Inter-Research |
IR Home
AME Home Editors Forthcoming Information Subscribe Journals Home MEPS AME CR DAO ESEP Search Subscribe Book Series EE Books Top Books ESEP Books Order EEIU Brochures (pdf format) Discussion Forums Home Research Endangered Species Programs Institutions International Ecology Institute Eco-Ethics International Union Foundation Otto Kinne Foundation |
Effect of naturally occurring bromophenols on sulfate reduction and ammonia oxidation in intertidal sedimentsGiray C, King GMABSTRACT: We examined the effect on ammonium oxidation and sulfate reduction of several brominated compounds [4-bromophenol, 2,4-dibromophenol (2,4-DBP), 2,6-dibromophenol and 2,4,6-tribromophenol] that occur naturally in enteropneusts. We compared rates of these processes with and without bromoorganics using bulk intertidal sediments and burrow wall sediments from 3 enteropneust species (2 containing 2,4-DBP and 1 containing 2,3,4-tribromopyrrole), a mollusc (Mya arenaria)and a polychaete (Nereis virens). Sulfate reduction in bulk sediment was unaffected by bromophenols at concentrations <100 nmol cm-3 sediment, but was inhibited temporarily at 1 µmol cm-3. Sulfate reduction in burrow wall sediments differed from bulk sediments, but was not correlated with concentrations of naturally occurring bromophenols. Ammonium oxidation was inhibited in surface sediments by bromophenol concentrations as low as 1 nmol cm-3 sediment. Ammonium oxidation was enhanced in burrow wall sediments of N. virens, M. arenaria and the enteropneust Saccoglossus bromophenolosus relative to surface sediments, but was markedly lower and negatively correlated with ambient 2,4-DBP in burrow wall sediments of a second enteropneust, Protoglossus graveolens.
KEY WORDS: Marine biogeochemistry · Enteropneusts · Bromophenols · Sulfate reduction · Ammonium oxidation · Microbial inhibition
Published in AME Vol.
13, No. 3
(1997) on September 11
|
Copyright © 2003; Inter-Research
Webmaster: webmaster@int-res.com |