FN Archimer Export Format
PT J
TI Dietary plasticity in the bivalve Astarte moerchi revealed by a multimarker study in two Arctic fjords
BT 
AF DE CESARE, Silvia
   MEZIANE, Tarik
   CHAUVAUD, Laurent
   RICHARD, Joelle
   SEJR, Mikael K.
   THEBAULT, Julien
   WINKLER, Gesche
   OLIVIER, Frederic
AS 1:1;2:1;3:2;4:6,7;5:3,4;6:7;7:5;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Univ Antilles, Univ Caen Normandie,Unite Mixte Rech Biol Organis, Univ Pierre & Marie Curie,BOREA UMR 7208, Sorbonne Univ,Museum Natl Hist Nat,Inst Rech Dev, F-75005 Paris, France.
   Univ Bretagne Occidentale, Ctr Natl Rech Sci,Technopole Brest Iroise, Inst Rech Dev,Unite Mixte Rech, Inst Univ Europeen Mer,Lab Sci Environm Marin, F-29280 Plouzane, France.
   Aarhus Univ, Arctic Res Ctr, DK-8000 Aarhus C, Denmark.
   Aarhus Univ, Dept Biosci, Vejlsovej 25, DK-8600 Silkeborg, Denmark.
   UQAR, ISMER, Institut Sci Mer, Rimouski, PQ G5L 3A1, Canada.
   Florida Gulf Coast Univ, Coastal Watershed Inst, Ft Myers, FL 33965 USA.
   Univ Bretagne Occidentale, Ctr Natl Rech Sci,Technopole Brest Iroise, Inst Rech Dev,Unite Mixte Rech, Inst Univ Europeen Mer,Lab Sci Environm Marin, F-29280 Plouzane, France.
C2 MNHN, FRANCE
   CNRS, FRANCE
   UNIV AARHUS, DENMARK
   UNIV AARHUS, DENMARK
   UNIV QUEBEC (UQAR-ISMER), CANADA
   UNIV FLORIDA GULF COAST, USA
   UBO, FRANCE
UM LEMAR
IF 2.276
TC 12
UR https://archimer.ifremer.fr/doc/00616/72823/72330.pdf
   https://archimer.ifremer.fr/doc/00616/72823/72331.pdf
LA English
DT Article
DE ;Arctic benthos;Climate change;Pelagic-benthic coupling;Filter-feeding bivalves;Fatty acids;Trophic markers;Compound-specific carbon stable isotopes
AB Arctic coastal ecosystems are likely to be strongly affected by predicted environmental changes such as sea-ice decline and increase in freshwater input and turbidity. These changes are expected to impact primary production dynamics and consequently benthic consumers. The trophic relationship between primary producers and benthic primary consumers were compared in 2 Arctic fjords with different seasonal ice-cover: Young Sound (NE Greenland, a high-Arctic fjord) and Kongsfjorden (Svalbard Archipelago, a sub-Arctic fjord). For comparison, we selected the filter-feeding bivalve Astarte moerchi (belonging to the complex A. borealis), which has a broad geographical distribution in the Arctic. The bivalve digestive glands and food sources were characterized with fatty acids (FAs), bulk stable isotopes, and compound-specific stable isotopes of individual FAs. Our results suggest that diatoms of pelagic and/ or benthic origin are the main contributors to the A. moerchi diet in Young Sound and make up a less important fraction of the diet in the Kongsfjorden population. A contribution by sympagic diatoms is clearly excluded in the sub-Arctic fjord and needs to be further assessed in the Arctic fjord. The A. moerchi diet in sub-Arctic Kongsfjorden is more diversified, varies with season, and has contributions from dinoflagellates and macroalgal detritus. These results, together with higher concentrations of total FAs in the Young Sound population, demonstrated and characterized the trophic plasticity of this bivalve species. Based on these results, we discuss potential effects of environmental factors (shifts in trophic resources, increase in turbidity) for A. moerchi populations in changing Arctic ecosystems. 
PY 2017
PD MAR
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 567
UT 000397823100011
BP 157
EP 172
DI 10.3354/meps12035
ID 72823
ER

EF