Figure 1
Map of Serbia with an indication of the surveyed rivers. RČ – Rača; ST– Studenica; RŠ – Raška; RA – Rasina; ML – Mlava; RD – Radovanska Reka; VR – Vrla
Figure 2
Light microscopy (LM) micrographs. 1–10 N. moskalii; 11 N. cariocincta; 12, 13 N. oppugnata; 14–17 N. praeterita; 18 N. aquaedurae; 19 N. wiesneri; 20 N. germainii; 21 N. stankovicii; 22, 23 N. cataracta-rheni; 24 N. vandamii; 25 N. libonensis; 26, 27 N. associata; 28 N. subalpina; 29–35 N. cryptotenelloides. Scale bar = 10 μm
Table 1
List of Navicula species new to the diatom flora of Serbia
| Taxon | River | Figure |
|---|---|---|
| N. aquaedurae Lange-Bertalot | ML | Fig. 2. 18 |
| N. associata Lange-Bertalot | ML, RD | Fig. 2. 26, 27 |
| N. cariocincta Lange-Bertalot | ML | Fig. 3. 11 |
| N. cataracta-rheni Lange-Bertalot | VR | Fig. 2. 22, 23 |
| N. cryptotenelloides Lange-Bertalot | RA, RČ, ST, ML, RD, VR | Fig. 2. 29–35 |
| N. germainii J.H.Wallace | VR | Fig. 2. 20 |
| N. libonensis Schoeman | RA, RŠ | Fig. 2. 25 |
| N. moskalii Metzeltin, Witkowski & Lange-Bertalot | RA, RŠ, RČ, ST, ML, RD, | Fig. 2. 1–10, Fig. 5. 1–5 |
| N. oppugnata Hustedt | RA, RŠ, ML, RD | Fig. 2. 12, 13 |
| N. praeterita Hustedt | ST, ML | Fig. 2. 14–17 |
| N. splendicula VanLandingham | RA, RČ, ST, VR | Fig. 3. 1–17, Fig. 4. 1–6 |
| N. stankovicii Hustedt | RA | Fig. 2. 21 |
| N. subalpina Reichardt | RŠ, ML | Fig. 2. 28 |
| N. vandamii Schoeman & Archibald | ML | Fig. 2. 24 |
| N. wiesneri Lange-Bertalot | RA, RŠ, VR | Fig. 2. 19 |
[i] RČ – Rača; ST – Studenica; RŠ – Raška; RA – Rasina; ML – Mlava; RD – Radovanska Reka; VR – Vrla
Figure 3
Light microscopy (LM) micrographs. 1–17 N. splendicula. Scale bar = 10 μm
Figure 4
Scanning electron microscopy (SEM) micrographs of N. splendicula (1–6). 1–6 External valve view of the frustule; 6 Terminal raphe fissures; 2, 4 Center of raphe ends with the silicate tongue. Scale bar = 5 μm for 1, 3; 2 μm for 2, 4, 6; 10 μm for 5
Table 2
Mean values of physical and chemical parameters of water from seven rivers in Serbia
| Parameters | Unit | Rivers | ||||||
|---|---|---|---|---|---|---|---|---|
| Rasina | Rača | Studenica | Raška | Mlava | Vrla | Radovanska | ||
| T | °C | 2.5–18.7 | 5.7–17.3 | 1.4–19.1 | 9.9–13.5 | 6.4–16.8 | 2–15 | 6.4–15.4 |
| pH | 7.32–8.41 | 7.9–8.68 | 7.6–8.72 | 7.02–8.23 | 7.14–8.12 | 7.5–8.43 | 7.18–8.34 | |
| DO | mg l−1 | 9.2–14.4 | 9.5–12.5 | 9.2–16.4 | 7–12.6 | 7.5–12.2 | 8.8–15.1 | 7.5–12.8 |
| BOD | 1.3–8.8 | 2.2–7.5 | 2.45–9 | 2.05–8.3 | 1.4–7.8 | <0.2–6.7 | 1.25–7.2 | |
| N-NH4+ | 0.02–0.33 | 0.04–0.41 | 0.02–0.30 | 0.01–0.52 | 0.04–0.56 | 0.005–0.26 | 0.02–1.1 | |
| N-NO3− | 1.41–6.7 | 1.39–7.3 | 0.93–2.21 | 6.3–7.9 | 3.62–7.6 | 0.60–3.4 | 4.23–9 | |
| Con. | μS cm−1 | 120–345 | 247–384 | 146–257 | 305–423 | 340–506 | 58–115.6 | 278–540 |
| TP | μg P l−1 | 11–61.6 | 6.7–86.5 | 11.5–73 | 13.5–97.6 | 8.7–115.1 | 22.1–91 | 16–66.5 |
[i] T – Temperature, DO – Dissolved oxygen, TP – Total phosphorus, Con. – Conductivity
Figure 5
