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Photosynthetic and population growth response of the test alga Selenastrum capricornutum Printz to zinc, cadmium and suspended sediment elutriates

Published inJournal of applied phycology, vol. 10, no. 2, p. 145-151
Publication date1998
Abstract

Short-term ¹⁴C-fixation (4 h) Selenastrum capricornutum algal toxicity tests were conducted with Cd (n=8), Zn (n=9) and suspended sediment aqueous elutriates (n=28) and the results were compared to those obtained in a 48 h population growth test. In order to provide more realistic experimental conditions, toxicity tests were carried out in prefiltered nutrient-spiked Lake Geneva water. The population growth inhibition test was significantly more sensitive than the ¹⁴C-fixation test for Cd (median EC50-4h and EC50-48h values of 600 and 118 µg L⁻¹, respectively) whereas no significant difference was measured for Zn toxicity (median EC50-4h and EC50-48h values of 97 and 96 µg L⁻¹, respectively). With suspended sediment aqueous elutriates, the relative sensitivity of the two different end points is sample dependent, with ratios of the EC25 for the ¹⁴C-fixation: population growth test ranging from <0.26 to >53.3. Elutriate toxicity shows no apparent relationship between the acute and chronic test, indicating that population growth inhibition cannot be derived directly or predicted from ¹⁴C-fixation. Both tests with their specific advantages and limitations provide valuable complementary information to measure the impact of single toxicants or complex mixtures on aquatic plants.

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Keywords
  • ¹⁴C
  • Photosynthesis
  • Population growth
  • Selenastrum capricornutum
  • Suspended sediment elutriate
  • Zinc
  • Cadmium
Citation (ISO format)
PARDOS, Michel, BENNINGHOFF, Christophe, THOMAS, Richard Lynn. Photosynthetic and population growth response of the test alga Selenastrum capricornutum Printz to zinc, cadmium and suspended sediment elutriates. In: Journal of applied phycology, 1998, vol. 10, n° 2, p. 145–151. doi: 10.1023/A:1008043931094
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ISSN of the journal0921-8971
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