Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach
Glyphosate (G) and 2,4-D herbicides are massively applied in agriculture worldwide and the use of their mixture is currently a very common practice. We carried out two experiments using microcosms under laboratory conditions for 7 days each. In the first experiment, we analyzed changes in species co...
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todo:paper_01476513_v148_n_p1010_Lozano2023-10-03T15:00:40Z Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach Lozano, V.L. Vinocur, A. Sabio y García, C.A. Allende, L. Cristos, D.S. Rojas, D. Wolansky, M. Pizarro, H. 2,4-D Freshwater Glyphosate Mixture Periphyton Phytoplankton 2,4 dichlorophenoxyacetic acid chlorophyll a glyphosate community dynamics glyphosate herbicide microbial community microcosm periphyton phytoplankton alga Article autotrophy concentration (parameters) controlled study dry weight ecotoxicity microbial community microcosm nonhuman periphyton physical resistance phytoplankton population abundance species composition Staurastrum turbidity algae Leptolyngbya sp. Staurastrum Glyphosate (G) and 2,4-D herbicides are massively applied in agriculture worldwide and the use of their mixture is currently a very common practice. We carried out two experiments using microcosms under laboratory conditions for 7 days each. In the first experiment, we analyzed changes in species composition, abundance and chlorophyll a of phytoplankton due to 10 treatments: control; low, medium and high concentrations of G and 2,4-D; and mixtures at low, medium and high concentrations at a G:2,4-D ratio of 1:0.45. In the second experiment we studied changes on the composition of the autotrophic fraction and abundance, chlorophyll a, dry weight (DW), ash free dry weight (AFDW) and autotrophic index of periphyton developed in artificial substrata under 7 treatments considering the lowest doses that showed an effect in the previous phytoplankton experiment: control; pure G and Glifosato Atanor® (glyphosate-based formulation); pure 2,4-D and Asi Max 50® (2,4-D-based formulation); mixtures of the a.i at a G:2,4-D ratio of 1:0.45, and mixture of Glifosato Atanor® + Asi Max®. Results showed that G was more toxic than 2,4-D to the algal fraction, decreasing chlorophyll a, turbidity and algal abundances in the phytoplankton experiment. The effects of the mixture on phytoplankton were mainly additive, except for total and Staurastrum sp. live abundances where an antagonistic effect between herbicides was recorded. Periphyton showed more resistance to the herbicides as it was less affected than phytoplankton by the active ingredients and commercial formulations. The high development of Leptolyngbya sp. due to the impact of the herbicide mixture on periphyton might represent the beginning of a more conspicuous community to prevent the impact of contaminants. The study of the impacts of herbicide mixtures on freshwater systems requires the analysis of several variables to better assess the responses of key microbial communities and to predict more realistic scenarios. © 2017 Elsevier Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01476513_v148_n_p1010_Lozano |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
2,4-D Freshwater Glyphosate Mixture Periphyton Phytoplankton 2,4 dichlorophenoxyacetic acid chlorophyll a glyphosate community dynamics glyphosate herbicide microbial community microcosm periphyton phytoplankton alga Article autotrophy concentration (parameters) controlled study dry weight ecotoxicity microbial community microcosm nonhuman periphyton physical resistance phytoplankton population abundance species composition Staurastrum turbidity algae Leptolyngbya sp. Staurastrum |
| spellingShingle |
2,4-D Freshwater Glyphosate Mixture Periphyton Phytoplankton 2,4 dichlorophenoxyacetic acid chlorophyll a glyphosate community dynamics glyphosate herbicide microbial community microcosm periphyton phytoplankton alga Article autotrophy concentration (parameters) controlled study dry weight ecotoxicity microbial community microcosm nonhuman periphyton physical resistance phytoplankton population abundance species composition Staurastrum turbidity algae Leptolyngbya sp. Staurastrum Lozano, V.L. Vinocur, A. Sabio y García, C.A. Allende, L. Cristos, D.S. Rojas, D. Wolansky, M. Pizarro, H. Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| topic_facet |
2,4-D Freshwater Glyphosate Mixture Periphyton Phytoplankton 2,4 dichlorophenoxyacetic acid chlorophyll a glyphosate community dynamics glyphosate herbicide microbial community microcosm periphyton phytoplankton alga Article autotrophy concentration (parameters) controlled study dry weight ecotoxicity microbial community microcosm nonhuman periphyton physical resistance phytoplankton population abundance species composition Staurastrum turbidity algae Leptolyngbya sp. Staurastrum |
| description |
Glyphosate (G) and 2,4-D herbicides are massively applied in agriculture worldwide and the use of their mixture is currently a very common practice. We carried out two experiments using microcosms under laboratory conditions for 7 days each. In the first experiment, we analyzed changes in species composition, abundance and chlorophyll a of phytoplankton due to 10 treatments: control; low, medium and high concentrations of G and 2,4-D; and mixtures at low, medium and high concentrations at a G:2,4-D ratio of 1:0.45. In the second experiment we studied changes on the composition of the autotrophic fraction and abundance, chlorophyll a, dry weight (DW), ash free dry weight (AFDW) and autotrophic index of periphyton developed in artificial substrata under 7 treatments considering the lowest doses that showed an effect in the previous phytoplankton experiment: control; pure G and Glifosato Atanor® (glyphosate-based formulation); pure 2,4-D and Asi Max 50® (2,4-D-based formulation); mixtures of the a.i at a G:2,4-D ratio of 1:0.45, and mixture of Glifosato Atanor® + Asi Max®. Results showed that G was more toxic than 2,4-D to the algal fraction, decreasing chlorophyll a, turbidity and algal abundances in the phytoplankton experiment. The effects of the mixture on phytoplankton were mainly additive, except for total and Staurastrum sp. live abundances where an antagonistic effect between herbicides was recorded. Periphyton showed more resistance to the herbicides as it was less affected than phytoplankton by the active ingredients and commercial formulations. The high development of Leptolyngbya sp. due to the impact of the herbicide mixture on periphyton might represent the beginning of a more conspicuous community to prevent the impact of contaminants. The study of the impacts of herbicide mixtures on freshwater systems requires the analysis of several variables to better assess the responses of key microbial communities and to predict more realistic scenarios. © 2017 Elsevier Inc. |
| format |
JOUR |
| author |
Lozano, V.L. Vinocur, A. Sabio y García, C.A. Allende, L. Cristos, D.S. Rojas, D. Wolansky, M. Pizarro, H. |
| author_facet |
Lozano, V.L. Vinocur, A. Sabio y García, C.A. Allende, L. Cristos, D.S. Rojas, D. Wolansky, M. Pizarro, H. |
| author_sort |
Lozano, V.L. |
| title |
Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| title_short |
Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| title_full |
Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| title_fullStr |
Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| title_full_unstemmed |
Effects of glyphosate and 2,4-D mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| title_sort |
effects of glyphosate and 2,4-d mixture on freshwater phytoplankton and periphyton communities: a microcosms approach |
| url |
http://hdl.handle.net/20.500.12110/paper_01476513_v148_n_p1010_Lozano |
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