FN Archimer Export Format
PT J
TI Reliance of deep-sea benthic macrofauna on ice-derived organic matter highlighted by multiple trophic markers during spring in Baffin Bay, Canadian Arctic
BT 
AF Yunda-Guarin, Gustavo
   Brown, Thomas A.
   Michel, Loic
   Saint-Béat, Blanche
   Amiraux, Rémi
   Nozais, Christian
   Archambault, Philippe
AS 1:1;2:2;3:3;4:1;5:1;6:4;7:1;
FF 1:;2:;3:PDG-REM-EEP-LEP;4:;5:;6:;7:;
C1 ArcticNet, Québec Océan, Takuvik, Université Laval, Québec, Canada
   The Scottish Association for Marine Science, Oban, Scotland, United Kingdom
   Centre de Bretagne, REM/EEP, Institut Français de Recherche pour l’Exploitation de la Mer (Ifremer), Laboratoire Environnement Profond, Plouzané, France
   Département de biologie, chimie et géographie, Université du Québec à Rimouski, Rimouski, Canada
C2 UNIV LAVAL, CANADA
   SAMS SCOTLAND, UK
   IFREMER, FRANCE
   UNIV QUEBEC (UQAR), CANADA
SI BREST
SE PDG-REM-EEP-LEP
IN WOS Ifremer UPR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
IF 6.053
TC 12
UR https://archimer.ifremer.fr/doc/00665/77749/79870.pdf
   https://archimer.ifremer.fr/doc/00665/77749/79871.docx
LA English
DT Article
DE ;Benthic food webs;Trophic markers;Sea-ice algae;Climate change;HBIs;Stable isotopes;Baffin Bay;Arctic Ocean
AB Benthic organisms depend primarily on seasonal pulses of organic matter from primary producers. In the Arctic, declines in sea ice due to warming climate could lead to changes in this food supply with as yet unknown effects on benthic trophic dynamics. Benthic consumer diets and food web structure were studied in a seasonally ice-covered region of Baffin Bay during spring 2016 at stations ranging in depth from 199 to 2,111 m. We used a novel combination of highly branched isoprenoid (HBI) lipid biomarkers and stable isotope ratios (δ13C, δ15N) to better understand the relationship between the availability of carbon sources in spring on the seafloor and their assimilation and transfer within the benthic food web. Organic carbon from sea ice (sympagic carbon [SC]) was an important food source for benthic consumers. The lipid biomarker analyses revealed a high relative contribution of SC in sediments (mean SC% ± standard deviation [SD] = 86% ± 16.0, n = 17) and in benthic consumer tissues (mean SC% ± SD = 78% ± 19.7, n = 159). We also detected an effect of sea-ice concentration on the relative contribution of SC in sediment and in benthic consumers. Cluster analysis separated the study region into three different zones according to the relative proportions of SC assimilated by benthic macrofauna. We observed variation of the benthic food web between zones, with increases in the width of the ecological niche in zones with less sea-ice concentration, indicating greater diversity of carbon sources assimilated by consumers. In zones with greater sea-ice concentration, the higher availability of SC increased the ecological role that primary consumers play in driving a stronger transfer of nutrients to higher trophic levels. Based on our results, SC is an important energy source for Arctic deep-sea benthos in Baffin Bay, such that changes in spring sea-ice phenology could alter benthic food-web structure. 
PY 2020
SO Elementa-science Of The Anthropocene
SN 2325-1026
PU University of California Press
VL 8
IS 1
UT 000615210600025
DI 10.1525/elementa.2020.047
ID 77749
ER

EF