Acute and chronic toxicity of Roundup Weathermax® and Ignite® 280 SL to larval Spea multiplicata and S. bombifrons from the Southern High Plains, USA

Simon K. Dinehart, Loren M. Smith, Scott T. McMurry, Philip N. Smith, Todd A. Anderson, David A. Haukos

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Pesticides have been implicated in widespread amphibian declines. We assessed acute and chronic toxicity of two widely used herbicides to larval New Mexico (Spea multiplicata) and Plains (S. bombifrons) spadefoots from cropland and native grassland playas. Roundup WeatherMAX® (WM) toxicity estimates (48- and 216-h LC50; 48-h LC1) for both species were similar to environmental concentrations expected from accidental overspray. Chronic (30-day) exposure to WM at predicted environmental concentrations (2.0 and 2.8 mg glyphosate acid equivalents/L) reduced survival of both species. Ignite® 280 SL (IG) toxicity estimates (48-h LC50 and LC1) for both species were above predicted environmental concentrations of 1.0 mg glufosinate/L. Chronic exposure to predicted environmental concentrations of IG did not reduce survival of either species. Toxicity test results suggest that at predicted environmental concentrations IG would not cause extensive mortalities among larval New Mexico and Plains spadefoots. However, WM may cause extensive mortality among larvae of these species.

Original languageEnglish
Pages (from-to)2610-2617
Number of pages8
JournalEnvironmental Pollution
Volume158
Issue number8
DOIs
StatePublished - Aug 2010

Keywords

  • Amphibian decline
  • Glyphosate
  • Herbicide
  • Roundup

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