Table 6.
The top models, based on generalised linear mixed models (see Table 5), explaining species richness and diversity by habitat (the four different sugarcane growth stages and native savanna) and season (wet and dry). Also, shown are parameter estimates (β), standard errors (SE), p-values, and confidence intervals; None of the parameters overlap zero and therefore all are significant.
|
β |
SE |
z value |
Pr (>|z|) |
Confidence intervals |
||
|
2.50% |
97.50% |
|||||
| Species richness | ||||||
| Intercept (sugarcane-emerging, season – dry) | 1.204 | 0.102 | 11.8 | <2e-16 | 0.999 | 1.400 |
| Season-wet | 0.157 | 0.163 | 0.964 | 0.335 | -0.167 | 0.473 |
| Sugarcane -medium | 0.404 | 0.141 | 0.862 | 0.004 | 0.127 | 0.682 |
| Savanna | 1.433 | 0.114 | 12.5 | <2e-16 | 1.209 | 1.661 |
| Sugarcane- short | 0.282 | 0.139 | 2.028 | 0.043 | 0.009 | 0.555 |
| Sugarcane-tall | 0.125 | 0.114 | 1.090 | 0.276 | -0.097 | 0.354 |
| Season-wet x sugarcane-medium | -0.088 | 0.208 | -0.427 | 0.669 | -0.491 | 0.321 |
| Season-wet x savanna | 0.002 | 0.170 | 0.012 | 0.991 | -0.327 | 0.339 |
| Season -wet x sugarcane - short | -0.483 | 0.235 | -2.055 | 0.040 | -0.947 | -0.023 |
| Season -wet x sugarcane-tall |
0.025 |
0.179 |
0.141 |
0.888 |
-0.323 |
0.381 |
| β | SE | t value | Pr (>|z|) |
Confidence intervals |
||
|
2.50% |
97.50% |
|||||
| Shannon diversity | ||||||
| Intercept (sugarcane – emerging, season – dry) | 0.986 | 0.074 | 13.3 | <2e-16 | 0.840 | 1.134 |
| Season-wet | 0.104 | 0.124 | 0.837 | 0.403 | -0.142 | 0.349 |
| Sugarcane -medium | 0.418 | 0.114 | 3.67 | 0.0002 | 0.194 | 0.641 |
| Savanna | 1.415 | 0.096 | 14.8 | <2e-16 | 1.221 | 1.602 |
| Sugarcane- short | 0.137 | 0.084 | 2.00 | 0.046 | 0.004 | 0.427 |
| Sugarcane-tall | 0.104 | 0.124 | 1.63 | 0.105 | -0.032 | 0.303 |
| Season-wet x sugarcane-medium | -0.056 | 0.168 | -0.332 | 0.740 | -0.387 | 0.276 |
| Season-wet x savanna | 0.102 | 0.143 | 0.712 | 0.477 | -0.181 | 0.385 |
| Season -wet x sugarcane - short | -0.353 | 0.177 | -1.994 | 0.047 | -0.702 | -0.005 |
| Season -wet x sugarcane-tall | 0.035 | 0.138 | 0.256 | 0.800 | -0.181 | 0.385 |