Research Article by PNAS About Globally Used Pesticide Atrazine and the Effects On Frogs Intersexuality

By Toni Cairns Abstract Distraxtions

Atrazine induces complete feminization and chemical castration in male African clawed frogs (Xenopus laevis)

Tyrone B. Hayes tyrone@berkeley.edu, Vicky Khoury, Anne Narayan, +7, and Sherrie GallipeauAuthors Info & Affiliations

Edited* by David B. Wake, University of California, Berkeley, CA, and approved January 15, 2010 (received for review August 20, 2009)

March 9, 2010

107 (10) 4612-4617

https://doi.org/10.1073/pnas.0909519107 

Article online at www.pnas.org [Online] at 

https://www.pnas.org/doi/full/10.1073/pnas.0909519107

"Abstract

The herbicide atrazine is one of the most commonly applied pesticides in the world. As a result, atrazine is the most commonly detected pesticide contaminant of ground, surface, and drinking water. Atrazine is also a potent endocrine disruptor that is active at low, ecologically relevant concentrations. Previous studies showed that atrazine adversely affects amphibian larval development. The present study demonstrates the reproductive consequences of atrazine exposure in adult amphibians.

Atrazine-exposed males were both demasculinized (chemically castrated) and completely feminized as adults. 

Ten percent of the exposed genetic males developed into functional females that copulated with unexposed males and produced viable eggs. 

Atrazine-exposed males suffered from depressed testosterone, decreased breeding gland size, demasculinized/feminized laryngeal development, suppressed mating behavior, reduced spermatogenesis, and decreased fertility. These data are consistent with effects of atrazine observed in other vertebrate classes. 

The present findings exemplify the role that atrazine and other endocrine-disrupting pesticides likely play in global amphibian declines."




Who is PNAS?

"The Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS), is an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences."

https://www.pnas.org 



PNAS.org

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