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Table 2 Environmental variables included in the analyses

From: Italian reference rivers under the Water Framework Directive umbrella: do natural factors actually depict the observed nutrient conditions?

Category

Variable [unit]

Code

Notes

Water physicochemical

Oxygen saturation [%O2]

DO

Analytical methods [80]

Ammonia [mg l−1 NH4-N]

NNH4

Nitrate [mg l−1 NO3-N]

NNO3

Total phosphorous [mg l−1 P-tot]

TP

LIMeco (score)

LIMeco

[27] (Additional file 1: Table S2)

Climatic

Rain [mm]

Rain

Max, mean, min and standard dev (sd) 1950–2000 period—CCM2 database [28]

Air temperature [°C]

Temp

Geographical

Catchment area [km2]

Catch

From data provider or derived form QGIS

Site altitude [m a.s.l.]

Alt

Slope of the river [%]

River_Slope

Land use catchment

Land use artificial [%]

LU_art

[30, 31]

Land use agriculture low impact [%]

LU_agri_hi

Land use agriculture high impact [%]

LU_agri_low

Land use natural [%]

LU_nat

Land Use index [score]

LUIc

Atmospheric

deposition

Nin atmospheric deposition [mgN m−2y−1]

WetDEP_N

EMEP database [32]