Regression coefficients, intercepts, and concentrations estimated to cause effects in 5% of species (HC5) for thiamethoxam acute toxicity species sensitivity distributions as calculated using the Weibull equationa
| y = ax + bb | No.c | HC5 (µg/L) | Likelihood of exceeding HC5 (%) | % of species impaired at median | % of species impaired at 75th percentile | % of species impaired at 90th percentile | % of species impaired at 95th percentile | % of species impaired at 99th percentile | |||
| Distribution | a | b | r2 | 0.0125 (µg/L) | 0.0250 (µg/L) | 0.0320 (µg/L) | 0.0538 (µg/L) | 0.4000 (µg/L) | |||
| All invertebrate acute 24–48‐h EC50s | 0.550 | –2.035 | 0.95 | 22 | 5.1 | 0.15 | 0.103 | 0.178 | 0.214 | 0.314 | 1.211 |
| Insect acute 48‐h EC50s | 0.727 | –1.732 | 0.94 | 8 | 1.3 | 0.51 | 0.092 | 0.189 | 0.241 | 0.397 | 2.161 |
| Invertebrate (excluding insect) acute 24–48‐h EC50s | 0.471 | –2.314 | 0.92 | 14 | 26.3 | 0.01 | 0.066 | 0.108 | 0.127 | 0.180 | 0.619 |
| All invertebrate acute 48‐h LC50s | 0.604 | –2.466 | 0.97 | 13 | 22.9 | 0.01 | 0.015 | 0.030 | 0.038 | 0.061 | 0.340 |
| Insect acute 48‐h LC50s | 0.758 | –2.303 | 0.96 | 6 | 7.4 | 0.12 | 0.009 | 0.022 | 0.029 | 0.055 | 0.460 |
| Invertebrate (excluding insect) acute 48‐h LC50s | 0.684 | –3.473 | 0.96 | 7 | 470.2 | <0.001 | 0.001 | 0.0002 | 0.0003 | 0.0007 | 0.0090 |
| y = ax + bb | No.c | HC5 (µg/L) | Likelihood of exceeding HC5 (%) | % of species impaired at median | % of species impaired at 75th percentile | % of species impaired at 90th percentile | % of species impaired at 95th percentile | % of species impaired at 99th percentile | |||
| Distribution | a | b | r2 | 0.0125 (µg/L) | 0.0250 (µg/L) | 0.0320 (µg/L) | 0.0538 (µg/L) | 0.4000 (µg/L) | |||
| All invertebrate acute 24–48‐h EC50s | 0.550 | –2.035 | 0.95 | 22 | 5.1 | 0.15 | 0.103 | 0.178 | 0.214 | 0.314 | 1.211 |
| Insect acute 48‐h EC50s | 0.727 | –1.732 | 0.94 | 8 | 1.3 | 0.51 | 0.092 | 0.189 | 0.241 | 0.397 | 2.161 |
| Invertebrate (excluding insect) acute 24–48‐h EC50s | 0.471 | –2.314 | 0.92 | 14 | 26.3 | 0.01 | 0.066 | 0.108 | 0.127 | 0.180 | 0.619 |
| All invertebrate acute 48‐h LC50s | 0.604 | –2.466 | 0.97 | 13 | 22.9 | 0.01 | 0.015 | 0.030 | 0.038 | 0.061 | 0.340 |
| Insect acute 48‐h LC50s | 0.758 | –2.303 | 0.96 | 6 | 7.4 | 0.12 | 0.009 | 0.022 | 0.029 | 0.055 | 0.460 |
| Invertebrate (excluding insect) acute 48‐h LC50s | 0.684 | –3.473 | 0.96 | 7 | 470.2 | <0.001 | 0.001 | 0.0002 | 0.0003 | 0.0007 | 0.0090 |
The percentage of species impaired by exposure to thimethoxam based on an exposure distribution at specific percentiles are also provided. Where multiple responses for the same species and time point were available, the lower concentration was used.
These values are transformed into units of log and probit for the purposes of regression and back‐transforms were used to calculate the intercepts. The distribution units were in μg/L.
Number of data points used in the ranking.
