We examined the effects of hypoxia and sulphide levels on the ventilatory activity of Arenicola marina and determined whether ventilation compensates for oxygen deficiency and affects the mode of energy provision. A. marina ventilated intermittently, irrespective of ambient P(O2) and sulphide concentration. The ventilation rate was 28.5+/-16 ml h(-1) g(-1) wet mass during normoxia, but increase...

The product of the biological sulphate reduction is sulphide. High concentrations of molecular H2S (g) can be inhibitory for microbial activity, especially at a reactor pH of 6 to 7. This paper focuses on the effect of high sulphide concentrations on the sulphate reduction rates. The results of three investigations operating a continuous reactor, a column reactor and batchtest reactors have sho...

It has been inferred that the marine distributions of micronutrient cadmium (Cd) and its stable isotope composition (expressed as ? 114 Cd) bear widespread unambiguous evidence for loss Cd from shallow water column through formation particle-associated sulphide (CdS) in oxygen minimum zones (OMZs). In this review, we bring together elemental isotopic datasets dissolved particulate pools order t...