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Effects of Cd & Ni toxicity to Ceratophyllum demersum under environmentally relevant conditions in soft & hard water including a German lake

Effects of Cd & Ni toxicity to Ceratophyllum demersum under environmentally relevant conditions in soft & hard water including a German lake

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ANDRESEN, Elisa, Daniela OPITZ, George THOMAS, Hans-Joachim STÄRK, Holger DIENEMANN, Kerstin JENEMANN, Bryan C. DICKINSON, Hendrik KÜPPER, 2013. Effects of Cd & Ni toxicity to Ceratophyllum demersum under environmentally relevant conditions in soft & hard water including a German lake. In: Aquatic Toxicology. 142-143, pp. 387-402. ISSN 0166-445X. eISSN 1879-1514

@article{Andresen2013-10-15Effec-24903, title={Effects of Cd & Ni toxicity to Ceratophyllum demersum under environmentally relevant conditions in soft & hard water including a German lake}, year={2013}, doi={10.1016/j.aquatox.2013.09.016}, volume={142-143}, issn={0166-445X}, journal={Aquatic Toxicology}, pages={387--402}, author={Andresen, Elisa and Opitz, Daniela and Thomas, George and Stärk, Hans-Joachim and Dienemann, Holger and Jenemann, Kerstin and Dickinson, Bryan C. and Küpper, Hendrik} }

Dienemann, Holger Dickinson, Bryan C. Dickinson, Bryan C. Jenemann, Kerstin Thomas, George deposit-license Küpper, Hendrik Opitz, Daniela Even essential trace elements are phytotoxic over a certain threshold. In this study, we investigated whether heavy metal concentrations were responsible for the nearly complete lack of submerged macrophytes in an oligotrophic lake in Germany. We cultivated the rootless aquatic model plant Ceratophyllum demersum under environmentally relevant conditions like sinusoidal light and temperature cycles and a low plant biomass to water volume ratio. Experiments lasted for six weeks and were analysed by detailed measurements of photosynthetic biophysics, pigment content and hydrogen peroxide production. We established that individually non-toxic cadmium (3 nM) and slightly toxic nickel (300 nM) concentrations became highly toxic when applied together in soft water, severely inhibiting photosynthetic light reactions. Toxicity was further enhanced by phosphate limitation (75 nM) in soft water as present in many freshwater habitats. In the investigated lake, however, high water hardness limited the toxicity of these metal concentrations, thus the inhibition of macrophytic growth in the lake must have additional reasons. The results showed that synergistic heavy metal toxicity may change ecosystems in many more cases than estimated so far. Jenemann, Kerstin 2013-10-22T09:17:51Z Thomas, George Opitz, Daniela eng Andresen, Elisa 2013-10-22T09:17:51Z Stärk, Hans-Joachim Stärk, Hans-Joachim Küpper, Hendrik 2013-10-15 Dienemann, Holger Aquatic Toxicology ; 142-143 (2013). - S. 387–402 Effects of Cd & Ni toxicity to Ceratophyllum demersum under environmentally relevant conditions in soft & hard water including a German lake Andresen, Elisa

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