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Mixture toxicity of the antifouling compound irgarol to the marine phytoplankton species Dunaliella tertiolecta.
J Environ Sci Health B. 2006; 41(8):1349-60.JE

Abstract

This study examined the toxicity of irgarol, individually and in binary mixtures with three other pesticides (the fungicide chlorothalonil, and the herbicides atrazine and 2,4-D), to the marine phytoplankton species Dunaliella tertiolecta. Standard 96-h static algal bioassays were used to determine pesticide effects on population growth rate. Irgarol significantly inhibited D. tertiolecta growth rate at concentrations > or = 0.27 micro g/L. Irgarol was significantly more toxic to D. tertiolecta than the other pesticides tested (irgarol 96 h EC50 = 0.7 micro g/L; chlorothalonil 96 h EC50 = 64 micro g/L; atrazine 96 h EC50 = 69 micro g/L; 2,4-D 96 h EC50 = 45,000 micro g/L). Irgarol in mixture with chlorothalonil exhibited synergistic toxicity to D. tertiolecta, with the mixture being approximately 1.5 times more toxic than the individual compounds. Irgarol and atrazine, both triazine herbicides, were additive in mixture. The toxicity threshold of 2,4-D was much greater than typical environmental levels and would not be expected to influence irgarol toxicity. Based on these interactions, overlap of certain pesticide applications in the coastal zone may increase the toxicological risk to resident phytoplankton populations.

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Authors+Show Affiliations

DeLorenzo ME
US Department of Commerce/NOAA, National Ocean Service, Coastal Center for Environmental Health and Biomolecular Research, Charleston, SC 29412-9110, USA. marie.delorenzo@noaa.gov
Serrano L
No affiliation info available

MeSH

2,4-Dichlorophenoxyacetic AcidAnimalsAtrazineBiological AssayDose-Response Relationship, DrugDrug CombinationsDrug SynergismFungicides, IndustrialHerbicidesLethal Dose 50NitrilesPhytoplanktonPopulation DensityPopulation GrowthTriazinesWater Pollutants, Chemical

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17090497

Citation

DeLorenzo, Marie E., and Lorimar Serrano. "Mixture Toxicity of the Antifouling Compound Irgarol to the Marine Phytoplankton Species Dunaliella Tertiolecta." Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes, vol. 41, no. 8, 2006, pp. 1349-60.
DeLorenzo ME, Serrano L. Mixture toxicity of the antifouling compound irgarol to the marine phytoplankton species Dunaliella tertiolecta. J Environ Sci Health B. 2006;41(8):1349-60.
DeLorenzo, M. E., & Serrano, L. (2006). Mixture toxicity of the antifouling compound irgarol to the marine phytoplankton species Dunaliella tertiolecta. Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes, 41(8), 1349-60.
DeLorenzo ME, Serrano L. Mixture Toxicity of the Antifouling Compound Irgarol to the Marine Phytoplankton Species Dunaliella Tertiolecta. J Environ Sci Health B. 2006;41(8):1349-60. PubMed PMID: 17090497.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mixture toxicity of the antifouling compound irgarol to the marine phytoplankton species Dunaliella tertiolecta. AU - DeLorenzo,Marie E, AU - Serrano,Lorimar, PY - 2006/11/9/pubmed PY - 2007/1/17/medline PY - 2006/11/9/entrez SP - 1349 EP - 60 JF - Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes JO - J Environ Sci Health B VL - 41 IS - 8 N2 - This study examined the toxicity of irgarol, individually and in binary mixtures with three other pesticides (the fungicide chlorothalonil, and the herbicides atrazine and 2,4-D), to the marine phytoplankton species Dunaliella tertiolecta. Standard 96-h static algal bioassays were used to determine pesticide effects on population growth rate. Irgarol significantly inhibited D. tertiolecta growth rate at concentrations > or = 0.27 micro g/L. Irgarol was significantly more toxic to D. tertiolecta than the other pesticides tested (irgarol 96 h EC50 = 0.7 micro g/L; chlorothalonil 96 h EC50 = 64 micro g/L; atrazine 96 h EC50 = 69 micro g/L; 2,4-D 96 h EC50 = 45,000 micro g/L). Irgarol in mixture with chlorothalonil exhibited synergistic toxicity to D. tertiolecta, with the mixture being approximately 1.5 times more toxic than the individual compounds. Irgarol and atrazine, both triazine herbicides, were additive in mixture. The toxicity threshold of 2,4-D was much greater than typical environmental levels and would not be expected to influence irgarol toxicity. Based on these interactions, overlap of certain pesticide applications in the coastal zone may increase the toxicological risk to resident phytoplankton populations. SN - 0360-1234 UR - https://www.unboundmedicine.com/medline/citation/17090497/Mixture_toxicity_of_the_antifouling_compound_irgarol_to_the_marine_phytoplankton_species_Dunaliella_tertiolecta_ L2 - https://www.tandfonline.com/doi/full/10.1080/03601230600964100 DB - PRIME DP - Unbound Medicine ER -