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0
A
B
C
D
0.2
E
D
0.4
0.6
F
G
Oxygen-sul de
interface
0.8
H
I
J
1.0
J
Figure 4.1. Drawing of typical microbial mat from guerrero negro, Baja California, mexico,
based on transmission electron microscope (tem) observations. the oxygen-sulide inter-
face is located during the day at about 0.8 mm depth. the letters refer to A, diatoms;
B, Spirulina sp. (cyanobacterium); C, Oscillatoria spp. (cyanobacterium); D, Microcoleus
chthonoplastes (cyanobacterium); e, nonphotosynthetic bacteria; F, fragments of bacterial
mucilage; g, Chloroflexus spp. (green nonsulfur bacteria, capable of anoxygenic photosyn-
thesis); H, Beggiatoa spp. (nonphotosynthetic sulide-oxidizing bacteria); I, unidentified
grazer; J, abandoned cyanobacterial sheaths. Adapted from Canfield and Des marais (1991).
 
 
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