Tags

Type your tag names separated by a space and hit enter

Temperature-dependent sensitivity of growth and photosynthesis of Scenedesmus obliquus, Navicula pelliculosa and two strains of Microcystis aeruginosa to the herbicide atrazine.
Aquat Toxicol. 2011 May; 103(1-2):9-17.AT

Abstract

The temperature-dependent sensitivities of two algal species and two strains of cyanobacteria to the photosynthesis-inhibiting herbicide atrazine were evaluated in order to understand how the interaction between acclimation temperature and herbicide will affect growth and photosynthesis of aquatic microorganisms. The green alga Scenedesmus obliquus, the diatom Navicula pelliculosa and a toxic and non-toxic strain of Microcystis aeruginosa were acclimated to three different temperatures (10, 15 and 25°C) and exposed to five concentrations of the herbicide atrazine (0-0.15μM) for 72h. Growth, photosynthetic yields, energy fluxes within photosystem II and pigment content were then measured as potential responses to each treatment. With the exception of N. pelliculosa, the toxicity of atrazine was higher when microorganisms were acclimated to lower temperatures. N. pelliculosa was not only the most tolerant to atrazine, but also had a similar sensitivity to this herbicide at every temperature. The observed differences in growth sensitivity to atrazine at low temperature are associated with the ability of algae and cyanobacteria to cope with high excitation pressure, by increasing its protective carotenoid content and non-photochemical energy dissipation. Our results demonstrate that future guidelines for the protection of aquatic life should consider water temperature as an important factor influencing the toxicity of atrazine to aquatic microorganisms.

Links

Publisher Full Text

Authors+Show Affiliations

Chalifour A
Department of Biological Sciences-TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Université du Québec à Montréal, Succ. Centre-Ville, Montreal, Quebec, Canada.
Juneau P
No affiliation info available

MeSH

AtrazineDiatomsFresh WaterHerbicidesMicrocystisPhotosystem II Protein ComplexScenedesmusTemperatureWater Pollutants, Chemical

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21392491

Citation

Chalifour, Annie, and Philippe Juneau. "Temperature-dependent Sensitivity of Growth and Photosynthesis of Scenedesmus Obliquus, Navicula Pelliculosa and Two Strains of Microcystis Aeruginosa to the Herbicide Atrazine." Aquatic Toxicology (Amsterdam, Netherlands), vol. 103, no. 1-2, 2011, pp. 9-17.
Chalifour A, Juneau P. Temperature-dependent sensitivity of growth and photosynthesis of Scenedesmus obliquus, Navicula pelliculosa and two strains of Microcystis aeruginosa to the herbicide atrazine. Aquat Toxicol. 2011;103(1-2):9-17.
Chalifour, A., & Juneau, P. (2011). Temperature-dependent sensitivity of growth and photosynthesis of Scenedesmus obliquus, Navicula pelliculosa and two strains of Microcystis aeruginosa to the herbicide atrazine. Aquatic Toxicology (Amsterdam, Netherlands), 103(1-2), 9-17. https://doi.org/10.1016/j.aquatox.2011.01.016
Chalifour A, Juneau P. Temperature-dependent Sensitivity of Growth and Photosynthesis of Scenedesmus Obliquus, Navicula Pelliculosa and Two Strains of Microcystis Aeruginosa to the Herbicide Atrazine. Aquat Toxicol. 2011;103(1-2):9-17. PubMed PMID: 21392491.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Temperature-dependent sensitivity of growth and photosynthesis of Scenedesmus obliquus, Navicula pelliculosa and two strains of Microcystis aeruginosa to the herbicide atrazine. AU - Chalifour,Annie, AU - Juneau,Philippe, Y1 - 2011/02/02/ PY - 2010/10/20/received PY - 2011/01/25/revised PY - 2011/01/27/accepted PY - 2011/3/12/entrez PY - 2011/3/12/pubmed PY - 2011/6/23/medline SP - 9 EP - 17 JF - Aquatic toxicology (Amsterdam, Netherlands) JO - Aquat Toxicol VL - 103 IS - 1-2 N2 - The temperature-dependent sensitivities of two algal species and two strains of cyanobacteria to the photosynthesis-inhibiting herbicide atrazine were evaluated in order to understand how the interaction between acclimation temperature and herbicide will affect growth and photosynthesis of aquatic microorganisms. The green alga Scenedesmus obliquus, the diatom Navicula pelliculosa and a toxic and non-toxic strain of Microcystis aeruginosa were acclimated to three different temperatures (10, 15 and 25°C) and exposed to five concentrations of the herbicide atrazine (0-0.15μM) for 72h. Growth, photosynthetic yields, energy fluxes within photosystem II and pigment content were then measured as potential responses to each treatment. With the exception of N. pelliculosa, the toxicity of atrazine was higher when microorganisms were acclimated to lower temperatures. N. pelliculosa was not only the most tolerant to atrazine, but also had a similar sensitivity to this herbicide at every temperature. The observed differences in growth sensitivity to atrazine at low temperature are associated with the ability of algae and cyanobacteria to cope with high excitation pressure, by increasing its protective carotenoid content and non-photochemical energy dissipation. Our results demonstrate that future guidelines for the protection of aquatic life should consider water temperature as an important factor influencing the toxicity of atrazine to aquatic microorganisms. SN - 1879-1514 UR - https://www.unboundmedicine.com/medline/citation/21392491/Temperature_dependent_sensitivity_of_growth_and_photosynthesis_of_Scenedesmus_obliquus_Navicula_pelliculosa_and_two_strains_of_Microcystis_aeruginosa_to_the_herbicide_atrazine_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0166-445X(11)00023-3 DB - PRIME DP - Unbound Medicine ER -