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PEREZ Gonzalo Luis

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Título:

Glyphosate input modifies microbial community structure in clear and turbid freshwater systems

Autor/es:

PIZARRO, H.; SOLANGE, V.; VINOCUR, A; PÉREZ, G. L.; FERRARO M.; MENENDEZ HELMAN, R. J.; DOS SANTOS AFONSO, M.

Revista:

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

Editorial:

SPRINGER HEIDELBERG

Referencias:

Lugar: HEIDELBERG; Año: 2015 vol. 23 p. 5143 - 5153

ISSN:

0944-1344

Resumen:

Since it was commercially introduced in 1974, glyphosate isone of the most commonly used herbicides in agriculture worldwide and there isgrowing concern about its adverse effects on the environment.Assuming thatglyphosate may increase the organic turbidity of water bodies, weevaluated theeffect of a single application of 2.4 ± 0.1 mg l-1 of glyphosate (technicalgrade) on freshwater bacterioplankton and phytoplankton (pico- , micro- andnanophytoplankton) and on the physical and chemical properties of the water. Weused outdoor experimental mesocosms under clear and oligotrophic (phytoplanktonicchlorophyll a = 2.04 ug l-1; turbidity = 2.0 NTU) and organic turbid andeutrophic (phytoplanktonic chlorophyll a = 50.3 ug l-1; turbidity = 16.0NTU)scenarios. Samplings were conducted at the beginning of the experiment andat1, 8,, 19 and 33 days after glyphosateaddition. For both typologies, the herbicide affected the abiotic wáterproperties (with a marked increase of total phosphorus) but it did not affectthe structure of micro-and nanophytoplankton. In clear waters, glyphosatetreatment induced a trend toward higher bacteria and picoeukaryotes abundances,while there was a 2 to 2.5-fold increase in picocyanobacteria number. In turbidwaters, without picoeukaryotes at the beginning of the experiment, glyphosatedecreased bacteria abundance but increased the number ofpicocyanobacteria,suggesting a direct favorable effect. Moreover, our resultsshow that the impact of the herbicide was observed in microorganisms from botholigo- and eutrophicconditions, indicating that the impact would be independentof the trophic status of the water body.

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