File(s) not publicly available

Effects of the glyphosate-based herbicide Roundup WeatherMax on metamorphosis of wood frogs (Lithobates sylvaticus) in natural wetlands

journal contribution
posted on 06.12.2017, 00:00 authored by Chantal LanctotChantal Lanctot, C Robertson, L Navarro-Martín, C Edge, Steven MelvinSteven Melvin, J Houlahan, V Trudeau
Amphibian tadpoles develop in aquatic environments where they are susceptible to the effects of pesticides and other environmental contaminants. Glyphosate-based herbicides are currently the most commonly used herbicide in the world and have been shown to affect survival and development of tadpoles under laboratory and mesocosm conditions. In the present study, whole wetland manipulations were used to determine if exposure to an agriculturally relevant application of Roundup WeatherMax, a herbicide formulation containing the potassium salt of glyphosate and an undisclosed surfactant, influences the development of wood frog tadpoles (Lithobates sylvaticus) under natural conditions. Wetlands were divided in half with an impermeable curtain so that each wetland contained a treatment and control side. Tadpoles were exposed to two pulses of this herbicide at an environmentally realistic concentration (ERC, 0.21 mg acid equivalent (a.e.)/L) and the predicted maximum environmental concentration (PMEC, 2.89 mg a.e./L), after which abundance, growth, development, and mRNA levels of genes involved in tadpole metamorphosis were measured. Results present little evidence that exposure to this herbicide affects abundance, growth and development of wood frog tadpoles. As part of the Long-term Experimental Wetlands Area (LEWA) project, this research demonstrates that typical agricultural use of Roundup WeatherMax poses minimal risk to larval amphibian development. However, our gene expression data (mRNA levels) suggests that glyphosate-based herbicides have the potential to alter hormonal pathways during tadpole development.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Issue

140-141

Start Page

48

End Page

57

Number of Pages

10

ISSN

0166-445X

Location

Netherlands

Publisher

Elsevier

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Environmental Management; Centre for Environmental Management; University of Alabama; University of New Brunswick; University of Ottawa;

Era Eligible

Yes

Journal

Aquatic toxicology.