Impact of mussel (Mytilus galloprovincialis) raft-culture on benthic macrofauna, in situ oxygen uptake, and nutrient fluxes in Saldanha Bay, South Africa

Canadian Journal of Fisheries and Aquatic Sciences - Tập 58 Số 5 - Trang 1021-1031 - 2001
Jeanie Stenton-Dozey, T. A. Probyn, Alistair Busby

Tóm tắt

Culture of the mussel Mytilus galloprovincialis in a South African bay created organic enrichment and anoxia in sediments. Particulate organic matter (POM) was high under rafts versus the references, especially in the first 10 cm (C = 7.5 versus 0.4%, N = 0.7 versus 0.08%). Total reducible sulphides (TRS) increased threefold downcore (from 0.04 to 0.12%). High C:N ratios (12–15) indicated accumulation of refractory POM, derived mainly from faeces and decaying mussels and foulers. Although O2 uptake by raft sediments was the lowest, rates could not conclusively be separated from the references. Ammonium dominated N efflux, the highest and most variable rates being under mussels (825 ± 500 µmol NH4·m–2·h–1). Phosphate efflux (25–140 µmol·m–2·h–1) could not be ascribed to culture biodeposition, but there was an inconclusive trend for the molar N:P ratio to be highest in these sediments. Macrofauna biomass was reduced and trophic groups and taxa altered. Under rafts, macrofauna and organic debris were linked to O2 uptake rates, whereas at the reference sites, macrofauna appeared to be the major O2 consumer. It was concluded that POM and TRS in sediment as well as macrofauna biomass, and potentially molar N:P ratios, were more sensitive indicators of benthic impact from mussel culture than O2 uptake rates or nutrient fluxes.

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Canadian Journal of Fisheries and Aquatic Sciences

Tập 58 Số 5

1021-1031

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