Aerobic Microbial Respiration in 86-Million-Year-Old Deep-Sea Red Clay

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Science  18 May 2012:
Vol. 336, Issue 6083, pp. 922-925
DOI: 10.1126/science.1219424

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  1. Fig. 1

    Cruise track, sampling sites, and primary production along the cruise track. The primary production was estimated from Sea-WiFs remote-sensing data converted into integrated primary productivity averaged over 10 years by the Institute of Marine and Coastal Sciences Ocean Primary Productivity Team (Rutgers, State University of New Jersey) using the algorithms from (25). The shaded areas mark the data along the actual cruise track. The inserted graphs show the oxygen distribution in the sediment at the sampled sites. Sites 4 and 7 on the equator followed the trend in the other equatorial sites and are omitted for clarity only. At site 9 we retrieved only 4 m of core, but the profile was similar to sites 10 and 11. By site 11, we reoccupied the GPC-3 site that has been studied in great detail [e.g., (14)].

  2. Fig. 2

    Oxygen distribution in the seabed below the North Pacific Gyre at site 11. (A) Data originate from three independent sediment cores. The curve illustrates the fit used to calculate volume-specific oxygen consumption rates. (Inset) Data and fit for lower part of core. (B) Curve is the modeled volumetric oxygen consumption rates. Open circles are the cell-specific oxygen consumption rates obtained by dividing the volumetric oxygen consumption rate by cell counts.

  3. Fig. 3

    Oxygen profiles modeled from a constant influx of organic material but varying sediment accumulation rates. All profiles represent the same oxygen uptake rate at the sediment surface. Symbols show measured oxygen profiles from site 9 (circles) and site 11 (squares).