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Szapu JS, Cserkész T, Pirger Z, Kiss C, Lanszki J. Exposure to anticoagulant rodenticides in steppe polecat (Mustela eversmanii) and European polecat (Mustela putorius) in central Europe. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 948:174282. [PMID: 38960164 DOI: 10.1016/j.scitotenv.2024.174282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 06/20/2024] [Accepted: 06/23/2024] [Indexed: 07/05/2024]
Abstract
Poisoning caused by coumarin-type anticoagulant rodenticides (ARs) stands as the predominant method for controlling rodents globally. ARs, through secondary poisoning, pose a significant threat to predators due to their lethal and sublethal effects. We examined the concentration of accumulated ARs in liver samples of mostly road-killed steppe polecats (Mustela eversmanii) and European polecats (M. putorius) collected throughout Hungary between 2005 and 2021. The steppe polecat samples were found mainly from Eastern Hungary, while European polecats from Western Hungary. We measured the concentration of six residues by HPLC-FLD. Our analysis revealed the presence of one first-generation and four second-generation ARs in 53% of the steppe polecat (36) and 39% of the European polecat (26) samples. In 17 samples we detected the presence of at least two AR compounds. Although we did not find significant variance in AR accumulation between the two species, steppe polecats displayed greater prevalence and maximum concentration of ARs, whereas European polecat samples exhibited a more diverse accumulation of these compounds. Brodifacoum and bromadiolone were the most prevalent ARs; the highest concentrations were 0.57 mg/kg and 0.33 mg/kg, respectively. The accumulation of ARs was positively correlated with human population density and negatively correlated with the extent of the more natural habitats in both species. To the best of our knowledge, this is the first study to demonstrate anticoagulant rodenticide exposure in steppe polecats globally, and for European polecats in Central European region. Although the extent of AR accumulation in European polecat in Hungary appears comparatively lower than in many other European countries, the issue of secondary poisoning remains a serious problem as these ARs intrude into food webs. Reduced and more prudent usage of pesticides would provide several benefits for wildlife, included humans. However, we advocate a prioritization of ecosystem services through the complete prohibition of the toxicants.
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Affiliation(s)
- Julianna Szulamit Szapu
- Doctoral School of Biology, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/c, 1117 Budapest, Hungary.
| | - Tamás Cserkész
- Hungarian Natural History Museum, Baross utca 13, 1088 Budapest, Hungary.
| | - Zsolt Pirger
- HUN-REN Balaton Limnological Research Institute, Klebelsberg Kunó utca 3, 8237 Tihany, Hungary; National Laboratory for Water Science and Water Security, Balaton Limnological Research Institute, Klebelsberg Kunó utca 3, 8237 Tihany, Hungary.
| | - Csaba Kiss
- Department of Zoology, Institute of Biology, Eszterházy Károly Catholic University, Eszterházy tér 1, 3300 Eger, Hungary.
| | - József Lanszki
- HUN-REN Balaton Limnological Research Institute, Klebelsberg Kunó utca 3, 8237 Tihany, Hungary; Institute of Animal Science, Hungarian University of Agriculture and Life Sciences, Guba Sándor út 40, 7400 Kaposvár, Hungary.
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Sharma A, Singla N, Bansal N. Unveiling the potency of ready-to-use brodifacoum blocks in lesser bandicoot rats: exploring toxicity, blood clotting factors, and organ histology. Toxicol Res (Camb) 2024; 13:tfae116. [PMID: 39100860 PMCID: PMC11291953 DOI: 10.1093/toxres/tfae116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 07/15/2024] [Accepted: 07/23/2024] [Indexed: 08/06/2024] Open
Abstract
Background The present study unveiled the effectiveness of ready-to-use brodifacoum blocks (0.005%) against the prevalent field rat species in southeast Asia, Bandicota bengalensis. Brodifacoum, a more potent second-generation anticoagulant, offers a solution for managing rodents resistant to other anticoagulants of its class. Methodology Male and female bandicoot rats caught wild were exposed to brodifacoum for 1, 2, and 3 days in both the no-choice and bi-choice tests. The observations included mortality rates, impact on body weight, food consumption, blood clotting factors, organ weights, and histological changes. Results Results indicated 100% mortality within 2-3 days in the no-choice tests, and 50.00%-83.33% mortality in the bi-choice tests within 5 to 8 days. The median lethal feeding periods were determined to be 2.10 and 2.33 days for male and female rats, respectively. Toxicity symptoms included bleeding from the nose, gums, and feet. While no significant effects were observed on body weight or organ weights, food consumption decreased notably in no-choice tests. Additionally, significant increases in prothrombin time and activated partial thromboplastin time were noted 24 h post-treatment in the no-choice tests, with post-treatment international normalized ratios of 9.45-14.20 and 1.52-3.03 in the no-choice and the bi-choice tests, respectively. Histological analysis revealed mild to severe necrotic changes in the liver and kidneys after brodifacoum treatment. Conclusions Overall, this study underscores the potential of ready-to-use brodifacoum blocks as an effective tool for rodent population control, offering a viable alternative to other second-generation anticoagulant rodenticides.
