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Fig. 5. Relationship between animal positioning (frequency distribution at different depths shown by the grey bars; scale, lower x axis) and O2 profiles (one symbol type per O2 profile; scale, upper x axis) as a function of sediment depth in naturally occurring (open and closed triangles, circles and open squares, left panel) and experimentally manipulated O2-gradients (water column PO2=21 or 40 kPa). Analyses were performed at days (d) 0, 4, 7 and 11. As O2 penetration velocity varied from core to core for the same water column, values of PO2, O2 profiles are grouped by similar near anoxic-zone depths (thickness, 1 mm; dotted lines) independent of exposure time. The animal's position followed the O2 profiles, and were independent of sediment depth and time. N is the number of analysed cores per O2 profile penetration depth.





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