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Combined and separate effects of cadmium, lead and zinc on ALA‐D activity, growth and hemoglobin content in daphnia magna
Author(s) -
Berglind Rune
Publication year - 1986
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620051107
Subject(s) - daphnia magna , zinc , cadmium , hemoglobin , chemistry , dehydratase , nuclear chemistry , toxicity , biochemistry , environmental chemistry , enzyme , organic chemistry
The single and combined effects of cadmium, lead and zinc on δ‐aminolevulinic acid dehydratase (ALA‐D) activity, growth and hemoglobin content were studied in Daphnia magna. The ALA‐D activity was enhanced by Cd and inhibited by Pb. The binary combinations, Pb:Cd and Pb:Zn, were powerful inhibitors of ALA‐D. However, in the combination of the highest concentrations of lead and zinc the activity of ALA‐D was enhanced. The stimulation by cadmium was abolished in the presence of zinc. All tertiary combinations of Pb, Cd and Zn inhibited ALA‐D activity. Lead alone did not decrease the hemoglobin content in D. magna even at 260 μg/L Pb, but in combination with zinc the decrease was abolished. Tertiary combinations of Cd, Pb and Zn were not more powerful in affecting the hemoglobin content than were the binary combinations. Growth was not affected by Cd, Pb or Zn in any of the combinations used.