Sediment Community Oxygen Consumption along a Shelf-slope Transect in the Western Gulf of Lions
SCOC measurements were carried out on a seasonal basis during 1997 and 1998 along a transect from the shelf to the slope of the western Gulf of Lions (northwestern Mediterranean). Values ranged from 0.6 to 48.0 mmol O2 m−2 d−1 and decreased with increasing depth. The overall mean was 11.2 ± 1.0 mmol O2 m−2 d−1 for the shelf and 23 ± 1.9 mmol O2 m−2 d−1 for the slope, with a significant difference between canyon axis (average 37 ± 2.1 mmol O2 m−2 d−1) and open slope sites (average 1.2 ± 0.8 mmol O2 m−2 d−1).The highest values were registered in all stations in late spring, when they were 1.5 to 4.2 times higher than in other seasons, except for the shelf deepest station, which showed a slight temporal variation. Temporal and spatial variations appeared to be related to the benthic biological activity and organic matter input Our data confirm previous findings from other authors in the Gulf of Lions and highlight the importance of organic matter mineralization in this area in the frame of the processes occurring at the sediment-water interface.
KeywordsContinental Margin Particulate Organic Carbon Sedimentary Organic Matter Organic Matter Input Global Biogeochem Cycle
Unable to display preview. Download preview PDF.
- Blackburn TH (1991) Accumulation and regeneration: processes at the benthic boundary layer. In: Mantoura RFC, Martin JM, Wollast R (eds) Ocean margin processes in global change. John Wiley and Sons, New York, pp 181–195Google Scholar
- de Bovée F, Picon P, Medernach L et al (1998) In situ studies of biogeochemical processes occuring at the deep-sea floor: first results obtained with the Banyuls Benthic Lander. Eur Geophys Soc, Katlenburg-Lindau, Germany. Annades Gephys 16: C731 (Suppl II)Google Scholar
- Deming JW, Baross JA (1993) The early diagenesis of organic matter: bacterial activity. In: Engel MH, Macko SA (eds) Organic geochemistry, principles and applications. Plenum Press, New York, pp 119–144Google Scholar
- Helder W (1989) Early diagenesis and sediment-water exchange in the Golfe du Lion. In: Martin JM, Bardi H (eds) EROS 2000 (European River Ocean System) project. Water Pollut Res Rep, CEC Directorate-Gen Sci Res Dev, Brussels 13, pp 87–101Google Scholar
- Heussner S, Calafat AM, Palanques A (1996) Quantitative and qualitative features of particle fluxes in the North-Balearic basin. In: Canals M, Casamor JL, Cacho I, Calafat AM, Monaco A (eds) EUROMARGE-NB Final Rep. MAST II Progr, vol II, pp 41–66Google Scholar
- Mantoura RFC, Martin J-M, Wollast R (edi) (1991) Ocean margin processes in global change. John Wiley and Sons, New YorkGoogle Scholar
- Tholosan O (1999) Activités microbiennes dans les eaux et les sédiments profonds: rôle de la pression hydrostatique. Thèse Doctorat, Univ Méditerranée, Aix-Marseille 2Google Scholar
- Wollast R (1991) The coastal organic carbon cycle: fluxes, sources, and sinks. In: Mantoura RFC, Martin J-M, Wollast R (eds) Ocean margin processes in global change. John Wiley and Sons, New York pp 365–381Google Scholar