| NRCS | Navicula recens (Lange-Bertalot) Lange-Bertalot | 0.0 | 0.0 | 0.0 | 0.0 | 3.7 | 0.0 | 0.9 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| NRCH | Navicula reichardtiana Lange-Bertalot in Krammer & Lange-Bertalot | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| NTPT | Navicula tripunctata (O. F. Müller) Bory | 0.0 | 0.6 | 1.2 | 1.8 | 3.6 | 5.6 | 0.5 | 2.5 | 0.9 | 0.0 | 0.4 | 0.3 | 1.1 | 2.3 | 0.6 | 3.7 | 0.9 |
| NVEN | Navicula veneta Kützing | 0.0 | 0.0 | 0.3 | 0.0 | 1.5 | 0.0 | 2.8 | 0.5 | 1.2 | 0.0 | 0.2 | 0.0 | 0.1 | 0.5 | 0.3 | 0.8 | 1.2 |
| NAMP | Nitzschia amphibia Grunow | 4.1 | 0.9 | 2.9 | 3.2 | 5.0 | 3.9 | 2.6 | 0.7 | 2.6 | 1.1 | 1.9 | 5.9 | 3.4 | 3.7 | 1.5 | 1.2 | 1.9 |
| NCPL | Nitzschia capitellata Hustedt in A. Schmidt & al. | 0.3 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.3 | 1.2 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 |
| NCOT | Nitzschia constricta (Kützing) Ralfs in Pritchard | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 0.1 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.3 | 0.0 | 0.0 | 0.0 |
| NDEN | Nitzschia denticula Grunow in Cleve & Grunow | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 |
| NDIS | Nitzschia dissipata (Kützing) Grunow | 0.3 | 2.5 | 3.3 | 1.7 | 3.8 | 0.4 | 3.4 | 1.1 | 0.3 | 1.2 | 0.4 | 0.1 | 0.9 | 2.3 | 2.4 | 0.3 | 0.2 |
| NFIL | Nitzschia filiformis (W. Smith) Hustedt | 0.0 | 0.2 | 0.1 | 0.4 | 1.0 | 0.7 | 0.3 | 0.7 | 0.0 | 0.0 | 0.4 | 0.0 | 0.4 | 0.2 | 0.0 | 0.3 | 0.0 |
| NIFR | Nitzschia frustulum (Kützing) Grunow | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 6.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| NHEU | Nitzschia heufleriana Grunow | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| NINC | Nitzschia inconspicua Grunow | 12.2 | 1.0 | 6.1 | 14.6 | 12.4 | 0.1 | 5.7 | 11.1 | 4.5 | 18.6 | 23.5 | 5.6 | 7.3 | 10.5 | 5.2 | 1.7 | 4.4 |
| NMIC | Nitzschia microcephala Grunow in Cleve & Moller | 0.0 | 0.0 | 0.0 | 0.3 | 0.1 | 0.0 | 1.6 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| NPAL | Nitzschia palea (Kützing) W. Smith | 4.0 | 2.2 | 3.2 | 0.6 | 1.0 | 0.6 | 1.7 | 0.5 | 0.2 | 4.5 | 8.5 | 0.0 | 0.1 | 0.5 | 0.3 | 1.1 | 1.5 |
| NREC | Nitzschia recta Hantzsch in Rabenhorst | 0.0 | 0.1 | 0.2 | 0.0 | 0.1 | 0.2 | 0.0 | 0.2 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 0.0 |
| PLFR | Planothidium frequentissimum (Lange-Bertalot) Lange-Bertalot | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 0.4 | 0.5 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 1.9 | 0.0 | 0.3 | 1.5 |
| PTLA | Planothidium lanceolatum (Brebisson ex Kützing) Lange-Bertalot | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| PTRO | Planothidium rostratum (Østrup) Round & Bukhtiyarova | 0.0 | 0.1 | 0.1 | 0.1 | 0.9 | 0.2 | 0.0 | 0.1 | 0.1 | 0.3 | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.2 |
| PLEV | Pleurosira laevis (Ehrenberg) Compère | 0.0 | 1.0 | 0.4 | 0.1 | 0.4 | 0.7 | 1.3 | 0.5 | 1.0 | 0.3 | 0.1 | 0.3 | 0.5 | 1.1 | 0.0 | 3.3 | 1.2 |
| PSBR | Pseudostaurosira brevistriata (Grunow) D. M. Williams & Round | 0.0 | 0.6 | 0.3 | 0.4 | 0.4 | 0.1 | 0.3 | 0.4 | 0.0 | 0.1 | 0.2 | 0.1 | 0.0 | 0.2 | 0.1 | 0.3 | 0.0 |
| RUNI | Reimeria uniseriata Sala, Guerrero & Ferrario | 2.4 | 0.4 | 1.2 | 2.3 | 1.5 | 1.3 | 5.3 | 13.5 | 1.1 | 0.3 | 0.1 | 0.8 | 0.1 | 0.1 | 1.7 | 0.2 | 0.2 |
| RABB | Rhoicosphenia abbreviata (C. Agardh) Lange-Bertalot | 0.3 | 2.5 | 2.1 | 1.2 | 2.4 | 4.4 | 3.0 | 1.8 | 1.9 | 0.7 | 10.4 | 5.4 | 2.0 | 5.8 | 1.8 | 5.8 | 3.3 |
| SCVE | Staurosira construens var. venter (Ehrenberg) P.B. Hamilton | 0.3 | 0.4 | 0.1 | 2.3 | 0.3 | 0.0 | 0.6 | 0.1 | 0.3 | 0.7 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.3 | 0.7 |
| SBRE | Surirella brebissonii Krammer & Lange-Bertalot | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| THLA | Thalassiosira lacustris (Grunow) Hasle in Hasle & Fryxell | 0.1 | 0.4 | 0.2 | 0.2 | 0.4 | 0.5 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 0.3 | 0.1 | 0.0 | 0.0 |
| UULN | Ulnaria ulna (Nitzsch) Compère | 0.7 | 1.6 | 1.2 | 0.3 | 0.1 | 0.3 | 0.6 | 0.5 | 0.2 | 0.3 | 0.4 | 0.2 | 0.3 | 0.6 | 0.1 | 0.5 | 0.5 |