TABLE 1.

Source of Halomonas strains used in hydrostatic pressure experiments and their basic growth features at sea surface pressure

Strain (reference)	Sample characteristics			Growth temperature (°C) at 0.1 MPa and 4% total salts			Growth salinity (% total salts) at 0.1 MPa and 30°C
	Sample type	Depth (m)	Temp (°C)	Tmin	Topt	Tmax	Smin	Sopt	Smax
H. axialensis (32, 33)	Low-temperature hydrothermal fluida	1,533	27	−1	30	35	0.5	4	24
H. meridiana strain Slthf1 (32,33)	Low-temperature hydrothermal fluida	2,580	9	−1	20-35	40	0.5	2-7	22
H. hydrothermalis (32,33)	Low-temperature hydrothermal fluida	2,580	9	2	30	40	0.5	4-7	22
H. pacifica (3, 38)	Tropical seawater	0	NDb	2-4c	NDb	45	0	0.5-3	20

^aThe salt content of hydrothermal fluids (measured as chlorinity) was ∼90% that of ambient seawater levels (33).

^bND, not determined.

^cGrowth at 2°C may depend on the medium. The T_min is reported as 2 or 4°C (32, 38).