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Table 2 Environmental variables used in data analysis with units and explanation

From: Relationship between agricultural pesticides and the diet of riparian spiders in the field

VariableUnit and explanationLoading on SPCA axesValue
MeanSD
ToxicityMaximum of log sum toxic unit for the most sensitive freshwater invertebrateExcluded from SPCA− 0.560.52
pHb First axis; 0.338.190.18
Oxygenb[%] dissolved oxygen in the streamFirst axis; 0.4575.998.95
Field distance indexWeighted distance of streams to agriculturally used fields for right and left site of the stream, at sampling siteFirst axis; − 0.130.640.25
Corridor land use meadows[%] land cover with meadows within a 200 m distance to the streamFirst axis; − 0.1452.525.78
Catchment size[km2] size of catchment areaFirst axis; 0.3076.0367.16
Catchment land use type 1[%] land cover with arable land and permanent crops in the catchmentcFirst axis; − 0.3130.3413.92
Maximal width stream[m] widest part of the stream at sampling siteFirst axis; 0.393.571.35
Minimal width stream[m] narrowest part of the stream at sampling siteFirst axis; 0.422.281.23
Riffles[%]First axis; 0.3641.9228.03
Sulphatea[mg/L]Second axis; 0.3664.5433.38
Riparian cover shrubs[%] riparian land covered with shrubs within 5 m to stream along a 20 m transectSecond axis; 0.6216.1515.93
Riparian cover meadows[%] riparian land covered with meadows within 5 m to stream along a 20 m transectSecond axis; − 0.5925.3825.02
Catchment land use type 2[%] pastures and heterogenous agricultural areas in the catchmentcSecond axis; − 0.3739.077.54
  1. SD standard deviation
  2. aCompact-photometer PF-12, Macherey-Nagel was used for measurement
  3. bMultiparameter pH/ORP/EC/TDS/salinity/DO/pressure/temperature waterproof meter—HI98194, Hanna Instruments was used for measurement
  4. cCORINE codes from catchment land use 1: non-irrigated arable land 211, vineyards 221, fruit trees and berry plantations 222; CORINE codes from catchment land use 2: pastures 231, complex cultivation patterns 242, land occupied by agriculture with significant areas of natural vegetation and pastures in the catchment area 243 [28]