FN Archimer Export Format
PT J
TI Spatio-temporal patterns in stable isotope composition of a benthic intertidal food web reveal limited influence from salt marsh vegetation and green tide
BT 
AF Sturbois, A.
   Riera, P.
   Desroy, Nicolas
   Brébant, Titouan
   Carpentier, A.
   Ponsero, A.
   Schaal, G.
AS 1:1,2,3,4;2:5;3:3;4:3;5:6;6:2,7;7:4;
FF 1:;2:;3:PDG-ODE-LITTORAL-LERBN;4:PDG-ODE-LITTORAL-LERBN;5:;6:;7:;
C1 Vivarmor Nature, 18 C rue du Sabot, 22440, Ploufragan, France
   Réserve naturelle nationale de la Baie de Saint-Brieuc, site de l’étoile, 22120, Hillion, France
   Ifremer, Laboratoire Environnement et Ressources Bretagne nord, 38 rue du Port Blanc, 35800, Dinard, France
   Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539 CNRS/UBO/IRD/IFREMER, BP 70, 29280, Plouzané, France
   Sorbonne Université, CNRS, Station Biologique de Roscoff, UMR7144, Place Georges Teissier, CS90074, 29688, Roscoff Cedex, France
   Université de Rennes 1, BOREA, Muséum National d'Histoire Naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles), Campus de Beaulieu, 35000, Rennes, France
   Saint-Brieuc Agglomération Baie d’Armor, 5 rue du 71ème RI, 22000, Saint-Brieuc, France
C2 VIVARMOR NATURE, FRANCE
   RESERVE NAT NATL BAIE ST BRIEUC, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV RENNES, FRANCE
   SAINT-BRIEUC AGGLO BAIE ARMOR, FRANCE
SI DINARD
SE PDG-ODE-LITTORAL-LERBN
UM LEMAR
IN WOS Ifremer UPR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 3.3
TC 5
UR https://archimer.ifremer.fr/doc/00750/86172/91415.pdf
LA English
DT Article
DE ;Marine food web;Benthic assemblages;Trophic connectivity;Benthic pelagic coupling;Stable isotope trajectory analysis
AB Assessing fluxes of matter and energy in food webs within and across benthic habitats is important to understand the ecological functioning in bays and estuaries, where the productivity is favoured by a wide diversity of primary producers. The temporal variability (March vs September 2019) in the carbon and nitrogen stable isotope composition of primary food sources and benthic invertebrates consumers was investigated in a large intertidal area (Western English-Channel, France). The study area is influenced by megatidal conditions and characterised by salt marshes in the sheltered part, and seasonal Ulva spp. blooms. The spatio-temporal variability in the structure of the benthic food web was analysed at the scales of both the whole bay and the different assemblages, which constitute the mosaic of habitats. Inferences on potential sources fuelling the food web were supported by spatio-temporal patterns based on covariations and stable isotope trajectory analysis. Results highlighted that phytoplankton, microphytobenthos and SOM were, most likely, the main food sources. The trophic connectivity between salt marsh and benthic habitats within the bay was limited to some macrofauna species inhabiting muddy creeks within the salt marsh. Unexpectedly, the influence of Ulva blooms appeared also limited. Spatial patterns illustrates the constancy of the spatial variability in the benthic pelagic coupling, with a higher influence of microphytobenthos in the upper shore compared to low shore assemblages. This first attempt to characterize intertidal benthic food web constitutes a relevant baseline for the conservation of the bay of Saint-Brieuc where a National nature reserve has been created in 1998 for the conservation of overwintering birds. The spatial and temporal patterns of the benthic food web observed in this study (1) confirm the importance to consider food web variability at spatial and temporal scales from sampling designs to data analysis, and (2) demonstrate the ability of the stable isotope trajectory analysis framework to highlight food web dynamics. 
PY 2022
PD MAR
SO Marine Environmental Research
SN 0141-1136
PU Elsevier BV
VL 175
UT 000780192400002
DI 10.1016/j.marenvres.2022.105572
ID 86172
ER

EF