FN Archimer Export Format
PT J
TI What is the menu today in a subantarctic kelp food web from the Kerguelen Islands? Phytodetritus, phytoplankton and phytobenthos; not living kelp
BT 
AF Le Bourg, Baptiste
   Saucède, Thomas
   Charpentier, Anouk
   Lepoint, Gilles
   MICHEL, Loïc
AS 1:1,2;2:3;3:1;4:1;5:1,4;
FF 1:;2:;3:;4:;5:PDG-REM-BEEP-LEP;
C1 Laboratory of Oceanology, Freshwater, and Oceanic Sciences Unit of reSearch (FOCUS), University of Liège, Allée du Six Août 13, 4000, Liège, Belgium
   Aix-Marseille Université and Université de Toulon, Mediterranean Institute of Oceanography (MIO), CNRS/INSU, IRD, UM 110, Campus universitaire de Luminy, case 901, 13288, Marseille, France
   Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, 6 boulevard Gabriel, 21000, Dijon, France
   Ifremer, Centre de Bretagne, REM/EEP, Laboratoire Environnement Profond, 29280, Plouzané, France
C2 UNIV LIEGE, BELGIUM
   UNIV AIX MARSEILLE, FRANCE
   UNIV BOURGOGNE, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-BEEP-LEP
UM BEEP-LM2E
IN WOS Ifremer UMR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.4
TC 2
UR https://archimer.ifremer.fr/doc/00791/90328/95849.pdf
   https://archimer.ifremer.fr/doc/00791/90328/95850.pdf
LA English
DT Article
DE ;Benthic communities;Food web;Kelp forests;Mixing models;Stable isotopes
AB Kelp forests dominated by Macrocystis pyrifera are widely distributed in coastal waters from boreal, temperate and subantarctic regions. This widespread distribution may result in regional differences in food web structure and functioning. In temperate northern regions, where most studies on kelp forest benthic food webs have been conducted, kelp grazing is a well-documented phenomenon and can lead to the overgrazing of M. pyrifera by sea urchins when their predators (e.g., sea otters) are absent. In contrast, little is known about their counterparts in subantarctic areas. The present study aimed to reconstruct the benthic food web of a kelp forest dominated by M. pyrifera in a subantarctic environment using stable isotope analysis. Stable carbon (δ13C), nitrogen (δ15N) and sulfur (δ34S) isotope ratios were measured from food sources (macrophytobenthos, suspended particulate organic matter SPOM, and sediment) and consumers (sponges, bivalves, gastropods, sedentary and mobile polychaetes, arthropods and echinoderms) which were sampled in a kelp forest of the Kerguelen archipelago. Mixing models highlighted two interconnected trophic pathways which were either supported by SPOM and resuspended macrophytobenthos detritus (bentho-pelagic), or by live micro/macrophytobenthos (phytobenthos-based). No major prey were highlighted for several consumers, indicating the existence of potential supplementary trophic pathways. No consumer relying primarily on living M. pyrifera was highlighted by the mixing models. The investigated kelp forest is hence a complex ecosystem supporting multiple trophic pathways, and direct consumption of M. pyrifera is limited. Nonetheless, M. pyrifera and other macrophytobenthos species may constitute a pool of detritus supporting several trophic pathways. 
PY 2022
PD SEP
SO Marine Biology
SN 0025-3162
PU Springer Science and Business Media LLC
VL 169
IS 9
UT 000850054300001
DI 10.1007/s00227-022-04105-z
ID 90328
ER

EF