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Combination Effect of Light and Toxicity in Algal Tests

Michael Cleuvers*,a, Rolf Altenburgerb and Hans Toni Rattec

a Department of General Biology, Aachen University of Technology, Kopernikusstraße 16, D-52056 Aachen, Germany
b Department of Chemical Ecotoxicology, UFZ Centre for Environmental Research, Permoserstraße 15, D-04318 Leipzig, Germany
c Aachen University of Technology, Worringerweg 1, D-52056 Aachen, Germany



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  		Fig. 1. Growth curves of Scenedesmus subspicatus as obtained for the test with five concentrations of potassium dichromate at a photon flux density of 120 µE s-1 m-2.

 


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  		Fig. 2. Concentration response curves of potassium dichromate at four selected light intensities (120, 72, 48, and 21 µE s-1 m-2). Shown are the inhibitions of the average growth rates, nonlinear regressions, four parameter logistic fit (for all fits: r2 = 0.999).

 


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  		Fig. 3. Concentration response curves of potassium dichromate at four selected light intenisties (120, 72, 48, and 21 µE s-1 m-2). Shown are the average growth rates, nonlinear regressions, four parameter logistic fit (for all fits: r2 = 0.999).

 




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