TABLE 1.

Comparison of methane oxidation rate and MOA populationsa

SedimentMean methane oxidation rate (nmol/g of sediment per day) ± SE (low rate, high rate)Mean no. of ANME 2c-specific 16s rRNA/g of sediment ± SE
Core 1 before incubation32.9 ± 13.9 (9.20, 45.3)4.73 (±1.65) × 105
Core 1 after incubation28.7 ± 3.57 (23.8, 33.6)8.16 (±2.29) × 105
Core 2 before incubation27.7 ± 10.2 (15.2, 43.2)5.11 (±2.89) × 105
Core 2 after incubation29.0 ± 6.80 (21.0, 38.5)4.13 (±0.98) × 105
Core 4 before incubation0.44 ± 2.10 (−2.82, 2.30)N/D
Core 4 after incubation19.2 ± 9.60 (9.80, 35.2)2.93 (±0.32) × 105
AMIS circulating seawater7.65 ± 3.181.37 (±2.90) × 103
  • a A comparison was made of methane oxidation rate and ANME-2c MOA populations (ANME 2c-specific 16s rRNA copy number per gram of sediment) from marine sediments in Monterey Canyon before and after 24 weeks of incubation on the AMIS sediment incubation system. Core 1, anoxic sediments collected from the center of a seep; core 2, anoxic sediments collected from the periphery of the seep, within the clam field; core 4, oxic sediments collected away from any visible seepage. Five independent samples were used to determine all mean ± standard error values. Low rate and high rate are the lowest and highest methane oxidation rates measured for that sediment core. The AMIS circulating seawater values are expressed per milliliter of seawater. N/D, not detected