Abstract
The influence of industrial tailings on the biological integrity of the phytoplankton was assessed from annual measurements of photosynthetic rates in the alpine lake Traunsee. The mean annual integral production of 21 mmol C m-2 d-1 corresponded to the oligotrophic nature of the lake. Effects of effluents were tested by comparing photosynthesis at a station close to the industrial outlet (EB) and at a reference site with a maximum depth of 190 m (VI). Between-site optical properties (vertical attenuation coefficient, euphotic depth) were statistically significant different. The euphotic zone at the impacted station was on average 2 m shallower than at the reference site, owing to turbidity emanating from the industrial plant. The adaptation to low light intensities by the algal community at this station was evident from a high maximum light utilisation coefficient (α* at low light saturation (E K). Algae at the deep reference site were photosynthetically less efficient but adapted to high light intensities. Photosynthetic adaptation to different light climates in the euphotic zone without significant quantitative biomass alterations at the impacted site gave a clear signature of biological integrity of the phytoplankton in the oligotrophic Traunsee.
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Teubner, K., Dokulil, M.T. 14C-Photosynthesis of Phytoplankton in an Oligotrophic Alpine Lake (Traunsee, Austria) and its Response to Turbidity Caused by Industrial Tailings. Water, Air, & Soil Pollution: Focus 2, 181–190 (2002). https://doi.org/10.1023/A:1020368327579
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DOI: https://doi.org/10.1023/A:1020368327579