Open Access
Table 2
BACI comparisons of fish assemblages and physico-chemical parameters of water in the Barnoi River at various times from before to after waste dumping, obtained through linear mixed-effects modelling.
| Factors | F | P | LSmeans | |
|---|---|---|---|---|
| Fish abundance | ||||
| Before–After (BA) | 6.60 | 0.022 | ||
| Upstream–Downstream (CI) | 94.0 | 0.001 | ||
| BA × CI | 119.61 | < 0.001 | ||
| Upstream–Before (CB) | 5.181 | |||
| Downstream–Before (IB) | 5.182 | |||
| Upstream–After (CA) | 5.083 | |||
| Downstream–After (IA) | 4.319 | |||
| Fish species richness | ||||
| Before–After (BA) | 123.84 | <0.001 | ||
| Upstream-Downstream (CI) | 170.27 | <0.001 | ||
| BA × CI | 181.80 | <0.001 | ||
| Upstream–Before (CB) | 5.723 | |||
| Downstream–Before (IB) | 5.741 | |||
| Upstream–After (CA) | 5.480 | |||
| Downstream–After (IA) | 4.397 | |||
| Abundance of locally threatened spp. | ||||
| Before–After (BA) | 18.42 | <0.001 | ||
| Upstream–Downstream (CI) | 72.09 | <0.001 | ||
| BA × CI | 19.60 | <0.001 | ||
| Upstream–Before (CB) | 222.526 | |||
| Downstream–Before (IB) | 224.158 | |||
| Upstream–After (CA) | 173.789 | |||
| Downstream–After (IA) | 69.211 | |||
| pH | ||||
| Before–After (BA) | 183.54 | <0.001 | ||
| Upstream–Downstream (CI) | 63.21 | 0.001 | ||
| BA × CI | 370.50 | <0.001 | ||
| Upstream–Before (CB) | 6.938 | |||
| Downstream–Before (IB) | 7.083 | |||
| Upstream–After (CA) | 6.854 | |||
| Downstream–After (IA) | 4.813 | |||
| Dissolved oxygen | ||||
| Before–After (BA) | 61.40 | <0.001 | ||
| Upstream–Downstream (CI) | 1194.90 | <0.001 | ||
| BA × CI | 1260.30 | <0.001 | ||
| Upstream–Before (CB) | 5.168 | |||
| Downstream–Before (IB) | 5.194 | |||
| Upstream–After (CA) | 5.045 | |||
| Downstream–After (IA) | 3.106 | |||
| Water temperature | ||||
| Before–After (BA) | 1.72 | 0.211 | ||
| Upstream–Downstream (CI) | 0.46 | 0.501 | ||
| BA × CI | 0.47 | 0.499 | ||
| Upstream–Before (CB) | 24.646 | |||
| Downstream–Before (IB) | 24.500 | |||
| Upstream–After (CA) | 26.209 | |||
| Downstream–After (IA) | 26.208 | |||
| Water transparency | ||||
| Before–After (BA) | 11.28 | 0.005 | ||
| Upstream–Downstream (CI) | 170.34 | <0.001 | ||
| BA × CI | 203.10 | <0.001 | ||
| Upstream–Before (CB) | 31.500 | |||
| Downstream–Before (IB) | 32.167 | |||
| Upstream–After (CA) | 33.083 | |||
| Downstream–After (IA) | 17.917 | |||
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