FN Archimer Export Format
PT J
TI Impacts of an Eruption on Cold-Seep Microbial and Faunal Dynamics at a Mud Volcano
BT 
AF GIRARD, Fanny
   SARRAZIN, Jozee
   OLU, Karine
AS 1:1;2:1;3:1;
FF 1:PDG-REM-EEP-LEP;2:PDG-REM-EEP-LEP;3:PDG-REM-EEP-LEP;
C1 Ifremer, EEP, F-29280, Plouzané, France
C2 IFREMER, FRANCE
SI BREST
SE PDG-REM-EEP-LEP
IN WOS Ifremer UPR
   DOAJ
IF 5.247
TC 10
UR https://archimer.ifremer.fr/doc/00624/73631/73069.pdf
   https://archimer.ifremer.fr/doc/00624/73631/73070.pdf
   https://archimer.ifremer.fr/doc/00624/73631/73076.mp4
   https://archimer.ifremer.fr/doc/00624/73631/73077.mp4
   https://archimer.ifremer.fr/doc/00624/73631/73078.mp4
LA English
DT Article
DE ;Hakon Mosby Mud Volcano;LOOME;Arctic;Beggiatoa;deep-sea observatories;time series;megafauna
AB Cold seeps are widespread in the deep sea and, like other chemosynthesis-based ecosystems, often host high faunal biomass. Temporal changes at seeps have been inferred by comparing communities at different successional stages; nonetheless, temporal studies in seep ecosystems are rare. Using data collected as part of a benthic observatory, we characterized intra-annual microbial and faunal dynamics in a microbial mat habitat on the Håkon Mosby mud volcano (1256 m depth; Barents Sea), and evaluated the effects of a mud eruption on the biota. Video sequences recorded twice daily for 4.5 months with an autonomous imaging module were analyzed to quantify changes in microbial mat cover and megafaunal density and behavior. In addition, time series data for pressure, bottom currents, and seabed temperature were analyzed to characterize environmental changes. Of the five taxa observed on the video footage, the zoarcid Lycodes squamiventer, the pycnogonid Nymphon macronyx, and the skate Amblyraja hyperborea were the most common. Zoarcids made frequent incursions on microbial mats, but were more often documented on the adjacent sediments. The cyclic behavior of common trends identified between microbial mat cover, zoarcid densities, and abiotic variables using dynamic factor analysis suggested that seep ecosystem dynamics at the Håkon Mosby mud volcano may be modulated by tides and the activity of the volcano. Moreover, the eruption that occurred about 2 months after the start of the study had a significant impact on faunal densities, microbial activity, and environmental variables. The eruption was preceded by a steady increase in seabed temperatures, density of small holes (indicative of gas emissions), and microbial mat cover. It was followed by 3- and 5-fold increase in zoarcid and pycnogonid densities, respectively. To our knowledge, this study is the first to analyze intra-annual temporal data in a cold-seep ecosystem and to present data on the effects of a mud eruption on seep microbial and faunal dynamics. Overall, our results provide the first insight into ecosystem dynamics at a high-latitude cold seep and highlight the need to collect high-resolution temporal data to evaluate seep communities’ response to a warming Arctic and their potential role in mitigating methane emissions. 
PY 2020
PD APR
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media Sa
VL 7
IS 241
UT 000526864600001
DI 10.3389/fmars.2020.00241
ID 73631
ER

EF