Table 1. Details of samples used in this study.
| Sample | Date 2007 | Location | Coordinates | Depth (m) | Current (km h−1) | Water temperature (°C) | pH | DO (mg l−1) |
Volume (l) |
|
|---|---|---|---|---|---|---|---|---|---|---|
| Initial | Final | |||||||||
| SOLa | 07/18 | Solimões River— Ilha da Machantaria | 03°16′S 60°02′W | 1.5 | 5.7 | 27.8 | 6.5 | 2.36 | 10 | 0.01 |
| SOLb | 07/23 | 1.5 | 5.6 | 27.9 | 6.2 | 2.64 | 20 | 0.02 | ||
| SOLc | 07/26 | 1.5 | 5.9 | 27.9 | 6.0 | 2.84 | 20 | 0.02 | ||
| CUIa | 07/24 | Cuieiras River— at the source | 02°46′S 60°27′W | 1.5 | 0 | 27.8 | 4.0 | 3.2 | 80 | 0.08 |
| NEGa | 07/17 | Negro River— Tatu | 03°03′S 60°18′W | 1.5 | 3.5 | 28.7 | 4.7 | 3.12 | 100 | 0.10 |
| NEGb | 07/20 | 1.5 | 4.6 | 28.3 | 4.5 | 3.12 | 100 | 0.10 | ||
| NEGc | 07/25 | 1.5 | 3 | 28.6 | 4.2 | 3.23 | 100 | 0.10 | ||
| NEGd | 07/19 | Negro River— Educandos | 03°03′S 60°01′W | 1.5 | 0 | 28.7 | 4.8 | 2.6 | 40 | 0.04 |
Abbreviation: DO, dissolved oxygen.
a, b, c, d indicate the different samples from the same river.