FN Archimer Export Format
PT J
TI Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France)
BT 
AF GUARINI, Jean-Marc
   BLANCHARD, Gerard
   BACHER, Cedric
   GROS, Philippe
   RIERA, Pascal
   RICHARD, Pierre
   GOULEAU, Dominique
   GALOIS, Robert
   PROU, Jean
   SAURIAU, Pierre-Guy
AS 1:1,2;2:1,2;3:1,2;4:3;5:1,2;6:1,2;7:1,2;8:1,2;9:1,2;10:1,2;
FF 1:;2:;3:PDG-DP2S;4:PDG-DP2S;5:PDG-DOP-DCN-AGSAE-CREMA;6:;7:;8:;9:PDG-DPCP;10:;
C2 CNRS, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
SI BREST
   LA ROCHELLE
   LA TREMBLADE
SE PDG-DP2S
   PDG-DOP-DCN-AGSAE-CREMA
   PDG-DPCP
TC 0
UR https://archimer.ifremer.fr/doc/1998/publication-3820.pdf
LA English
DT Article
DE ;Marennes Oleron;Intertidal mudflat;Geostatistics;Spatial distribution;Chrlorophyll a;Microphytobenthos
AB Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that seasonal dynamics of benthic microalgae biomass obeys a 'constant-density model' that describes the alternating spreading /shrinkage phenomenon around the few persistent patches of maximum biomass (ca 300 mg chl a m-2). Total biomass estimates were ca 13 t chl a (SE = 0.26) in June and 10 t chl a (SE = 0.28) in January. Calculating a raw approximation of the growth rate (0.1 d-l) of that biomass and considering that the total produced biomass is resuspended at flood tide, we found that microphytobenthos supplies about 2 µg chl a 1-', which corresponds to 30-90% of the chl a suspended in the water column, depending on the season. This suggests that microphytobenthos could be a major food source for secondary producers in both pelagic and benthic ecosystems of the Marennes-Oleron Bay. 
PY 1998
SO Marine Ecology Progress Series (depuis 2001)
PU Inter-Research
VL 166
BP 131
EP 141
ID 3820
ER

EF