CSEMP assessment of mercury in biota at Roa Island (Morecambe Bay)
Statistical analysis
Trend assessment
Analysis of variance
Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) | |
---|---|---|---|---|---|---|---|---|
mean | 1 | -11.68 | -9.88 | 8.84 | -17.68 | |||
linear | 2 | -9.68 | -6.13 | 8.84 | -17.68 | 0.002 | 1 | 0.9623 |
smooth (df = 2) | 3 | -8.83 | -2.58 | 9.41 | -18.83 | 1.146 | 1 | 0.2844 |
smooth (df = 3) | 4 | -6.89 | 3.39 | 9.45 | -18.89 | 0.066 | 1 | 0.7971 |
Change in log concentration
Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) | |
---|---|---|---|---|---|---|---|---|
overall | 1999 | 2015 | 4.299 | 4.308 | 0.00890 | 0.18943 | 0.047 | 0.9634 |
last 20 years | 1999 | 2015 | 4.299 | 4.308 | 0.00890 | 0.18943 | 0.047 | 0.9634 |
Status assessment
Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) | |
---|---|---|---|---|---|---|
BAC | 74.3 | 14.7 | -1.6217 | 0.1228 | -13.209 | 1.0000 |
EC | 74.3 | 500.0 | 1.9071 | 0.1228 | 15.533 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in biota
- Accessment criteria for metals in biota
Media : Biota (Blue mussel soft body)
Station : IrishSea_MorecambeBay_sh01, Roa Island (Morecambe Bay)
Determinand : Mercury
Units : μg kg-1 wet weight
Data extraction : 30 April 2020
Station : IrishSea_MorecambeBay_sh01, Roa Island (Morecambe Bay)
Determinand : Mercury
Units : μg kg-1 wet weight
Data extraction : 30 April 2020