The Company of Biologists

Table 1.

Initial concentrations of taurine derivatives in the symbiont-containing tissues of three species from the East Pacific Rise and thiotaurine concentration in the same tissues exposed to Na₂S and Na₂S₂O₃

	Initial concentration (μmol g⁻¹)					Thiotaurine concentration (μmol g⁻¹) after exposure to:
	Thiotaurine	Hypotaurine	Taurine	Na₂S 0.25 mmol 1⁻¹	Na₂S 0.5 mmol 1⁻¹	Na₂S 1 mmol 1⁻¹	Na₂S₂O₃ 1 mmol 1⁻¹
Calyptogena magnifica
1	152	21	36	154	158	167	157
2	66	30	34	92	92	93	77
3	122	43	30	157	156	152	132
4	132	16	42	140	141	143	143
5	115	25	48	127	122	123	125
6	88	9	22	91	88	89	89
Bathymodiolus thermophilus
1	80	77	62	122	111	84	121
2	105	39	46	113	109	76	112
3	59	76	24	82	75	67	80
4	41	47	36	56	59	35	49
5	44	63	35	88	77	13	62
Riftia pachyptila
1	5	150	266	73	258	329	10
2	113	119	143	240	90	203	116
3	92	99	27	194	197	212	118
4	125	110	41	236	227	233	147

	Initial concentration (μmol g⁻¹)					Thiotaurine concentration (μmol g⁻¹) after exposure to:
	Thiotaurine	Hypotaurine	Taurine	Na₂S 0.25 mmol 1⁻¹	Na₂S 0.5 mmol 1⁻¹	Na₂S 1 mmol 1⁻¹	Na₂S₂O₃ 1 mmol 1⁻¹
Calyptogena magnifica
1	152	21	36	154	158	167	157
2	66	30	34	92	92	93	77
3	122	43	30	157	156	152	132
4	132	16	42	140	141	143	143
5	115	25	48	127	122	123	125
6	88	9	22	91	88	89	89
Bathymodiolus thermophilus
1	80	77	62	122	111	84	121
2	105	39	46	113	109	76	112
3	59	76	24	82	75	67	80
4	41	47	36	56	59	35	49
5	44	63	35	88	77	13	62
Riftia pachyptila
1	5	150	266	73	258	329	10
2	113	119	143	240	90	203	116
3	92	99	27	194	197	212	118
4	125	110	41	236	227	233	147

Each line corresponds to one single specimen.

Among the 26 amino compounds measured thiotaurine, hypotaurine and taurine were the only ones to vary in concentration during the experiments.

Taurine concentration only decreased in the trophosome of R. pachyptila exposed to Na₂S.

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