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Affiliation(s)
- Arshdeep Sharma
- Department of Zoology, Punjab Agricultural University, Ferozepur Road, Punjab, Ludhiana 141004, India
| | - Neena Singla
- Department of Zoology, Punjab Agricultural University, Ferozepur Road, Punjab, Ludhiana 141004, India
| | - Neelam Bansal
- Department of Veterinary Anatomy, Guru Angad Dev Veterinary and Animal Sciences University, Ferozepur Road, Punjab, Ludhiana 141004, India
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Spadetto L, Gómez-Ramírez P, Zamora-Marín JM, León-Ortega M, Díaz-García S, Tecles F, Fenoll J, Cava J, Calvo JF, García-Fernández AJ. Active monitoring of long-eared owl (Asio otus) nestlings reveals widespread exposure to anticoagulant rodenticides across different agricultural landscapes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 918:170492. [PMID: 38307270 DOI: 10.1016/j.scitotenv.2024.170492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 02/04/2024]
Abstract
The widespread use of anticoagulant rodenticides (ARs) poses a worldwide threat to farmland wildlife. These compounds accumulate in tissues of both target and non-target species, potentially endangering both direct consumers and their predators. However, investigations on ARs in blood of free-ranging predatory birds are rare. Here, the long-eared owl (Asio otus) has been used as a model predator to assess AR exposure in different agricultural landscapes from a Mediterranean semiarid region. A total of 69 owlets from 38 nests were blood-sampled over 2021 and 2022, aiming to detect AR residues and explore factors that determine their exposure, such as land uses. In addition, prothrombin time (PT) test was conducted to assess potential effects of AR contamination. Overall, nearly all the samples (98.6 %) tested positive for at least one compound and multiple ARs were found in most of the individuals (82.6 %). Among the ARs detected, flocoumafen was the most common compound (88.4 % of the samples). AR total concentration (ΣARs) in blood ranged from 0.06 to 34.18 ng mL-1, detecting the highest levels in the most intensively cultivated area. The analysis of owl pellets from 19 breeding territories showed relevant among-site differences in the contribution of rodents and birds into the diet of long-eared owls, supporting its high dietary plasticity and indicating AR presence at multiple trophic levels. Moreover, a positive and significant correlation was found between ΣARs and PT (Rho = 0.547, p < 0.001), which demonstrates the direct effect of ARs on free-living nestlings. Our results provide a preliminary overview of AR exposure in a little-studied owl species inhabiting agricultural and rural landscapes. Despite the low detected levels, these findings indicate widespread exposure -often to multiple compounds- from early life stages, which raises concern and draws attention to an ongoing and unresolved contamination issue.
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Affiliation(s)
- Livia Spadetto
- Toxicology Research Group, Faculty of Veterinary, Campus de Espinardo, University of Murcia, 30100 Murcia, Spain
| | - Pilar Gómez-Ramírez
- Toxicology Research Group, Faculty of Veterinary, Campus de Espinardo, University of Murcia, 30100 Murcia, Spain.
