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Baldwin RA, Becchetti TA, Meinerz R, Quinn N. Potential impact of diphacinone application strategies on secondary exposure risk in a common rodent pest: implications for management of California ground squirrels. Environ Sci Pollut Res Int 2021; 28:45891-45902. [PMID: 33881695 PMCID: PMC8364526 DOI: 10.1007/s11356-021-13977-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
Anticoagulant rodenticides are a common tool used to manage rodents in agricultural systems, but they have received increased scrutiny given concerns about secondary exposure in non-target wildlife. Rodenticide application strategy is one factor that influences exposure risk. To understand the impact of application strategy, we tested residues of a first-generation anticoagulant (diphacinone) in liver tissue of radiotransmittered California ground squirrels (Otospermophilus beecheyi) following spot treatments, broadcast applications, and bait station applications in rangelands in central California during summer and autumn 2018-2019. We also documented the amount of bait applied, the mean time from bait application until death, and the proportion of ground squirrels that died belowground. We documented the greatest amount of bait applied via bait stations and the least by broadcast applications. We did not document a difference in diphacinone residues across any application strategy, although survivors had an order of magnitude lower concentration of diphacinone than mortalities, potentially lowering secondary exposure risk. We did not observe any difference among bait delivery methods in time from bait application to death, nor did we identify any impact of seasonality on any of the factors we tested. The vast majority of mortalities occurred belowground (82-91%), likely reducing secondary exposure. Secondary exposure could be further reduced by daily carcass searches. Results from this study better define risk associated with first-generation anticoagulant rodenticide applications, ultimately assisting in development of management programs that minimize non-target exposure.
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Affiliation(s)
- Roger A Baldwin
- Department of Wildlife, Fish, and Conservation Biology, University of California, One Shields Avenue, Davis, CA, 95616, USA.
| | - Theresa A Becchetti
- University of California Cooperative Extension, 3800 Cornucopia Way, Ste A, Modesto, CA, 95358, USA
| | - Ryan Meinerz
- Department of Wildlife, Fish, and Conservation Biology, University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Niamh Quinn
- University of California Cooperative Extension, South Coast Research and Extension Center, 7601 Irvine Blvd, Irvine, CA, 92618, USA
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Riegerix RC, Tanner M, Gale R, Tillitt DE. Acute toxicity and clotting times of anticoagulant rodenticides to red-toothed (Odonus niger) and black (Melichthys niger) triggerfish, fathead minnow (Pimephales promelas), and largemouth bass (Micropterus salmoides). Aquat Toxicol 2020; 221:105429. [PMID: 32035410 DOI: 10.1016/j.aquatox.2020.105429] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/30/2020] [Accepted: 01/31/2020] [Indexed: 06/10/2023]
Abstract
Anticoagulant rodenticides (ARs) are used in rat eradication efforts on island wildlife refuges. AR bait pellets can get into coral reef areas during broadcasting and lead to exposure of non-target organisms, such as marine fishes. The objective of this study was to determine the sensitivity of representative saltwater fishes, Red-toothed triggerfish (Odonus niger) and Black triggerfish (Melichthys niger), and common freshwater fishes, fathead minnow (Pimephales promelas), and largemouth bass (Micropterus salmoides) to first generation ARs, diphacinone (DPN) and chlorophacinone (CPN), as well as a second-generation AR, brodifacoum (BROD). Acute toxicity of ARs was evaluated by single dose, intraperitoneal injections. The median lethal dose (LD50) ranges were 137-175 μg DPN/g, 155-182 μg CPN/g, and 36-48 μg BROD/g for Red-toothed triggerfish and 90-122 μg DPN/g, 125-164 μg CPN/g, and 50-75 μg BROD/g for black triggerfish. Laboratory surrogate test fish species fathead minnow and largemouth bass were of similar sensitivity toward AR-induced toxicity compared to triggerfish based on LD50 values. Sublethal effects on elevated clotting time occurred in dose-dependent fashion in all fish tested. Fish appear to have low sensitivity to AR chemicals as compared to other taxa, in particular mammals and birds, based on across-taxa comparisons of species sensitivity distributions of whole body, single dose acute lethality (LD50 values). The sensitivity of fish to waterborne exposures of ARs has yet to be fully evaluated and indeed may prove more hazardous to fish.
