TITLE

Effect of atrazine on growth, photosynthesis, and between-strain variability in Scenedesmus subspicatus (Chlorophyceae)

AUTHOR(S)
Joseph, A. L.; Genoni, G. P.; Behra, R.
PUB. DATE
July 1999
SOURCE
Archives of Environmental Contamination & Toxicology;Jul1999, Vol. 37 Issue 1, p36
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The magnitude of between-strain differences in the sensitivity of algal species to toxicants is not well known. Yet, informations obtained with a single strain are used for ecotoxicological assessment and for interspecific comparisons. Using 12 strains, we determined whetherintraspecific variability occurs in the green alga Scenedesmus subspicatus. We examined growth, photosynthetic activity, and short-term sensitivity thereof to the herbicide atrazine (500 mu g - L-1) as well as how these responses are affected by chronic exposure to low atrazine concentrations (0, 1, 5, and 20 nu g - L-1). Independent of chronic exposure to atrazine, the strains differed in growth rate and photosynthesis rate. Yet the short-term sensitivityto atrazine was affected by the chronic treatments. All but one strain became more tolerant, their short-term sensitivity being inverselyrelated to the applied atrazine concentration and dependent on the duration of exposure. Differences in response to increments in atrazine concentration resulted in differences in rank order of sensitivity of strains. Moreover, between-strain variability was markedly higher in the atrazine treatments than in the controls. These results can beexplained by the significant role of genotype versus environment interactions in determining intraspecific differences in adaptive physiological responses of S. subspicatus to chronic exposure to atrazine.
ACCESSION #
8382842

 

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