| | - José Manuel Zamora-Marín
- ULULA Association for Owl Study and Conservation, 30100 Murcia, Spain; Department of Applied Biology, Centro de Investigación e Innovación Agroalimentaria (CIAGRO-UMH), Miguel Hernández University of Elche, Elche, Spain; Department of Zoology and Physical Anthropology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain
| | - Mario León-Ortega
- ULULA Association for Owl Study and Conservation, 30100 Murcia, Spain
| | - Sarah Díaz-García
- ULULA Association for Owl Study and Conservation, 30100 Murcia, Spain
| | - Fernando Tecles
- Interdisciplinary Laboratory of Clinical Analysis (Interlab-UMU), Veterinary School, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, 30100 Murcia, Spain
| | - José Fenoll
- Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario, IMIDA, 30150 Murcia, Spain
| | - Juana Cava
- Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario, IMIDA, 30150 Murcia, Spain
| | - José Francisco Calvo
- Department of Ecology and Hydrology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain
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Fourel I, Roque F, Orabi P, Augiron S, Couzi FX, Puech MP, Chetot T, Lattard V. Stereoselective bioaccumulation of chiral anticoagulant rodenticides in the liver of predatory and scavenging raptors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170545. [PMID: 38296081 DOI: 10.1016/j.scitotenv.2024.170545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/22/2024] [Accepted: 01/27/2024] [Indexed: 02/04/2024]
Abstract
Second-generation anticoagulant rodenticides (SGARs) are persistent chiral pesticides used to control rodent populations. Raptors are protected species and may be exposed through the ingestion of rodents contaminated with SGARs. Commercial formulations of SGARs are a mixture of four stereoisomers (E1, E2, E3, E4): the cis- and trans-diastereoisomers are each a racemic mixture of two enantiomers. In this study, the residue levels of all SGARs (bromadiolone, difenacoum, brodifacoum, difethialone, flocoumafen) were evaluated in the liver of 529 raptor carcasses. All species (n = 18) and 75 % of individuals (n = 396) were SGAR positive and 29 % (n = 154) had summed hepatic concentrations above 100 ng/g ww. Concentrations were higher for predators with facultative scavenging behaviors than for predators and obligate scavengers. Bromadiolone, brodifacoum and difenacoum had equivalent hepatic prevalence (between 48.9 and 49.9 %), and difethialone was detected less frequently (31.7 %). Concentrations and enantiomeric fractions of the four stereoisomers of all SGARs are described in to demonstrate the biological enantioselectivity of these chiral pesticides in the food chain. A difference was observed between the proportions of SGARs diastereoisomers and stereoisomers in the liver of all raptor species and in commercial baits. The enantioselective bioaccumulation of E1-trans-bromadiolone, E3-cis-brodifacoum, E1-cis-difenacoum and E3-cis-difethialone was characterized and represented 96.8 % of total SGARs hepatic residues. While hepatic concentrations were heterogeneous, the proportions of stereoisomers and diastereoisomers were homogeneous with no inter-individual or inter-species differences (only E1-trans-bromadiolone is present in hepatic residues). However, proportions of brodifacoum stereoisomers and diastereoisomers were more scattered, probably due to their slower elimination. This could provide an opportunity to date the exposure of individuals to brodifacoum. We highlight the need to consider each SGAR as four molecular entities (four stereoisomers) rather than one. These findings suggest new commercial formulations with the less persistent stereoisomers could reduce secondary exposure of non-target species.
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Affiliation(s)
- Isabelle Fourel
- USC 1233-INRAE RS2GP, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France.
| | - Florence Roque
- CNITV, VetAgro Sup, 1 avenue Bourgelat, 69280 Marcy l'Etoile, France
| | - Pascal Orabi
- French Bird Protection League (LPO France), France
| | - Steve Augiron
- SEOR, 13 ruelle des Orchidées, 97440 Saint-André, La Réunion, France
| | | | | | - Thomas Chetot
- USC 1233-INRAE RS2GP, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233-INRAE RS2GP, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
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Williams EJ, Cotter SC, Soulsbury CD. Consumption of Rodenticide Baits by Invertebrates as a Potential Route into the Diet of Insectivores. Animals (Basel) 2023; 13:3873. [PMID: 38136910 PMCID: PMC10740866 DOI: 10.3390/ani13243873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/11/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Non-target species are commonly exposed to anticoagulant rodenticides worldwide, which may pose a key threat to declining species. However, the main pathway of exposure is usually unknown, potentially hindering conservation efforts. This study aimed to examine whether baits mixed with the biomarker rhodamine B can be used to track invertebrate consumption of rodenticides in a field environment, using this to observe whether invertebrate prey are a potential vector for anticoagulant rodenticides in the diet of insectivores such as the European hedgehog (Erinaceus europaeus). Rhodamine B baits were found to create an observable response. Uptake was negligible in captured insects; however, 20.7% of slugs and 18.4% of snails captured showed uptake of bait. Maximum temperature, distance from bait, proximity to buildings, and the addition of copper tape to bait boxes all influenced the rate of bait uptake in molluscs. Based on these data, it seems likely that molluscs could be a source of rodenticide poisoning in insectivores. This research demonstrates which prey may pose exposure risks to insectivores and likely environmental factors, knowledge of which can guide effective mitigation measures. We suggest that further investigation into using mollusc repellents around bait boxes should be considered.
