Surface water mitigates the anti-metamorphic effects of elevated perchlorate concentrations in New Mexico spadefoot toad larvae (Spea multiplicata)

Melissa A. Sandoz, Mike Wages, Kim J. Wooten, Sheree L. Clendening, Lucas R. Smith, Brian Mulhearn, Philip N. Smith

Research output: Contribution to journalArticle

Abstract

Perchlorate (ClO4 ) has potential to negatively impact amphibian populations by inhibiting thyroid hormone production, and thus metamorphosis in developing larvae. However, variability exists in species sensitivity, and there is evidence suggesting that natural surface waters can mitigate the anti-metamorphic potential of perchlorate. New Mexico spadefoot toad tadpoles, Spea multiplicata, were exposed to natural surface waters spiked with nominal concentrations of 0, 1000, 1350, 1710, 3000, 5110, and 8000 μg/L perchlorate ion for up to 42 days. No consistent dose-response trends were observed in mortality, rate of metamorphosis, Gosner stage, mass, or length. This study suggests that perchlorate exposure to concentrations as high as 8000 μg/L in natural surface waters does not result in adverse effects on New Mexico spadefoot tadpoles and emphasizes the importance of using site-specific conditions and species when evaluating ecological risks in perchlorate-impacted areas.

Original languageEnglish
Pages (from-to)17839-17844
Number of pages6
JournalEnvironmental Science and Pollution Research
Volume24
Issue number21
DOIs
StatePublished - Jul 1 2017

Keywords

  • Ecological risk
  • Metamorphosis
  • Perchlorate
  • Spea multiplicata
  • Surface water

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