| Water category: | Lake |
| Pressure categories | Nutrients |
| Pressure detail | Commonly termed eutrophication. Usually caused by increase in phosphorus loading. |
| Specific Index | Proportion of chrysophyte algae (exc. Uroglena & Synura) on phytoplankton biovolume. |
| Brief text description | Proportion of chysophyte algae is inversely related to eutrophication. |
| Long text description | Chrysophyte algae comprise mainly mixotrophic algae, which are capable of obtaining nutrients by ingestion of other small algae and bacteria. They are therefore superior under limitaion of dissolved mineral nutrients (the only source of nutrients for non-mixotrophic algae). Such conditions are especially given in (ultra-) oligotrophic waters. NB! The relationship is well established across Scandinavia, but is much weaker further south. Climatic factors are likely to play an important role. |
| History of development | Known for long time. First time quantified for Fennoscandian lakes in REBECCA project. |
| References | SB Watson et al. (1997) Limnol. Oceanogr. 42(3) 487-495 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 of chrysophyte algae [18176 bytes] |