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Affiliation(s)
- Emily J. Williams
- School of Life and Environmental Sciences, University of Lincoln, Lincoln LN6 7TS, UK; (S.C.C.); (C.D.S.)
- UK Centre for Ecology & Hydrology, Wallingford, Oxon OX10 8BB, UK
| | - Sheena C. Cotter
- School of Life and Environmental Sciences, University of Lincoln, Lincoln LN6 7TS, UK; (S.C.C.); (C.D.S.)
| | - Carl D. Soulsbury
- School of Life and Environmental Sciences, University of Lincoln, Lincoln LN6 7TS, UK; (S.C.C.); (C.D.S.)
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Rached A, Mahjoub T, Fafournoux A, Barbier B, Fourel I, Caruel H, Lefebvre S, Lattard V. Interest of the faecal and plasma matrix for monitoring the exposure of wildlife or domestic animals to anticoagulant rodenticides. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 97:104033. [PMID: 36481560 DOI: 10.1016/j.etap.2022.104033] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Anticoagulant rodenticides (ARs), particularly second-generation compounds (SGAR), are known to be a potential threat to unintended species due to their tissue persistence. The liver is the storage tissue of ARs and is a matrix of choice in diagnosing exposure and intoxication of non-target fauna. However, it is only available on dead animals. Blood and faeces can be used on living animals. These two biological matrices were compared in terms of their relevance to exposure to ARs. In addressing this question, we compared the faecal, plasma and liver concentrations of bromadiolone, one of the SGAR frequently implicated in wildlife exposure. We studied this comparison at the individual level and at the population level, considering three influencing factors: dose, sex and time. Our findings demonstrate that faecal analyses are more valuable than plasma analyses for monitoring AR exposure of domestic and wild animals, even if faecal concentrations cannot be correlated with liver concentrations.
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Affiliation(s)
- Antoine Rached
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France; Liphatech, Bonnel, 47480 Pont du Casse, France
| | - Tarek Mahjoub
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France; Biochemistry, University of Manouba, National School of Veterinary Medicine of Sidi Thabet, Sidi Thabet, Tunisia
| | - Ambre Fafournoux
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Brigitte Barbier
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Isabelle Fourel
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | | | - Sébastien Lefebvre
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France.
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7
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Fernandez-de-Simon J, Díaz-Ruiz F, Jareño D, Domínguez JC, Lima-Barbero JF, de Diego N, Santamaría AE, Herrero-Villar M, Camarero PR, Olea PP, García JT, Mateo R, Viñuela J. Weasel exposure to the anticoagulant rodenticide bromadiolone in agrarian landscapes of southwestern Europe. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:155914. [PMID: 35569667 DOI: 10.1016/j.scitotenv.2022.155914] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 05/05/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Bromadiolone is an anticoagulant rodenticide (AR) commonly used as a plant protection product (PPP) against rodent pests in agricultural lands. ARs can be transferred trophically to predators/scavengers when they consume intoxicated live or dead rodents. ARs exposure in weasels Mustela nivalis, small mustelids specialized on rodent predation, is poorly known in southern Europe. Moreover, in this species there is no information on bioaccumulation of AR diastereomers e.g., cis- and trans-bromadiolone. Trans-bromadiolone is more persistent in the rodent liver and thus, is expected to have a greater probability of trophic transfer to predators. Here, we report on bromadiolone occurrence, total concentrations and diastereomers proportions (trans- and cis-bromadiolone) in weasels from Castilla y León (north-western Spain) collected in 2010-2017, where bromadiolone was irregularly applied to control outbreaks of common voles Microtus arvalis mainly with cereal grain bait distributed by the regional government. We also tested variables possibly associated with bromadiolone occurrence and concentration, such as individual features (e.g., sex), spatio-temporal variables (e.g., year), and exposure risk (e.g., vole outbreaks). Overall bromadiolone occurrence in weasels was 22% (n = 32, arithmetic mean of concentration of bromadiolone positives = 0.072 mg/kg). An individual showed signs of bromadiolone intoxication (i.e., evidence of macroscopic hemorrhages or hyperaemia and hepatic bromadiolone concentration > 0.1 mg/kg). All the exposed weasels (n = 7) showed only trans-bromadiolone diastereomer in liver, whilst a single analyzed bait from those applied in Castilla y León contained trans- and cis-bromadiolone at 65/35%. Bromadiolone occurrence and concentration in weasels varied yearly. Occurrence was higher in 2012 (100% of weasels), when bromadiolone was widely distributed, compared to 2016-2017 (2016: 20%; 2017: 8.33%) when bromadiolone was exceptionally permitted. The highest concentrations happened in 2014 and 2017, both years with vole outbreaks. Our findings indicate that specialist rodent predators could be exposed to bromadiolone in areas and periods with bromadiolone treatments against vole outbreaks.
