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Details van artikel 83 van 88 gevonden artikelen
| Titel: |
USE OF EXCLOSURES TO ASSESS THE IMPACT OF COPPER SULFATE TREATMENTS ON PHYTOPLANKTON |
| Auteur: |
Swain, Edward B. Monson, Bruce A. Pillsbury, Robert W. |
| Verschenen in: |
Lake and reservoir management |
| Paginering: | Jaargang 2 (1986) nr. 1 pagina's 303-308 |
| Jaar: |
1986 |
| Inhoud: |
The impact of a whole-lake copper sulfate treatment is difficult to assess because it is uncertain how the lake would have behaved if the copper had not been added, that is, no control exists. However, control can be created by isolating lake water in an enclosure prior to the copper sulfate treatment. The enclosure, by excluding copper, functions as an exclosure. By comparing the exclosure and the lake, the true impact of the copper treatment can be assessed. In this study, small (1 m diameter) polyethylene enclosures were used to study the effect of copper sulfate treatments of Halsteds Bay of Lake Minnetonka, Minn. Specific rates of photosynthesis were depressed in the lake only on the day of the copper treatment, after which rates exceeded the control for several weeks. In the period immediately after the copper treatment, green algae, diatoms, and nonnitrogen-fixing blue-greens were more common in the lake than in the control, but gradually nitrogen-fixing blue-green algae became dominant again. Therefore, the major effect of the copper sulfate treatment is a secondary succession of the pnytoplankton, analogous to the succession of terrestrial plants after a forest fire. In the lake studied, no residual copper toxicity to the phytoplankton was apparent after the first 24 hours. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 83 van 88 gevonden artikelen
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