Table 1

Sampling site characteristics.

River Site Latitude (°N) Longitude (°E) Elevation (m a.s.l.) Discharge (m3 s−1) River width (m) Water depth (cm) No. of sampling events Water temperature (°C)

Spring Summer Autumn Winter
Vistula Łęka 50.2827 20.8498 168 230.0 181 45–65 7 16.1 21.5 7.8 5.1
Nida Stara Rudawa 50.4131 20.5792 174 22.0 28 30–80 8 12.5 19.2 7.8 5.9
Czarna Nida Gaj 50.7572 20.5052 211 6.5 15 30–95 8 11.3 21.4 4.8 4.2

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