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Table T3. Results of methanogenic enrichment cultures with complex or hydrocarbon substrates after 12 months incubation, Expedition 347.

Core, section,
interval (cm)
No
substrate
Monomer
mix
Polymer
mix
Spirulina
Hexadecane
Ethylbenzene
Methylnaphthalene
Dotriacontan
347-M0059C-
3H-2, 40–45 (+)
6H-1, 95–100 (+)
9H-1, 95–100 (+)
12H-2, 65–70 (+)
15H-1, 100–105 (+)
24H-2, 65–70
347-M0059E-
4H-2, 55–60
7H-2, 115–120
10H-2, 140–145 +  
13H-2, 125–130 + ++ + + (+)
16H-2, 90–95
25H-2, 105–110
347-M0060B-
6H-2, 75–80
9H-2, 55–60
12H-2, 50–55
15H-2, 45–50
23H-2, 20–25
24H-2, 50–55
28H-2, 110–115
347-M0063E-
3H-2, 60–65 + +
6H-2, 50–55 (+)
9H-2, 45–50
12H-2, 62–67 + + + + + + + (+)
15H-2, 45–50
18H-2, 25–30
21H-2, 25–30 (+) (+) (+) (+) (+)
32H-2, 90–95
42H-2, 120–125
347-M0065C-
4H-2, 60–65
7H-2, 65–70
10H-2, 60–65
12H-2, 110–115

(+) = CH4 production only slightly higher than in controls, + = CH4 formation substantially higher than in controls, ++ = strong and long-lasting CH4 formation activity, — = no CH4 formation.

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