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. 2000 Oct;66(10):4279–4291. doi: 10.1128/aem.66.10.4279-4291.2000

FIG. 4.

FIG. 4

Diel fluctuations in stratified microbial mats. (A and B) Cyano/green (A) and PSB/pink (B) layers from Field Site 1 of Great Sippewissett Salt Marsh sampled over a dusk-to-dusk 24-h period in July 1997. (C and D) Cyano/green (C) and PSB/pink (D) layers from Great Sippewissett sampled over a 24-h dusk-to-dusk period in November 1998. (E) Composite of the photosynthetic layers of mat from the Ebro Delta, Spain, sampled over a noon-to-noon period. Bars are as in the legend to Fig. 3. All measurements were normalized to organic carbon.