1
|
Awkerman JA, Lavelle CM, Henderson WM, Hemmer BL, Lilavois CR, Harris P, Zielinski N, Hoglund MD, Glinski DA, MacMillan D, Ford J, Seim RF, Moso E, Raimondo S. Cross-Taxa Distinctions in Mechanisms of Developmental Effects for Aquatic Species Exposed to Trifluralin. Environ Toxicol Chem 2020; 39:1797-1812. [PMID: 32445211 PMCID: PMC10740104 DOI: 10.1002/etc.4758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/17/2020] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Standard ecological risk assessment practices often rely on larval and juvenile fish toxicity data as representative of the amphibian aquatic phase. Empirical evidence suggests that endpoints measured in fish early life stage tests are often sufficient to protect larval amphibians. However, the process of amphibian metamorphosis relies on endocrine cues that affect development and morphological restructuring and are not represented by these test endpoints. The present study compares developmental endpoints for zebrafish (Danio rerio) and the African clawed frog (Xenopus laevis), 2 standard test species, exposed to the herbicide trifluralin throughout the larval period. Danio rerio were more sensitive and demonstrated a reduction in growth measurements with increasing trifluralin exposure. Size of X. laevis at metamorphosis was not correlated with exposure concentration; however, time to metamorphosis was delayed relative to trifluralin concentration. Gene expression patterns indicate discrepancies in response by D. rerio and X. laevis, and dose-dependent metabolic activity suggests that trifluralin exposure perturbed biological pathways differently within the 2 species. Although many metabolites were correlated with exposure concentration in D. rerio, nontargeted hepatic metabolomics identified a subset of metabolites that exhibited a nonmonotonic response to trifluralin exposure in X. laevis. Linking taxonomic distinctions in cellular-level response with ecologically relevant endpoints will refine assumptions used in interspecies extrapolation of standard test effects and improve assessment of sublethal impacts on amphibian populations. Environ Toxicol Chem 2020;39:1797-1812. Published 2020. This article is a US government work and is in the public domain in the USA.
Collapse
Affiliation(s)
- Jill A. Awkerman
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Candice M. Lavelle
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - W. Matthew Henderson
- Exposure Methods and Measurement Division, EPA, 960 College Station Road, Athens, GA, USA
| | - Becky L. Hemmer
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Crystal R. Lilavois
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Peggy Harris
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Nick Zielinski
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Marilynn D. Hoglund
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Donna A. Glinski
- Grantee to the USEPA via Oak Ridge Institute for Science and Education, Exposure Methods and Measurement Division, EPA, 960 College Station Road, Athens, GA, USA
| | - Denise MacMillan
- Research Cores Unit, National Health and Environmental Effects Response Laboratory, Research Triangle Park, NC, USA
| | - Jermaine Ford
- Research Cores Unit, National Health and Environmental Effects Response Laboratory, Research Triangle Park, NC, USA
| | - Roland F. Seim
- Grantee to the USEPA via Oak Ridge Institute for Science and Education, Exposure Methods and Measurement Division, EPA, 960 College Station Road, Athens, GA, USA
| | - Elizabeth Moso
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| | - Sandy Raimondo
- Gulf Ecosystem Measurement & Modeling Division, EPA, 1 Sabine Island Drive, Gulf Breeze, FL, USA
| |
Collapse
|