Figure 1
Figure 2
Figure 3
Characteristics of the studied watercourses in Bieszczady and Magura National Park
| Rivers and streams | Number of sites | Watercourse length (km) | Short description |
|---|---|---|---|
| Bieszczady National Park | |||
| Wołosaty | 6 | 27.8 | right-bank tributary of the San River in the upper section called Wołosatka |
| Terebowiec | 2 | 8 | right-bank tributary of the Wołosaty |
| Rzeczyca | 1 | 13.2 | left-bank tributary of the Wołosaty |
| Magura National Park | |||
| Wisłoka | 6 | 164 | right-bank tributary of the Vistula |
| Wisłoka’s tributary | 1 | 0.9 | nameless, short right-bank tributary of the Wisłoka, drying during summer |
| Kłopotnica | 3 | 15 | left-bank tributary of the Wisłoka |
| Świerzówka | 1 | 8.3 | left-bank tributary of the Wisłoka |
| Rzeszówka | 1 | 8.2 | left-bank tributary of the Wisłoka |
| Ryjak | 3 | 12 | right-bank tributary of the Wisłoka |
| Ryjak’s tributary | 1 | 1.2 | nameless, short left-bank tributary of the Ryjak, |
| Krempna | 2 | 7.3 | right-bank tributary of the Wisłoka |
| Baranie | 2 | 5.8 | left-bank tributary of the Wilsznia |
| Zimna Woda | 2 | 4.8 | left-bank tributary of the Hucianka |
| Zimna Woda’s tributary | 1 | 0.8 | nameless, short right-bank tributary of the Zimna Woda |
| Wilsznia | 3 | 11.5 | right-bank tributary of the Wisłoka |
Description of the sampling sites and valve dimensions of L_ frequentissima
| Sampling site | Bieszczady National Park | Magura National Park | ||||
|---|---|---|---|---|---|---|
| Wołosaty | Terebowiec | Ryjak’s tributary | Wisłoka | Wisłoka’s tributary | soil (Ryjak, Wilsznia catchments) | |
| Date | 03/2014 | 03/2014 | 07/2013 | 10/2013 | 04/2013 | 04/2014 |
| Insolation | high | low | low | high | low | high |
| Type of substrate | stones (large ones covered with moss) | stones | stones (near shore covered with mud) | stones | stones (large ones covered with moss) | soil overgrown with grass in ca. 50% |
| Temperature (°C) | 5.6 | 6.1 | 13.4 | 10.2-11.7 | 8.1-11.8 | - |
| pH | 8.5 | 8.4 | 8.1 | 6.3-6.5 | 7.3-7.4 | 5.6-6.5 |
| Conductivity (μS cm–1) | 166 | 138 | 288 | 378-402 | 174-341 | - |
| NO3- (mg l-1) | 0.22 | 0.23 | 0.84 | <0.01 | 1.91-5.76 | - |
| SO42- (mg l-1) | 16.37 | 13.74 | 18.78 | 20.39-26.53 | 18.20-21.26 | - |
| L. frequentissima valve dimensions | ||||||
| Length (μm) | 9.4 | 14.1 | 8-13.3 | 11.6-16.5 | 6.2-22.5 | 8.6-16.6 |
| Breadth (μm) | 5.0 | 6.6 | 5.5-6.2 | 4.0-6.0 | 4.4-7.6 | 5.1-6.4 |
| Striae per 10 μm | 22 | 21 | 23-27 | 22 | 18-21 | 22-27 |