Regression coefficients, intercepts, and concentrations estimated to cause effects in 5% of species (HC5) for thiamethoxam acute toxicity species sensitivity distributions as calculated using the Weibull equationa
| y = ax + bb | No.c | HC5 (µg/L) | Likelihood of exceeding HC5 (%) | % of species impaired at median | % of species impaired at 75th percentile | % of species impaired at 90th percentile | % of species impaired at 95th percentile | % of species impaired at 99th percentile | |||
| Distribution | a | b | r2 | 0.0125 (µg/L) | 0.0250 (µg/L) | 0.0320 (µg/L) | 0.0538 (µg/L) | 0.4000 (µg/L) | |||
| All invertebrate acute 24–48‐h EC50s | 0.550 | –2.035 | 0.95 | 22 | 5.1 | 0.15 | 0.103 | 0.178 | 0.214 | 0.314 | 1.211 |
| Insect acute 48‐h EC50s | 0.727 | –1.732 | 0.94 | 8 | 1.3 | 0.51 | 0.092 | 0.189 | 0.241 | 0.397 | 2.161 |
| Invertebrate (excluding insect) acute 24–48‐h EC50s | 0.471 | –2.314 | 0.92 | 14 | 26.3 | 0.01 | 0.066 | 0.108 | 0.127 | 0.180 | 0.619 |
| All invertebrate acute 48‐h LC50s | 0.604 | –2.466 | 0.97 | 13 | 22.9 | 0.01 | 0.015 | 0.030 | 0.038 | 0.061 | 0.340 |
| Insect acute 48‐h LC50s | 0.758 | –2.303 | 0.96 | 6 | 7.4 | 0.12 | 0.009 | 0.022 | 0.029 | 0.055 | 0.460 |
| Invertebrate (excluding insect) acute 48‐h LC50s | 0.684 | –3.473 | 0.96 | 7 | 470.2 | <0.001 | 0.001 | 0.0002 | 0.0003 | 0.0007 | 0.0090 |
| y = ax + bb | No.c | HC5 (µg/L) | Likelihood of exceeding HC5 (%) | % of species impaired at median | % of species impaired at 75th percentile | % of species impaired at 90th percentile | % of species impaired at 95th percentile | % of species impaired at 99th percentile | |||
| Distribution | a | b | r2 | 0.0125 (µg/L) | 0.0250 (µg/L) | 0.0320 (µg/L) | 0.0538 (µg/L) | 0.4000 (µg/L) | |||
| All invertebrate acute 24–48‐h EC50s | 0.550 | –2.035 | 0.95 | 22 | 5.1 | 0.15 | 0.103 | 0.178 | 0.214 | 0.314 | 1.211 |
| Insect acute 48‐h EC50s | 0.727 | –1.732 | 0.94 | 8 | 1.3 | 0.51 | 0.092 | 0.189 | 0.241 | 0.397 | 2.161 |
| Invertebrate (excluding insect) acute 24–48‐h EC50s | 0.471 | –2.314 | 0.92 | 14 | 26.3 | 0.01 | 0.066 | 0.108 | 0.127 | 0.180 | 0.619 |
| All invertebrate acute 48‐h LC50s | 0.604 | –2.466 | 0.97 | 13 | 22.9 | 0.01 | 0.015 | 0.030 | 0.038 | 0.061 | 0.340 |
| Insect acute 48‐h LC50s | 0.758 | –2.303 | 0.96 | 6 | 7.4 | 0.12 | 0.009 | 0.022 | 0.029 | 0.055 | 0.460 |
| Invertebrate (excluding insect) acute 48‐h LC50s | 0.684 | –3.473 | 0.96 | 7 | 470.2 | <0.001 | 0.001 | 0.0002 | 0.0003 | 0.0007 | 0.0090 |
The percentage of species impaired by exposure to thimethoxam based on an exposure distribution at specific percentiles are also provided. Where multiple responses for the same species and time point were available, the lower concentration was used.
These values are transformed into units of log and probit for the purposes of regression and back‐transforms were used to calculate the intercepts. The distribution units were in μg/L.
Number of data points used in the ranking.
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