BP 27
EP 41
ID 10645
ER

EF