Data/hora: 02/06/2024 17:14:54

Provedor de dados: | 5
País: | France
Título: | Polychaete tube walls as zonated microhabitats for marine bacteria.
Autores: | Reichardt, W.
Data: | 1984-10
Ano: | 1984
Palavras-chave: | Nereis diversicolor; Polychaeta; Bacteria; Microorganisms; Carbon cycle; Tube dwellers; Carbon fixation; Burrows; Bioturbation; Sediments.
Resumo: | The predominantly anoxic, sulfide-rich sandy sediment of a shallow lagoon at Kiel Fjord was densely inhabited by the polychaete worm Nereis diversicolor (280 cm super(3) m super(-2) of biomass volume). Burrow walls which contrasted by their brown coloration of at least 1.5 mm thickness with the bulk of the reduced black sediment, made up for 6% of the total volume of the 10 cm cores investigated. Only the uppermost mm of the internal surface layer contained detectable O sub(2). As a result of the build up of internal redox gradients, CO sub(2) dark fixation was activated in the burrow walls (by a factor of approximately equals 2). Assays of ribulose-biphosphate carboxylase activities and viable counts of potentially chemoautotrophic bacteria in different parts of the lagoon sediment suggested that burrow walls as the sites of maximal CO sub(2) fixation rates would not qualify as microbial barriers. This view of polychaete burrow walls as open enrichment systems for bacteria with key roles in the cycle of carbon was confirmed by additional determinations of heterotrophic (Fe super(3+), and SO sub(4) super(2) super(-) reducing, proteolytic, chitinolytic, and agarolytic) bacteria.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/1984/acte-990.pdf
Editor: | Actes de colloques. Ifremer Brest [ACTES COLLOQ. IFREMER.]. 1986
Relação: | http://archimer.ifremer.fr/doc/00000/990/
Formato: | application/pdf