Effects of the agricultural pesticides atrazine, chlorothalonil, and endosulfan on South Florida microbial assemblages

Ecotoxicology
Holly F DowningJohn R Kucklick

Abstract

One of the most impacted watersheds in the US in terms of pesticide usage is South Florida, which drains through a series of canals into the Florida Everglades and Florida Bay. Single species responses to pesticide exposure are well documented; however, little is known about community level responses to pesticides, especially at lower trophic levels. Microbial assemblages at two sites along the C-111 canal in the Dade County agricultural area in October 1999 (wet season, limited pesticide application) and in February 2000 (dry season, heavy pesticide application) were colonized onto artificial substrates, transported to the laboratory and exposed to atrazine (20 and 200 microg/l), chlorothalonil (2 and 20 microg/l), or endosulfan (1 and 10 microg/l). Structural and functional responses were measured at 24 h and 168 h post-dose. Regardless of site, season or exposure time, the highest atrazine dose (200 microg/l) significantly reduced chlorophyll a, phototrophic carbon assimilation and bacterial biomass, but stimulated heterotrophic bacterial productivity. Chlorophyll a was also significantly reduced by 20 microg/l atrazine (October only). The lowest endosulfan dose (1 microg/l) significantly increased phototrophic carbon assimi...Continue Reading

Citations

May 14, 2010·Archives of Environmental Contamination and Toxicology·Emanuela Cristina Freitas, Odete Rocha
Sep 11, 2012·Applied and Environmental Microbiology·Zachery R StaleyValerie J Harwood
Feb 11, 2015·The Science of the Total Environment·Geovane B ReimcheMatheus A G Nunes
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Jan 1, 2014·Ecological Applications : a Publication of the Ecological Society of America·Zachery R StaleyValerie J Harwood
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Jul 3, 2021·Sensors·Nurul Illya Muhamad FauziHazwani Suhaila Hashim

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