Spartina maritima (cordgrass) rhizosediment extracellular enzymatic activity and its role in organic matter decomposition processes and metal speciation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Duarte, B (Autor) Outra; Pedro Almeida (Autor) Outra; Cacador, I (Autor) Outra

Revista

Título: Marine Ecology

Vol. 30

Páginas: 65-73

ISSN: 0173-9565

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 26 Citações

Scopus - 34 Citações

Outras Informações

ID Authenticus: P-003-FH1

DOI: 10.1111/j.1439-0485.2009.00326.x

Abstract (EN): 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 organic-bound 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, beta-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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9