Table 2.
Pigment characteristics of the microbial mat layers as defined in Table 1.
| Black layer | Pink layer | Green layer | |
|---|---|---|---|
| CONCENTRATION (μg g−1 DRY WEIGHT) | |||
| Chlorophyll a | 62.5 | 54.7 | 429.8 |
| PIGMENT RATIOS | |||
| Red-scytonemin | 0.14 | 0.06 | <0.01 |
| Scytonemin | 0.17 | 0.06 | <0.01 |
| Keto-mmp | 0.28 | 0.41 | <0.01 |
| Fucoxanthin | n.d. | n.d. | 0.06 |
| Myxoxanthin | n.d. | n.d. | 0.03 |
| Alloxanthin | n.d. | n.d. | 0.01 |
| Zeaxanthin | n.d. | n.d. | 0.06 |
| Lutein | n.d. | n.d. | 0.01 |
| Canthaxanthin | 0.13 | 0.17 | 0.02 |
| Echinenone | 0.14 | 0.12 | 0.04 |
| β-carotene | 0.16 | 0.14 | 0.18 |
| Photoprotective carotenoids | 0.27 | 0.29 | 0.14 |
| Photosynthetic carotenoids | n.d. | n.d. | 0.39 |
| Total carotenoids | 0.72 | 0.84 | 0.42 |
The pigment ratios are per unit by weight. The photoprotective carotenoids values are for summation of echinenone, zeaxanthin, lutein, and canthaxanthin. The photosynthetic carotenoids are for fucoxanthin and alloxanthin. The abbreviations used are: keto-mmp, 4-ketomyxol-2′-methylpentoside; n.d., not detectable.