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Affiliation(s)
- Javier Fernandez-de-Simon
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain; DITEG Research Group, Facultad de Ciencias Ambientales y Bioquímica, Universidad de Castilla-La Mancha, Avenida de Carlos III s/n., 45071 Toledo, Spain.
| | - Francisco Díaz-Ruiz
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain; Biogeography, Diversity, and Conservation Research Team, Dept. Biología Animal, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
| | - Daniel Jareño
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Julio C Domínguez
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - José F Lima-Barbero
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain; Sabiotec, Camino de Moledores s/n., 13071 Ciudad Real, Spain
| | - Noelia de Diego
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Ana E Santamaría
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain; Terrestrial Ecology Group (TEG), Departamento de Ecología, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Darwin 2, 28049 Madrid, Spain
| | - Marta Herrero-Villar
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Pablo R Camarero
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Pedro P Olea
- Terrestrial Ecology Group (TEG), Departamento de Ecología, Facultad de Ciencias, Universidad Autónoma de Madrid, C/Darwin 2, 28049 Madrid, Spain; Centro de Investigación en Biodiversidad y Cambio Global (CIBC-UAM), Univ. Autónoma de Madrid, Madrid, Spain
| | - Jesús T García
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Rafael Mateo
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
| | - Javier Viñuela
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC-UCLM-JCCM), Ronda de Toledo 12, 13071 Ciudad Real, Spain
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Ravindran S, Noor HM, Salim H. Anticoagulant rodenticide use in oil palm plantations in Southeast Asia and hazard assessment to non-target animals. ECOTOXICOLOGY (LONDON, ENGLAND) 2022; 31:976-997. [PMID: 35699849 DOI: 10.1007/s10646-022-02559-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
Anticoagulant rodenticides (ARs) are used worldwide for the control of rodent pests and are the main method of control of rat pest populations in agricultural areas. The main aim of this review is to discuss the risk of ARs to non-target wildlife in oil palm areas in Southeast Asia, mainly Indonesia and Malaysia. We discussed AR use in oil palm areas and toxicities of ARs on target and non-target animals. We also reviewed published literature on wildlife species reported in oil palm areas in Southeast Asia and utilizing this information, we assessed the hazard risk of ARs to non-target wildlife in oil palm plantations. ARs are a secondary exposure hazard to rodent-consuming mammalian carnivores, such as leopard cats and civets, and rodent-consuming raptors, such as barn owls. Consumption of dead poisoned prey puts scavengers, such as water monitors, at high risk for AR exposure. Domestic livestock and granivorous birds are at high risk for AR exposure via primary exposure to toxic bait, while omnivores such as macaques and wild pigs are at moderate risk for both primary and secondary exposure to ARs. The effects of ARs on barn owls have been well studied in the field and in laboratory secondary toxicity studies. Thus, the nest-box occupancy and reproductive parameters of local barn owl populations can be monitored as an indicator of the AR exposure level in the area. CLINICAL TRIALS REGISTRATION: No clinical trials were involved in this study.
