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Titolo:
Impact of mussel (Mytilus galloprovincialis) raft-culture on benthic macrofauna, in situ oxygen uptake, and nutrient fluxes in Saldanha Bay, South Africa
Autore:
Stenton-Dozey, J; Probyn, T; Busby, A;
Indirizzi:
Mariculture Marine & Coastal Management, ZA-8012 Rogge Bay, Cape Town, South Africa Mariculture Marine & Coastal Management Rogge Bay Cape Town South Africa ZA-8012
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
fascicolo: 5, volume: 58, anno: 2001,
pagine: 1021 - 1031
SICI:
0706-652X(200105)58:5<1021:IOM(GR>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEDIMENT-WATER INTERFACE; BENGUELA SYSTEM; SHELLFISH MARICULTURE; SULFATE REDUCTION; ORGANIC-MATTER; COMMUNITIES; CARBON; CYCLE; AQUACULTURE; SUCCESSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Stenton-Dozey, J Mariculture Marine & Coastal Management, 6th Floor Foretrust,Private Bag X2, ZA-8012 Rogge Bay, Cape Town, South Africa Mariculture Marine & Coastal Management 6th Floor Foretrust,Private Bag X2 Rogge Bay Cape Town South Africa ZA-8012
Citazione:
J. Stenton-Dozey et al., "Impact of mussel (Mytilus galloprovincialis) raft-culture on benthic macrofauna, in situ oxygen uptake, and nutrient fluxes in Saldanha Bay, South Africa", CAN J FISH, 58(5), 2001, pp. 1021-1031

Abstract

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 O-2 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 mu mol NH4.m(-2).h(-1)). Phosphate efflux (25-140mu mol.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 O-2 uptake rates, whereas at the reference sites, macrofauna appeared to be the major O-2 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 O-2 uptake rates or nutrient fluxes.

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Documento generato il 25/11/20 alle ore 00:08:40