| Autor: |
Nicholls, K. H., Hopkins, G. J. |
| Přispěvatelé: |
Aquatic Science Section, Ontario Ministry of Environment and Energy |
| Jazyk: |
angličtina |
| Rok vydání: |
1994 |
| Předmět: |
|
| Popis: |
Analyses of phytoplankton samples collected weekly and year-round at municipal water supply intakes in Lake Erie have shown a response to long-term changes in phosphorus loading and the more recent invasion of zebra mussels. Total phytoplankton densities in the western basin of Lake Erie declined from about 5000 Areal Standard Units (A.S.U.)/mL during the late 1960s to less than 1000 A.S.U./mL by the mid-1980s and coincided with declines in total phosphorus inputs to the western basin of about 50%. Similar declines were not observed at sites in the central and eastern basins; however, a further dramatic decline (>90%) at all four Lake Erie sites during 1988-1990 coincided with the invasion of the lake by zebra mussels (Dreissena polymorpha). Similar declines in phytoplankton were not observed at reference sites in southern Lake Huron, where zebra mussels were not abundant. In the western basin, chlorophyll a concentrations of |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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