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Affiliation(s)
- Shakinah Ravindran
- Barn Owl and Rodent Research Group (BORG), School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Hafidzi Mohd Noor
- Plant Protection Department, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Hasber Salim
- Barn Owl and Rodent Research Group (BORG), School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
- Vector Control and Research Unit, School of Biological Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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9
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Enantiomer fraction evaluation of the four stereoisomers of second-generation anticoagulant rodenticides in biological matrices with polysaccharide-based chiral selectors and liquid chromatography tandem mass spectrometry. J Chromatogr A 2022; 1676:463209. [PMID: 35717864 DOI: 10.1016/j.chroma.2022.463209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 05/31/2022] [Accepted: 06/08/2022] [Indexed: 11/20/2022]
Abstract
Numerous cases of wildlife exposure to five second-generation anticoagulant rodenticides have been reported worldwide, and residues of these chiral pesticides in biological matrices are still quantified by achiral liquid chromatography methods. However, they are a mixture of cis- and trans-diastereomers, thus a mixture of four stereoisomers. Their persistence must be evaluated in a differentiated way in the food chain of concerned predator species in order to reduce the environmental impact. This article presents an evaluation of the chiral selectivity of five polysaccharide-based chiral selectors for the four stereoisomers of bromadiolone, difenacoum, brodifacoum, flocoumafen and difethialone. Different chromatographic parameters, influencing the chiral separation, such as organic modifier (acetonitrile, methanol), percentage of formic acid and water content in the mobile phase are systematically tested for all columns. It was shown that little amount of water added to the acetonitrile mobile phase may influence the retention behaviors between reversed phase and HILIC-like modes, and consequently the enantiomer elution order of the four stereoisomers. On the contrary, reversed phase is always the observed mode for the methanol water mobile phase. A suitable combination of all these parameters is presented for each second-generation anticoagulant rodenticide with a description of the enantioresolution, the enantiomer elution order and the retention times of the respective stereoisomers. A method is validated for all stereoisomers of each second-generation anticoagulant rodenticide with chicken liver and according to an official bioanalytical guideline. As an example, the enantiomer fraction is evaluated in the liver of a raptor species (rodent predator) exposed to bromadiolone and difenacoum. The results showed that only one enantiomer of trans-bromadiolone and one enantiomer of cis-difenacoum is present in hepatic residues, although all four stereoisomers are present in bromadiolone and difenacoum rodenticide baits.
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10
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Mahjoub T, Krafft E, Garnier L, Mignard A, Hugnet C, Lefebvre S, Fourel I, Benoit E, Lattard V. Asymptomatic Anticoagulant Rodenticide Exposure in Dogs and Cats—A French and Belgian Rural and Urban Areas Study. FRONTIERS IN TOXICOLOGY 2022; 4:907892. [PMID: 35647575 PMCID: PMC9131000 DOI: 10.3389/ftox.2022.907892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/25/2022] [Indexed: 11/13/2022] Open
Abstract
Anticoagulant rodenticides (ARs) are important tools for controlling rodent pests, but they also pose a health threat to non-target species. ARs are one of the most common causes of pet poisoning. However, exposure of domestic animals to subclinical doses of ARs is poorly documented. To study the random exposure of dogs and cats to ARs, feces from animals showing no clinical signs of rodenticide poisoning were collected from a network of French and Belgian veterinarians. We analyzed fresh feces from 304 dogs and 289 cats by liquid chromatography-tandem mass spectrometry. This study showed a limited prevalence of AR exposure in dogs and cats of 2.6 and 4.5% respectively. In both species, access to the outdoors is a risk factor for ARs exposure. In contrast, the sex of the animals did not affect the ARs exposure status. The observation of the ratio of cis and trans isomers suggested primary exposure in dogs, but also in some cats. While primary exposure in dogs appears to be related to the use of ARs as plant protection products, primary exposure in cats may be malicious, as warfarin, an anticoagulant formerly used as a rodenticide and now used only in humans, was found in 4 of 13 exposed cats. Secondary exposure may also occur in cats.Our study showed reduced exposure in dogs and cats, compared to wildlife, which often has high exposure, especially in areas where rodent control is important.
