FN Archimer Export Format
PT J
TI Role of pockmarks in diversity and species assemblages of coastal macrobenthic communities
BT 
AF DUBOIS, Stanislas
   DERIAN, Francois
   CAISEY, Xavier
   RIGOLET, Carinne
   CAPRAIS, Jean-Claude
   THIEBAUT, Eric
AS 1:1;2:1;3:1;4:1,2;5:3;6:2,4;
FF 1:PDG-ODE-DYNECO-BENTHOS;2:;3:PDG-ODE-DYNECO-BENTHOS;4:PDG-DOP-DCB-DYNECO-BENTHOS;5:PDG-REM-EEP-LEP;6:;
C1 IFREMER, Lab Ecol Benth Dynam Environm Cotier DYNECO, Technopole Brest Iroise, F-29280 Plouzane, France.
   Univ Paris 06, Univ Paris 04, Adaptat & Diversite Milieu Marin, UMR 7144,Stn Biol Roscoff, F-29680 Roscoff, France.
   IFREMER, Lab Ecol Benth Dynam Environm Cotier DYNECO, Dept Etud Ecosyst Profonds DEEP, F-29280 Plouzane, France.
   CNRS, UMR 7144, Adaptat & Diversite Milieu Marin, Stn Biol Roscoff, F-29680 Roscoff, France.
C2 IFREMER, FRANCE
   UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-ODE-DYNECO-BENTHOS
   PDG-DOP-DCB-DYNECO-BENTHOS
   PDG-REM-EEP-LEP
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.361
TC 6
UR https://archimer.ifremer.fr/doc/00272/38333/36576.pdf
LA English
DT Article
DE ;Benthic habitat;Biodiversity;Succession;Amphipod;Haploops;South Brittany;Sulfide;Methane;Environmental factors
AB We used existing bathymetric data to study the macrofauna of a geophysical pockmark field restricted to a benthic habitat engineered by the tubiculous amphipod Haploops nirae in South Brittany (France). Stations inside and outside pockmarks of different morphometric characteristics (location, size, depression depth) were sampled for macrofauna and environmental parameters (sediment characteristics, organic matter, chl a, hydrogen sulfide and methane concentrations). Diversity indices showed higher species richness inside pockmarks, especially for species with medium to high abundances. Most sediment cores showed low methane but high hydrogen sulfide concentrations. We hypothesised that after eruption, the remaining residual methane from pockmark sediments is oxidised by seawater sulfate and accounts for the high sulfide concentrations found at increasing depth in our samples and the low methane concentrations. We found no relationship between sediment profiles and morphometric features of the pockmarks. Macrofauna assemblages inside vs. outside pockmarks appeared to be different. Pockmarks appear to increase connectivity among habitats and heterogeneity within habitats, thereby creating local hotspots that allow the settlement of species that cannot otherwise develop in Haploops tube mats. Multivariate analyses distinguished 4 groups of pockmarks and control stations. We assumed that deeper pockmarks were created more recently than shallow pockmarks and that each pockmark is at a different stage of evolution, hence explaining the large variability in the characteristics of pockmark groups. This explains why previous investigations have found contradictory results when comparing macrofauna species diversity and composition between areas inside and outside pockmarks. Finally, we propose and discuss a successional stage model for pockmarks.
PY 2015
PD JUL
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 529
UT 000356076000007
BP 91
EP 105
DI 10.3354/meps11297
ID 38333
ER

EF