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Contaminant data in biota used to construct the National Performance Framework Clean Seas Indicator 2015

The variables in biota_data.csv describe the contaminant data in biota used to construct the National Performance Framework Clean Seas Indicator 2015. The column headers are:

seriesID
Description: timeseries identifier
Unit:
Type: categorical
Levels: 1423
Note: identifies the data (typically a station / contaminant / species combination) that were grouped together into a timeseries and modelled to assess status and trends

station
Description: station identifier
Unit:
Type: categorical
Levels: 91
Note: monitoring station – links to station information in biota_stations.csv

species
Description: species
Unit:
Type: categorical
Levels: 5
Note:
Gadus morhua: AphiaID = 126436
Limanda limanda: AphiaID = 127139
Mytilus edulis: AphiaID = 140480
Platichthys flesus: AphiaID = 127141
Pleuronectes platessa: AphiaID = 127143

sex
Description: sex
Unit:
Type: categorical
Levels: F, I, M, X
Note: see ICES reference codes for SEXCO

year
Description: monitoring year
Unit:
Type: discrete
Range: 1999, 2014
Note: for some data suppliers, monitoring is in winter and e.g. sampling in December 2013 and January 2014 would be regarded as having come from the same monitoring year

date
Description: sampling date
Unit:
Type: discrete
Range: 1999-01-17, 2014-02-28
Note:

sampleID
Description: sample identifier
Unit:
Type: categorical
Levels: 1796
Note: data from different matrices (e.g. LI and MU) in the same fish have different sampleIDs

matrix
Description: sample matrix
Unit:
Type: categorical
Levels: LI, MU, SB
Note: see ICES reference codes for MATRX

group
Description: contaminant group
Unit:
Type: categorical
Levels: CB, metal, PAH.parent
Note:
CB = polychlorinated biphenyls
PAH.parent = parent polycyclic aromatic hydrocarbons

determinand
Description: contaminant
Unit:
Type: categorical
Levels: 19
Note: see ICES reference codes for PARAM; data submitted as CHRTR have been relabelled as CHR

metoa
Description: method of chemical analysis
Unit:
Type: categorical
Levels: 11
Note: see ICES reference codes for METOA

concentration
Description: concentration of contaminant
Unit: ug/kg ww
Type: continuous
Range: 0.01, 38900
Note: all contaminant concentrations are expressed on a wet weight basis

qflag
Description: less-than qualifier for the concentration measurement
Unit:
Type: categorical
Levels: "", "<"
Note:
“<” indicates a value below the limit of detection
"” indicates a value above the limit of detection

uncertainty
Description: uncertainty in the concentration measurement
Unit: as for concentration
Type: continuous
Range: 0.0025, 2647
Note: analytical uncertainty expressed as the standard deviation

LNMEA
Description: mean length
Unit: cm
Type: continuous
Range: 0.42, 305
Note: mean length of monitoring organism in pool; there are unit errors in these data, so the data should be used with caution

DRYWT
Description: dry weight of the sample
Unit: %
Type: continuous
Range: 6.83, 43.6
Note: all values are above the limit of detection

DRYWT.uncertainty
Description: uncertainty in the dry weight measurement
Unit: %
Type: continuous
Range: 0.66, 1.57
Note: analytical uncertainty expressed as the standard deviation

LIPIDWT
Description: lipid weight of the sample
Unit: %
Type: continuous
Range: 0.1, 56.2
Note: all values are above the limit of detection

LIPIDWT.uncertainty
Description: uncertainty in the lipid weight measurement
Unit: %
Type: continuous
Range: 0.016, 5.1
Note: analytical uncertainty expressed as the standard deviation

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