Table 1.
Physical and chemical parameters evaluated in rivers with cyanobacterial mats from central and southeastern basins of Mexico. T, temperature; TDS, total dissolved solids; K25, specific conductance; DO, dissolved oxygen; SRP, soluble reactive phosphorus; NID, dissolved inorganic nitrogen, N-NH4, ammonium; N-NO2, nitrites; N-NO3, nitrates. Land use: HS, human settlement; TF, tropical forest; RA, rainfed agriculture; MF, mountain mesophilic. Forest; D, dams
| Basin and site | CyanoHAMs Taxonomic identity (16S gene amplification) |
Percent coverage (%) |
T | pH | K25 (µS/cm) |
DO (mg/L) |
SRP | N-NH4 | N-NO2 | N-NO3 | NID | NID:SRP ratio |
Land use |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mexico Basin | |||||||||||||
| 1. Monte Alegre (MA) | Nostoc tlalocii | 70 | 7.6 | 8.0 | 52 | 8.9 | 0.275 | 0.095 | 0.010 | 0.087 | 0.192 | 0.7 | MF |
| 2. Magdalena River (SD) |
Cyanoplacoma sp. Wilmottia aff. murrayi |
90 20 |
9.2 | 6.5 | 50 | 8 | 0.33 | 0.015 | 0.005 | 1.25 | 1.27 | 3.8 | MF/HS |
| 3. Iturbide Dam (PI) | Nostoc tlalocii | 30 | 9.5 | 7.5 | 58 | 7.9 | 0.445 | 0.01 | 0.025 | 0.001 | 0.036 | 0.08 | MF |
| 4. San Miguel (SM) |
Compactonostoc sp. Cyanoplacoma sp. Wilmottia aff. murrayi |
40 15 30 |
14.3 | 6.2 | 74 | 8 | 0.74 | 0.15 | 0.003 | 0.025 | 0.178 | 0.2 | MF |
| 5. San Rafael Channel (CSR) | Compactonostoc sp. | 30 | 9.9 | 7.2 | 141 | 7.9 | 0.375 | 0.03 | 0.003 | 0.01 | 0.043 | 0.1 | MF/D |
| Balsas Basin | |||||||||||||
| 6. Arroyo Monarca (AM) | Cyanoplacoma. sp. | 15 | 12.7 | 6.2 | 90 | 8 | 1.05 | 0.12 | 0.006 | 1.6 | 1.706 | 1.6 | MF/D |
| 7. Agua Blanca (AB) | Cyanoplacoma. sp | 40 | 15.1 | 7.1 | 176 | 9 | 1.41 | 0.33 | 0.005 | 1.7 | 0.585 | 0.4 | MF/HS |
| Panuco Basin | |||||||||||||
| 8. Meco (ME) |
Oxynema sp. Dichothrix aff. willei |
2 35 |
25.6 | 7.3 | 1215 | 6.1 | 0.07 | 0.01 | 0.003 | 0.25 | 0.263 | 3.7 | HS |
| 9. Tambaque (TA) | Nostoc montejanii | 30 | 23.5 | 6.9 | 1528 | 8.4 | 0.02 | 0.06 | 0.002 | 0.035 | 0.097 | 4.8 | TF |
| Usumacinta Basin | |||||||||||||
| 10. Carrizal (EC) | Ancylothrix sp. | 20 | 23.7 | 7.8 | 602 | 7.7 | 0.955 | 3.18 | 0.46 | 29.99 | 33.17 | 35.2 | RA |