FN Archimer Export Format
PT J
TI Lack of detectable chemosynthesis at a sponge dominated subarctic methane seep
BT 
AF Sinner, Melina
   Li Hong, Wei
   MICHEL, Loïc
   Vadakkepuliyambatta, Sunil
   Knies, Jochen
   Sen, Arunima
AS 1:1,2,3;2:4;3:5;4:6;5:7,8;6:9,10;
FF 1:;2:;3:PDG-REM-BEEP-LEP;4:;5:;6:;
C1 National Oceanography Center, University of Southampton, Southampton, United Kingdom
   Plentzia Marine Station, University of the Basque Country, Plentzia, Spain
   Faculty of Sciences, University of Liège, Liège, Belgium
   Department of Geological Sciences, Stockholm University, Stockholm, Sweden
   Centre national de la recherche scientifique (CNRS), Ifremer, UMR6197 BEEP (Biologie et Ecologie des Ecosystèmes marins Profonds), University Brest, Plouzané, France
   National Centre for Polar and Ocean Research (NCPOR), Ministry of Earth Sciences, Government of India, Vasco-da-Gama, Goa, India
   Geological Survey of Norway, Trondheim, Norway
   iC3: The Centre for ice, Cryosphere, Carbon, and Climate, The Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway
   Department of Arctic Biology, The University Centre in Svalbard, Longyearbyen, Norway
   Department of Bioscience and Aquaculture, Nord University, Bodø, Norway
C2 NOC, UK
   UNIV PAIS VASCO EHU, SPAIN
   UNIV LIEGE, BELGIUM
   UNIV STOCKHOLM, SWEDEN
   IFREMER, FRANCE
   NCPOR, INDIA
   GEOL SURVEY NORWAY, NORWAY
   UNIV NORWAY, NORWAY
   UNIV SVALBARD, NORWAY
   UNIV NORD, NORWAY
SI BREST
SE PDG-REM-BEEP-LEP
UM BEEP-LM2E
IN WOS Ifremer UMR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 2.9
TC 0
UR https://archimer.ifremer.fr/doc/00847/95883/103770.pdf
LA English
DT Article
DE ;seepage;GIS;imagery;megafauna;chemosynthesis;marine litter;benthos;sulfide
AB We used high-resolution imagery within a Geographic Information System (GIS), free gas and porewater analyses and animal bulk stable isotope measurements to characterize the biotic and abiotic aspects of the newly discovered Vestbrona Carbonate Field (VCF) seep site on the Norwegian shelf (63°28′N, 6° 31′E, ∿270 m water depth). Free gas was mainly composed of microbial methane. Sediment porewater sulfide concentrations were in the millimolar range and thus high enough to sustain seep chemosymbiotrophic animals. Nonetheless, the VCF lacked chemosymbiotrophic animals despite an abundance of methane-derived carbonate crusts which are formed by the same anaerobic processes that sustain chemosymbiotrophic animals at seeps. Furthermore, none of the sampled taxa, across various trophic guilds exhibited a detectable contribution of chemosynthetically fixed carbon to their diets based on bulk stable isotope values, suggesting a predominantly photosynthetic source of carbon to the VCF seep food web. We link the absence of chemosymbiotrophic animals to highly localized methane flow pathways, which may act as a “shunt-bypass” of the anaerobic oxidation of methane (AOM) and by extension sulfide generation, thus leading to sediment sulfide concentrations that are highly heterogeneous over very short lateral distances, inhibiting the successful colonization of chemosymbiotrophic animals at the VCF seep. Instead, the seep hosted diverse biological communities, consisting of heterotrophic benthic fauna, including long lived taxa, such as soft corals (e.g., Paragorgia arborea) and stony corals (i.e., Desmophyllum pertusum, formerly known as Lophelia pertusa). Compared to the surrounding non-seep seafloor, we measured heightened megafaunal density at the seep, which we attribute to increased habitat heterogeneity and the presence of a variety of hard substrates (i.e., methane-derived authigenic carbonates, dropstones and coral rubble), particularly since the most abundant taxa all belonged to the phylum Porifera. Compared to the surrounding non-seep seafloor, marine litter was denser within the VCF seep, which we link to the more variable local topography due to authigenic carbonates, which can rip off parts of bottom trawling nets thereby making the seep act as catchment area for marine litter. 
PY 2023
PD JUN
SO Frontiers In Earth Science
SN 2296-6463
PU Frontiers Media SA
VL 11
UT 001042278600001
DI 10.3389/feart.2023.1203998
ID 95883
ER

EF