Table 1

Selected biomarkers, their δ13C values, and most likely biological sources in the Black Sea microbial mat. The reference column cites previous reports on these compounds in other methane-related environments. For additional information see SOM.

Compoundδ13C (‰)SourceReference
Crocetane (2,6,11,15- tetramethylhexadecane)−94.7  ±  0.7Archaea (?)(3, 10, 15,19,24–27)
2,6,10,15,19-Pentamethylicosane−95.6 ± 0.1Archaea Methanosarcinales(3, 10,15, 19,24–27)
Archaeol (2,3-di-O-phytanyl-sn-glycerol)−87.9  ±  0.6Archaea(3, 8, 10,19, 24–26,28)
sn-2-Hydroxyarchaeol (2-O-3-hydroxyphytanyl-3-O-phytanyl-sn-glycerol)−90.0  ±  1.0Archaea Methanosarcinales(3,8, 10, 19, 28)
Biphytane (from tetraether after HI/LiAlH4 cleavage)−91.6  ±  0.6Archaea(15)
n-Tricos-10-ene−90.9  ±  0.3Unknown (bacteria?)(27)
Anteiso-pentadecanoic acid (12-methyltetradecanoic acid)−83.9  ±  0.1SRB(3, 10, 19,26,28)
1,2-di-O-12-Methyltetradecyl-sn-glycerol−89.5  ±  0.5SRB(19, 28)