Figure 1

Figure 2

Figure 3

Figure 4

Density and share (%) of oligochaete taxa in samples collected from the lower course of the Bolina River
| Taxa | 20 Jun.2017 | 04 Sep.2017 | 10 Oct. 2017 | 21 Jan. 2018 | ||||
|---|---|---|---|---|---|---|---|---|
| ind. m−2 | % | ind. m−2 | % | ind. m−2 | % | ind. m−2 | % | |
| Nais elinguis (Müller, 1773) | 808 | 9.5 | ||||||
| Paranais litoralis (Müller, 1780) | 28 | 63.6 | 132 | 94.2 | 132 | 71.7 | 7604 | 89.1 |
| Monopylephorus limosus (Hatai,1898) | 4 | 2.9 | ||||||
| Enchytraeidae juve. | 16 | 36.4 | 4 | 2.9 | 52 | 28.3 | 124 | 1.4 |
| Total density | 60 | 140 | 184 | 8536 | ||||