Table 3 ANCOVA results: ANCOVA table testing the effect of the ratios between metals and DOC (independent covariate) on the log-transformed ratios between toxicity indices estimated by BLM and bioassays (dependent variable) for two species D. magna and P. subcapitata (nominal factors)
|  | Al/TOC | Fe/TOC | ∑FeAl/TOC (mol/g) | ∑Metals/TOC (mol/g) |
|---|---|---|---|---|
R 2 | 0.739 | 0.945 | 0.980 | 0.985 |
Root mean square error | 0.590 | 0.270 | 0.163 | 0.142 |
Analysis of variance | ||||
 F 3.7 ratio | 3.77 | 23.04 | 65.59 | 87.37 |
 Prob > F | 0.1164 | 0.0055 | 0.0007 | 0.0004 |
 Effect tests: | ||||
  Species | 0.03 | 0.002 | 0.0003 | 0.0002 |
  log(Me/TOC) | 0.5493 | 0.0144 | 0.0018 | 0.0010 |
  Species x log(Me/TOC) | 0.93 | 0.79 | 0.80 | 0.72 |
Estimated slope of covariate ± SE | ||||
 log(Me/TOC) | −0.069 ± 0.11 | −0.046 ± 0.01 | −2.531 ± 0.34 | −2.655 ± 0.31 |