Geochemically induced shifts in catabolic energy yields explain past ecological changes of diffuse vents in the East Pacific Rise 9°50'N area

Table 2 Affinities for different catabolic reactions in kJ and normalized affinities in J per e^- and Kg Vent-fluid at the Southern Area (TWP)

Southern Area	5 Hydrogenotrophic sulfate reduction		6 Hydrogenotrophic methanogenesis		7 Anaerobe oxidation of methane
	Measured	Predicted	Measured	Predicted	Measured	Predicted
	kJ		kJ		kJ
February-March 1992	128.6	156.7	94.1	128.0	34.5	28.7
October 1994	129.3	165.1	93.4	135.3	35.9	29.8
November 1995	104.3	161.2	70.1	130.8	34.2	30.4
November 1997	103.9	151.1	73.8	122.5	30.1	28.7
April 2000	88.4	130.4	63.9	105.7	24.7	24.5
	J per e^- and Kg vent fluid		J per e^- and Kg vent fluid		J per e^- and Kg vent fluid
February-March 1992	1.34	30.28	0.98	24.73	9.07	0.73
October 1994	0.64	41.50	0.46	34.01	1.64	0.41
November 1995	0.05	23.57	0.03	19.13	1.27	0.38
November 1997	0.08	16.34	0.06	13.24	0.58	0.42
April 2000	0.09	10.95	0.06	8.88	0.31	0.33

ISSN: 1467-4866