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Affiliation(s)
- Tarek Mahjoub
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
- Biochemistry, University of Manouba, National School of Veterinary Medicine of Sidi Thabet, Ariana, Tunisia
| | - Emilie Krafft
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
| | - Léa Garnier
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
| | - Amélie Mignard
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
| | | | | | - Isabelle Fourel
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
| | - Etienne Benoit
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
| | - Virginie Lattard
- USC1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, Lyon, France
- *Correspondence: Virginie Lattard,
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11
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Mercer MA, Davis JL, Riviere JE, Baynes RE, Tell LA, Jaberi-Douraki M, Maunsell FP, Lin Z. Mechanisms of toxicity and residue considerations of rodenticide exposure in food Animals—a FARAD perspective. J Am Vet Med Assoc 2022; 260:514-523. [DOI: 10.2460/javma.21.08.0364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Melissa A. Mercer
- 1Food Animal Residue Avoidance and Databank Program (FARAD), Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
| | - Jennifer L. Davis
- 1Food Animal Residue Avoidance and Databank Program (FARAD), Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA
| | - Jim E. Riviere
- 2FARAD, Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
- 3FARAD, 1DATA Consortium and Department of Mathematics, College of Arts and Sciences, Kansas State University-Olathe, Olathe, KS
| | - Ronald E. Baynes
- 2FARAD, Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
| | - Lisa A. Tell
- 4FARAD, Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California-Davis, Davis, CA
| | - Majid Jaberi-Douraki
- 3FARAD, 1DATA Consortium and Department of Mathematics, College of Arts and Sciences, Kansas State University-Olathe, Olathe, KS
| | - Fiona P. Maunsell
- 5FARAD, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL
| | - Zhoumeng Lin
- 6FARAD, Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida, Gainesville, FL
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Rached A, Lattard V, Fafournoux A, Caruel H, Fourel I, Benoit E, Lefebvre S. Comparative pharmacokinetics of difethialone stereoisomers in male and female rats and mice: development of an intra- and inter-species model to predict the suitable formulation mix. Arch Toxicol 2022; 96:535-544. [DOI: 10.1007/s00204-021-03210-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/14/2021] [Indexed: 12/17/2022]
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Suljević D, Ibragić S, Mitrašinović-Brulić M, Fočak M. Evaluating the effects of anticoagulant rodenticide bromadiolone in Wistar rats co-exposed to vitamin K: impact on blood-liver axis and brain oxidative status. Mol Cell Biochem 2021; 477:525-536. [PMID: 34816338 DOI: 10.1007/s11010-021-04303-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 11/17/2021] [Indexed: 10/19/2022]
Abstract
The aim of this study was to investigate the beneficial effects of vitamin K relate to protection against detrimental effects of bromadiolone. Wistar rats (n = 30) were divided in three groups (n = 10): control group and two groups treated with bromadiolone (0.12 mg/kg) and bromadiolone + vitamin K (0.12 mg/kg + 100 mg/kg) over the period of four days. The main findings in the bromadiolone-exposed rats, such as damaged hepatocytes, high levels of globulin, total proteins and lymphocytes, and altered albumin/globulin ratio, collectively indicate an acute inflammatory process. Morphological changes in erythrocytes include microcytosis, hypochromia, hyperchromia, hemolysis, stomatocytosis, and spherocytosis. Significantly low values of RBC, Hct, and hemoglobin concentrations indicate impairments of the hematopoietic pathway causing combined anemia. The selected dose of bromadiolone caused a non-significant increase of catalase activity and a significant increase of the total protein content in brain tissue homogenates. Vitamin K supplementation reduced many of the harmful effects of bromadiolone. The cytoprotective role of vitamin K was proved to be of great importance for the preservation of structural changes on the membranes of hepatocytes and erythrocytes, in addition to the known role in the treatment of coagulopathies. The results of the study suggest valuable properties of vitamin K in the prevention and treatment of various types of anemia caused by bromadiolone toxicity. Future research is necessary to determine the adequate dose and treatment duration with vitamin K in disorders caused by the cumulative action of bromadiolone and possibly other pesticides.
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Affiliation(s)
- Damir Suljević
- Faculty of Science, Department of Biology, University of Sarajevo, Sarajevo, Bosnia and Herzegovina.
| | - Saida Ibragić
- Faculty of Science, Department of Chemistry, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
| | - Maja Mitrašinović-Brulić
- Faculty of Science, Department of Biology, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
| | - Muhamed Fočak
- Faculty of Science, Department of Biology, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
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14
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Abi Khalil R, Barbier B, Fafournoux A, Mahamat AB, Marquez A, Poissenot K, Keller M, Desvars-Larrive A, Fernandez-De-Simon J, Coeurdassier M, Benoit E, Lefebvre S, Pinot A, Lattard V. Seasonal diet-based resistance to anticoagulant rodenticides in the fossorial water vole (Arvicola amphibius). ENVIRONMENTAL RESEARCH 2021; 200:111422. [PMID: 34062198 DOI: 10.1016/j.envres.2021.111422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/23/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
Anticoagulant rodenticides (AR) resistance has been defined as "a major loss of efficacy due to the presence of a strain of rodent with a heritable and commensurately reduced sensitivity to the anticoagulant". The mechanism that supports this resistance has been identified as based on mutations in the Vkorc1 gene leading to severe resistance in rats and mice. This study evaluates the validity of this definition in the fossorial water vole and explores the possibility of a non-genetic diet-based resistance in a strict herbivorous rodent species. Genetic support was explored by sequencing the Vkorc1 gene and the diet-based resistance was explored by the dosing of vitamins K in liver of voles according to seasons. From a sample of 300 voles, only 2 coding mutations, G71R and S149I, were detected in the Vkorc1 gene in the heterozygous state with low allele frequencies (0.5-1%). These mutations did not modify the sensitivity to AR, suggesting an absence of genetic Vkorc1-based resistance in the water vole. On the contrary, vitamin K1 was shown to be 5 times more abundant in the liver of the water vole compared to rats. This liver concentration was shown to seasonally vary, with a trough in late winter and a peak in late spring/early summer related to the growth profile of grass. This increase in concentration might be responsible for the increased resistance of water voles to AR. This study highlights a non-genetic, diet-related resistance mechanism in rodents to AR. This diet-based resistance might explain the different evolution of the Vkorc1 gene in the fossorial water vole compared to rats and mice.
