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Schauerte, W. ; Lay, J.P. ; Klein, W. ; Korte, F.

Influence of 2,4,6-trichlorophenol and pentachlorophenol on the biota of aquatic systems. Outdoor experiments in compartments of a natural pond.

Chemosphere 11, 71-79 (1982)

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Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.

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Effects of the chemicals 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) on population dynamics of several species were studied in a short-term experiment in separated compartments of an experimental pond. TCP and PCP were applied at single doses of 5 mg/1 and 1 mg/1 respectively in duplicates into compartments of a natural experimental pond. The chemicals showed the following influences on population dynamics and on the physicochemistry of the compartments: 1. 1. A rapid decline of daphnia concentrations to zero after about three days for PCP and eight days for TCP. 2. 2. A decrease of autotrophic phytoplankton (blue-algae and diatoms). 3. 3. A continuous increase of contamination indicators like flagellates and microorganisms. 4. 4. A significant decrease in oxygen concentration as secondary effect of the changed balance between autotrophic and heterotrophic populations.

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