TABLE 1.

Characteristics of Fe mats at Loihi, including total number of cells and oxide morphotype^e

Sample location	Sample no.	Depth (m below sea level)	Temp (°C)a	Mat density (g/ml)	Total Fe (mg/g [dry wt])	No. of cells (SD)b	Dilution seriesc	Dominant morphotype(s)d
Pele's Pit, Ikaika vents, marker 20	393, 1-4	1,317	68	0.170	55	2.93 × 108 (4.2 × 107)	10−4	Filaments
Pele's Pit, Ikaika vents, lower jets	393, 5-8	1,298	167	0.268	81	6.9 × 107 (1.6 × 107)	10−7	Amorphous
South rift, Naha vents, marker 1	396, 2-4	1,325	10	0.097	183	2.45 × 108 (7.94 × 107)	10−6 (10−4 at 12°C)	Filaments
Upper South rift, Pohaku vents, marker 27	396, 6	1,196	17	0.049	77	9.33 × 107 (8.6 × 106)	10−5	Amorphous, sheaths
Upper South rift, Pohaku vents, marker 27	396, 7-8	1,196	17	0.157	153	1.26 × 108 (3.1 × 107)	10−7	Amorphous, filaments
Pele's Pit, Ikaika vents, lower jets	397, 1-4	1,295	165	0.140	141	4.61 × 108 (6.5 × 107)	10−6	Amorphous
Pele's Pit, Ikaika vents, upper jets	397, 5	1,289	167	ND	ND	ND	ND	Amorphous
Pele's Pit, Ikaika vents, near marker 15	398, 5-6	1,290	113	0.115	152	1.54 × 108 (4 × 107)	10−6	Amorphous, filaments

^aAll temperatures are the maximums measured in the vent orifice closest to the sampling site.

^bThese values are expressed per milliliter (wet weight) of mat.

^cThe highest dilution in a series that yielded growth.

^dThe predominant iron oxide morphotypes (Fig. 4 and 5).

^eND, not determined.