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Affiliation(s)
- Rachelle C Riegerix
- Columbia Environmental Research Center, U.S. Geological Survey, Department of Interior 4200 New Haven Road Columbia, MO 65201, USA; University of Missouri, Division of Biological Sciences, Columbia, MO 65211, USA
| | - Michael Tanner
- Columbia Environmental Research Center, U.S. Geological Survey, Department of Interior 4200 New Haven Road Columbia, MO 65201, USA
| | - Robert Gale
- Columbia Environmental Research Center, U.S. Geological Survey, Department of Interior 4200 New Haven Road Columbia, MO 65201, USA
| | - Donald E Tillitt
- Columbia Environmental Research Center, U.S. Geological Survey, Department of Interior 4200 New Haven Road Columbia, MO 65201, USA.
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Hsu CW, Hsieh JH, Huang R, Pijnenburg D, Khuc T, Hamm J, Zhao J, Lynch C, van Beuningen R, Chang X, Houtman R, Xia M. Differential modulation of FXR activity by chlorophacinone and ivermectin analogs. Toxicol Appl Pharmacol 2016; 313:138-148. [PMID: 27773686 DOI: 10.1016/j.taap.2016.10.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 09/10/2016] [Accepted: 10/18/2016] [Indexed: 02/02/2023]
Abstract
Chemicals that alter normal function of farnesoid X receptor (FXR) have been shown to affect the homeostasis of bile acids, glucose, and lipids. Several structural classes of environmental chemicals and drugs that modulated FXR transactivation were previously identified by quantitative high-throughput screening (qHTS) of the Tox21 10K chemical collection. In the present study, we validated the FXR antagonist activity of selected structural classes, including avermectin anthelmintics, dihydropyridine calcium channel blockers, 1,3-indandione rodenticides, and pyrethroid pesticides, using in vitro assay and quantitative structural-activity relationship (QSAR) analysis approaches. (Z)-Guggulsterone, chlorophacinone, ivermectin, and their analogs were profiled for their ability to alter CDCA-mediated FXR binding using a panel of 154 coregulator motifs and to induce or inhibit transactivation and coactivator recruitment activities of constitutive androstane receptor (CAR), liver X receptor alpha (LXRα), or pregnane X receptor (PXR). Our results showed that chlorophacinone and ivermectin had distinct modes of action (MOA) in modulating FXR-coregulator interactions and compound selectivity against the four aforementioned functionally-relevant nuclear receptors. These findings collectively provide mechanistic insights regarding compound activities against FXR and possible explanations for in vivo toxicological observations of chlorophacinone, ivermectin, and their analogs.
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Affiliation(s)
- Chia-Wen Hsu
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA
| | - Jui-Hua Hsieh
- National Toxicology Program, National Institutes of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | - Ruili Huang
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA
| | - Dirk Pijnenburg
- PamGene International B.V., Wolvenhoek 10, 5211 HH 's-Hertogenbosch, The Netherlands
| | - Thai Khuc
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA
| | - Jon Hamm
- Integrated Laboratory System, Inc., Morrisville, NC, USA
| | - Jinghua Zhao
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA
| | - Caitlin Lynch
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA
| | - Rinie van Beuningen
- PamGene International B.V., Wolvenhoek 10, 5211 HH 's-Hertogenbosch, The Netherlands
| | - Xiaoqing Chang
- Integrated Laboratory System, Inc., Morrisville, NC, USA
| | - René Houtman
- PamGene International B.V., Wolvenhoek 10, 5211 HH 's-Hertogenbosch, The Netherlands
| | - Menghang Xia
- NIH Chemical Genomics Center, National Center for Advancing Translational Sciences, National Institutes of Health, Bethesda, MD, USA.
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