| Water category: | Lake |
| Pressure categories | Nutrients |
| Pressure detail | Commonly termed eutrophication. Usually caused by increase in phosphorus loading. |
| Specific Index | Proportion of pennate diatoms (esp. Asterionella, Diatoma, Fragilaria, Tabellaria) on phytoplankton biovolume. |
| Brief text description | Proportion of pennales shows a positive relationship with eutrophication, which is different from the response of cyanobacteria in that pennate diatoms respond at lower pressure levels. |
| Long text description | Pennate diatoms are fast-growing large algae. They may turn dissolved mineral nutrients fast into biomass. |
| History of development | Relationship known form Scandinavian lakes (P. Brettum) |
| References | Brettum, P. (1979) Norwegian istitute for water research (NIVA) report. XB-07. 102 pp. R Ptacnik et al. (2007) Aquat. Ecol.(in rev.) |
| Geographic region (GIG) - L | LNO - Northern |
| Ecoregion - LR | 22. Fenno-Scandian shield |
| Country | FIN Finland S Sweden NO Norway |
| Geographical location of source data | Multi-national |
| Reference conditions | Considered |
| Development | Rebecca |
| Uncertainty | Considered |
| Link to document store | Yes |
| BMW Toolbox | No |
| Entry status | Unvalidated |
| Attachment 1 | Proportion pennales [16001 bytes] |