Imaging oxygen distribution in marine sediments. The importance of bioturbation and sediment heterogeneity

被引：72

作者：

Pischedda, L. ^{[1
]}

Poggiale, J. C. ^{[1
]}

Cuny, P. ^{[1
]}

Gilbert, F. ^{[2
]}

机构：

[1] Univ Mediterranee, Ctr Oceanol Marseille, Lab Microbiol Geochim & Ecol Marines, CNRS,UMR 6117, F-13288 Marseille 9, France

[2] Univ Toulouse Paul Sabatier, CNRS, UMR 5245, Lab Ecol Fonctionnelle,Ecolab,INP ENSAT, F-31055 Toulouse 4, France

来源：

ACTA BIOTHEORETICA | 2008年 / 56卷 / 1-2期

关键词：

bioturbation; heterogeneity; oxygen; planar optode; macrofauna;

D O I：

10.1007/s10441-008-9033-1

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：123 / 135

页数：13