TABLE 6.
Generated EC20s across a range of community indices
| Community indexa | Modelb | Plot | Treatment |
EC20 |
Model parameterse |
||||
|---|---|---|---|---|---|---|---|---|---|
| % C | Exposure | Concnc | SEd | b | d | e | |||
| Sobs | W2.3 | P1 | 5 | Short | NAf | NA | −0.03 | 171.0 | 1.9 |
| SE (25.32) | P2 | 8 | Short | 140 | 80 | −0.44 | 91.9 | 403.4 | |
| df = 23 | P3 | 36 | Short | 30 | 340 | −0.15 | 124.8 | 871.3 | |
| P4 | 6.7 | Long | 1,300 | 1,000 | −0.66 | 111.4 | 2,763.7 | ||
| ACE | W2.3 | P1 | 5 | Short | NA | NA | 0.04 | 154.0 | 4,867.1 |
| SE (26.17) | P2 | 8 | Short | 20 | 220 | −0.26 | 94.9 | 149.1 | |
| df = 23 | P3 | 36 | Short | NA | NA | −0.03 | 153.2 | 51.5 | |
| P4 | 6.7 | Long | 1,300 | 2,000 | −0.53 | 103.2 | 3,118.4 | ||
| Chao1 | W2.3 | P1 | 5 | Short | NA | NA | 0.00 | 157.3 | 0.00001 |
| SE (20.5) | P2 | 8 | Short | 30 | 16 | −0.28 | 93.9 | 146.6 | |
| df = 23 | P3 | 36 | Short | 11,000 | 6,400 | −0.61 | 97.9 | 23,398 | |
| P4 | 6.7 | Long | 1,500 | 620 | −0.59 | 109.1 | 3,334 | ||
| Shannon (H′) | W2.3 | P1 | 5 | Short | 8,100 | 850 | −1.91 | 98.8 | 10,384 |
| SE (7.14) | P2 | 8 | Short | 250 | 110 | −0.40 | 99.9 | 816.4 | |
| df = 23 | P3 | 36 | Short | 2,200 | 1,900 | −0.28 | 98.5 | 11,865 | |
| P4 | 6.7 | Long | 3,700 | 5,300 | −0.21 | 102.3 | 36,297 | ||
| Pielou's evenness (J′) | W2.3 | P1 | 5 | Short | 10,400 | 830 | −1.13 | 100.5 | 15,863 |
| SE (3.30) | P2 | 8 | Short | 140 | 470 | −0.24 | 102.0 | 9,992.5 | |
| df = 23 | P3 | 36 | Short | 50 | 390 | −0.09 | 125.4 | 11,809 | |
| P4 | 6.7 | Long | NA | NA | 50,273 | 145.6 | 882.4 | ||
| Weighted UniFrac | W2.3 | P1 | 5 | Short | 10 | 1.28 | −0.13 | 159.4 | 6.42 |
| SE (7.41) | P2 | 8 | Short | 60 | 110 | −0.26 | 91.9 | 348.4 | |
| df = 23 | P3 | 36 | Short | 10 | 0.16 | −0.12 | 172.9 | 1.98 | |
| P4 | 6.7 | Long | 940 | 750 | −0.41 | 93.4 | 3,027.9 | ||
| Acidobacteria/Proteobacteria ratio | LL3 | P1 | 5 | Short | 10 | 56 | 0.38 | 1.3 | 184.1 |
| SE (3.4) | P2 | 8 | Short | 40 | 110 | 1.03 | 1.04 | 159.5 | |
| P3 | 36 | Short | 4,500 | 2,700 | 1.05 | 1.7 | 17,195 | ||
| P4 | 6.7 | Long | 10 | 0.14 | 0.24 | 2.06 | 2.7 | ||
| nifH | W1.3 | P1 | 5 | Short | NA | NA | −0.02 | 282.5 | 15,863 |
| SE(25.39) | P2 | 8 | Short | NA | NA | 0.01 | 320.4 | 9,992.5 | |
| df = 90 | P3 | 36 | Short | 10 | 0.1 | 0.13 | 244.0 | 11,809 | |
| P4 | 6.7 | Long | 10 | 0.1 | 0.09 | 219 | 882.4 | ||
| amoA | W2.3 | P1 | 5 | Short | 10 | 0.06 | −0.16 | 214. | 0.4 |
| SE (17.0) | P2 | 8 | Short | 410 | 240 | −0.40 | 104.2 | 1,356.6 | |
| df = 90 | P3 | 36 | Short | 200 | 490 | −0.25 | 113.7 | 1,337.6 | |
| P4 | 6.7 | Long | 10 | 0.06 | −0.20 | 228.4 | 0.2 | ||
| nosZ | W2.3 | P1 | 5 | Short | 130 | 110 | 0.54 | 1,244.0 | 2,066.2 |
| SE (17.37) | P2 | 8 | Short | 740 | 540 | 0.78 | 1,702.2 | 5,119.1 | |
| df = 90 | P3 | 36 | Short | 520 | 830 | 5.84 | 526.2 | 671.5 | |
| P4 | 6.7 | Long | 30 | 41 | 0.66 | 605.6 | 306.8 | ||
a
Sobs, species observed; ACE, abundance-based coverage estimation; nifH, amoA, and nosZ, the abundance of functional genes within the nitrogen cycle as determined through qPCR.
b
The best-fitting dose response curve for the data as determined by AIC. W2.3, Weibull 2 curve/3 parameters; W1.3, Weibull 1 curve/3 parameters; LL3, log logistic curve/3 parameters.
c
The concentration that corresponds to a 20% effective change on the community.
d
The associated standard error of the EC20 estimate only.
e
Model parameters are defined as b = relative slope, d = upper limit, and e = point of inflection.
f
NA, no reliable dose response curve could be fitted.