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The summer influence of 1 and 2 yr old suspended mussel lines on benthic fluxes (oxy- gen, silicates, ammonium, phosphates, nitrates and nitrites) was studied in Grande-Entree lagoon (GEL), Iles-de-la-Madeleine, Quebec, Canada. This influence and its temporal variation were exam- ined in relation to bottom water, sediment and macrofauna characteristics. In situ mensurative exper- iments using benthic chambers and sediment cores were carried out at 2 mussel sites (M1 and M2) and 2 control sites (C1 and C2) in July, August and September 2003. In contrast to 1 yr old mussel lines (M1), 2 yr old lines (M2) enriched the sediment in organic matter and increased silicate, ammo- nium, phosphate and nitrite fluxes at the water-sediment interface. Silicate, ammonium and phos- phate fluxes were highest in August, when temperature was highest. The main nutrient releases observed at the water-sediment interface in M2 could reduce nitrogen and silica limitation in the water column. Mussel lines did not influence benthic macrofauna biomass, but favoured the recruit- ment of many small-sized organisms. No influence of mussel lines was observed on oxygen consump- tion at the water-sediment interface. Macrofauna biomass and oxygen consumption increased in parallel during the summer, but the respiration of the low biomass alone cannot explain the greater overall benthic oxygen demand. The latter was probably also driven by the oxidation of reduced compounds such as sulfides. The reduced nature of the sediment could be natural in GEL, but the continuous accumulation of mussel biodeposits since 1985 has probably contributed to the degrada- tion of the benthic environment in the mussel farm.

Summer influence of 1 and 2 yr old mussel cultures on benthic fluxes in Grande-Entrée lagoon, Îles-de-la-Madeleine (Québec, Canada)