Imaging Oxygen Distribution in Marine Sediments. The Importance of Bioturbation and Sediment Heterogeneity - Laboratoire de Microbiologie, de Géochimie et d'Ecologie Marines Access content directly
Journal Articles Acta Biotheoretica Year : 2008

Imaging Oxygen Distribution in Marine Sediments. The Importance of Bioturbation and Sediment Heterogeneity

Abstract

The influence of sediment oxygen heterogeneity, due to bioturbation, on diffusive oxygen flux was investigated. Laboratory experiments were carried out with 3 macrobenthic species presenting different bioturbation behaviour patterns:the polychaetes Nereis diversicolor and Nereis virens, both constructing ventilated galleries in the sediment column, and the gastropod Cyclope neritea, a burrowing species which does not build any structure. Oxygen two-dimensional distribution in sediments was quantified by means of the optical planar optode technique. Diffusive oxygen fluxes (mean and integrated) and a variability index were calculated on the captured oxygen images. All species increased sediment oxygen heterogeneity compared to the controls without animals. This was particularly noticeable with the polychaetes because of the construction of more or less complex burrows. Integrated diffusive oxygen flux increased with oxygen heterogeneity due to the production of interface available for solute exchanges between overlying water and sediments. This work shows that sediment heterogeneity is an important feature of the control of oxygen exchanges at the sediment–water interface.

Domains

Hydrology
Fichier principal
Vignette du fichier
Pischedda_6086.pdf (370.93 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-00256326 , version 1 (15-02-2022)

Identifiers

Cite

Laura Pischedda, Jean-Christophe Poggiale, Philippe Cuny, Franck Gilbert. Imaging Oxygen Distribution in Marine Sediments. The Importance of Bioturbation and Sediment Heterogeneity. Acta Biotheoretica, 2008, 56 (1-2), pp.123-135. ⟨10.1007/s10441-008-9033-1⟩. ⟨hal-00256326⟩
220 View
79 Download

Altmetric

Share

Gmail Facebook X LinkedIn More