Scanning electron microscopy (SEM) micrographs of N. moskalii (1–5). Scale bar = 5 μm for 1, 3, 5; 2 μm for 2; 1 μm for 4
Checklist of the recorded Navicula taxa in Serbia (from the unpublished database of Serbian diatom flora compiled by Dr Jelena Krizmanić, University of Belgrade, Faculty of Biology)
| No. | Taxon |
|---|---|
| 1. | Navicula amphiceropsis Lange-Bertalot & U.Rumrich |
| 2. | Navicula angusta Grunow |
| 3. | Navicula antonii Lange-Bertalot |
| 4. | Navicula aquaedurae Lange-Bertalot |
| 5. | Navicula bourrellyivera Lange-Bertalot, Witkowski & Stachura |
| 6. | Navicula broetzii Lange-Bertalot & E.Reichardt |
| 7. | Navicula capitatoradiata H.Germain ex Gasse |
| 8 | Navicula cari Ehrenberg |
| 9. | Navicula catalanogermanica Lange-Bertalot & G.Hofmann |
| 10. | Navicula cincta (Ehrenberg) Ralfs |
| 11. | Navicula cryptocephala Kützing |
| 12. | Navicula cryptofallax Lange-Bertalot & G.Hofmann |
| 13. | Navicula cryptotenella Lange-Bertalot |
| 14. | Navicula dealpina Lange-Bertalot |
| 15. | Navicula digitoradiata (W.Gregory) Ralfs |
| 16. | Navicula erifuga Lange-Bertalot |
| 17. | Navicula exilis Kützing |
| 18. | Navicula exilissima Grunow |
| 19. | Navicula gregaria Donkin |
| 20. | Navicula jakovljevicii Hustedt |
| 21. | Navicula lanceolate Ehrenberg |
| 22. | Navicula lundii E.Reichardt |
| 23. | Navicula hasta Pantocsek |
| 24. | Navicula hintzii Lange-Bertalot |
| 25. | Navicula margalithii Lange-Bertalot |
| 26. | Navicula menisculus Schumann |
| 27. | Navicula microdigitoradiata Lange-Bertalot |
| 28. | Navicula novaesiberica Lange-Bertalot |
| 29. | Navicula oblonga (Kützing) Kützing |
| 30. | Navicula oligotraphenta Lange-Bertalot & G.Hofmann |
| 31. | Navicula peregrine (Ehrenberg) Kützing |
| 32. | Navicula perminuta Grunow |
| 33. | Navicula phyllepta Kützing |
| 34. | Navicula pseudolanceolata Lange-Bertalot |
| 35. | Navicula pseudosilicula Hustedt |
| 36. | Navicula pseudotenelloides Krasske |
| 37. | Navicula radiosa Kützing |
| 38. | Navicula recens (Lange-Bertalot) Lange-Bertalot |
| 39. | Navicula reinhardtii (Grunow) Grunow |
| 40. | Navicula reichardtiana Lange-Bertalot |
| 41. | Navicula rhynchotella Lange-Bertalot |
| 42. | Navicula rostellata Kützing |
| 43. | Navicula salinarum Grunow |
| 44. | Navicula salinarum var. rostrate (Hustedt) Lange-Bertalot |
| 45. | Navicula semen Ehrenberg |
| 46. | Navicula slesvicensis Grunow |
| 47. | Navicula subrhynchocephala Hustedt |
| 48. | Navicula symmetrica R.M.Patrick |
| 49. | Navicula staffordiae L.L.Bahls |
| 50. | Navicula streckerae Lange-Bertalot & Witkowski |
| 51. | Navicula rhynchocephala Kützing |
| 52. | Navicula tenelloides Hustedt |
| 53. | Navicula tripunctata (O.F.Müller) Bory |
| 54. | Navicula trivialis Lange-Bertalot |
| 55. | Navicula trophicatrix Lange-Bertalot |
| 56. | Navicula veneta Kützing |
| 57. | Navicula viridula (Kützing) Ehrenberg |
| 58. | Navicula viridulacalcis Lange-Bertalot |
| 59. | Navicula vulpine Kützing |
| 60. | Navicula upsaliensis (Grunow) M.Peragallo |
| 61. | Navicula wildii Lange-Bertalot |