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Title: Spartina maritima (cordgrass) and its role in organic matter decomposition processes and metal.
Authors: Duarte, B.
Almeida, Pedro R.
Caçador, I,
Keywords: Extracellular enzymatic activity
metal speciation
salt marsh
Issue Date: 2009
Publisher: Blackwell Verlag
Citation: Duarte, B.; P.R. Almeida & I. Caçador (2009). Spartina maritima (cordgrass) and its role in organic matter decomposition processes and metal. Marine Ecology, 30 (Suppl. 1): 65-73.
Abstract: Seasonal monitoring was carried out to investigate the influence of extracellular enzymatic activity (EEA) on metal speciation and organic matter cycling in the rhizosediment of Spartina maritima. Heavy metal speciation was achieved by the Tessier scheme, and showed a similar pattern of variation of the organicbound fraction, indicating a decomposition process in progress. Both humic acid and organic matter showed the same seasonal pattern. The basal respiration of the rhizosediments also presented a similar seasonal pattern, indicating a microbial degradation of organic matter. The high organic-bound fraction found in the summer gradually decreased towards the winter. This decrease was found to be related to the increase of activity of peroxidase, b-N-acetylglucosaminidase and protease. Also the activity of sulphatase was found to be related to the depletion on the exchangeable fraction, probably due to sulphide formation and consequent mobilization. The results show an interaction between several microbial activities, affecting metal speciation.
Type: article
Appears in Collections:BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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