Genus: Closterium
| Year | Arter/grupper | Localities | Participants | Observations |
|---|---|---|---|---|
| 2005 | 1 | 1 | 1 | 1 |
| 1996 | 1 | 1 | 1 | 1 |
| 1994 | 2 | 6 | 6 | 6 |
| 1993 | 4 | 7 | 7 | 8 |
| 1992 | 1 | 1 | 1 | 1 |
| 1991 | 4 | 9 | 9 | 10 |
| 1990 | 10 | 18 | 18 | 38 |
| 1989 | 3 | 16 | 16 | 16 |
| Totalt alle år | 13 | 44 | 43 | 81 |
Sustain.no is provided by the Norwegian Centre for Science Education
Responsible editor: Doris Jorde