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Affiliation(s)
- Rami Abi Khalil
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Brigitte Barbier
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Ambre Fafournoux
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Ali Barka Mahamat
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Aurélie Marquez
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Kevin Poissenot
- INRAe, CNRS, IFCE, Univ. Tours, Physiologie de la Reproduction et des Comportements, F-37380, Nouzilly, France
| | - Matthieu Keller
- INRAe, CNRS, IFCE, Univ. Tours, Physiologie de la Reproduction et des Comportements, F-37380, Nouzilly, France
| | - Amélie Desvars-Larrive
- Unit of Veterinary Public Health and Epidemiology, University of Veterinary Medicine, Vienna, Austria; Complexity Science Hub Vienna, Austria
| | | | - Michael Coeurdassier
- Chrono-Environnement Université de Bourgogne Franche-Comté/CNRS usc INRAe Besançon Cedex, France
| | - Etienne Benoit
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Sébastien Lefebvre
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Adrien Pinot
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRAe, VetAgro Sup, University of Lyon, F-69280, Marcy l'Etoile, France.
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15
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Fourel I, Couzi FX, Lattard V. Monitoring the hepatic residues of cis- and trans-diastereoisomers of second generation anticoagulant rodenticides reveals a different bioaccumulation of diastereoisomers in the food chain of the Réunion harrier (Circus maillardi). THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 779:146287. [PMID: 33752022 DOI: 10.1016/j.scitotenv.2021.146287] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 03/01/2021] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
The Réunion harrier is an endangered raptor and endemic species to the Réunion Island. Second generation anticoagulant rodenticides (SGARs) are widely used pesticides on the island in order to control rodent populations. The latter are responsible for the transmission of leptospirosis to humans, the damage of sugarcane crops, and the decline of endemic endangered birds. SGARs are very persistent chiral pesticides and consequent secondary exposure or poisoning of the Réunion harrier has been observed (73% of prevalence in a group of 58 harriers). Commercial formulations of SGARs are a mixture of trans- and cis-diastereoisomers. Both diastereoisomers of all SGARs have been shown to inhibit coagulation function with the same potency. On the other hand, they have been shown to have a significant difference in terms of tissue-persistence. This difference has led to residue levels in rats with a significantly lower proportion of one of the isomers compared to the bait composition. In this study, residue levels of the diastereoisomers of all SGARs were evaluated in the livers of 58 harrier carcasses. The respective concentrations and proportions of cis- and trans- diastereoisomers of all SGARs are presented. cis-Brodifacoum and trans-bromadiolone had the highest concentrations (up to 438 and 573 ng/g ww respectively), while trans-brodifacoum was less than 46 ng/g and cis-bromadiolone was barely detected. cis-Difenacoum showed the highest prevalence and the highest concentration was 82 ng/g ww, while trans-difenacoum was never detected. This study demonstrated that only cis-brodifacoum and trans-bromadiolone (and cis-difethialone, but with a low prevalence) had hepatic concentrations above a toxic threshold. The cis- and trans-diastereoisomers of SGARs had differential bioaccumulation in the food chain of the Réunion harrier compared to commercial baits. This suggests that a change of the proportions of SGARs diastereoisomers in baits could reduce the risk of secondary poisoning of predators, but maintain primary toxicity.
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Affiliation(s)
- Isabelle Fourel
- USC 1233 RS2GP, INRAe, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France.
| | | | - Virginie Lattard
- USC 1233 RS2GP, INRAe, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
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16
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Valverde I, Espín S, Gómez-Ramírez P, Navas I, María-Mojica P, Sánchez-Virosta P, Jiménez P, Torres-Chaparro MY, García-Fernández AJ. Wildlife poisoning: a novel scoring system and review of analytical methods for anticoagulant rodenticide determination. ECOTOXICOLOGY (LONDON, ENGLAND) 2021; 30:767-782. [PMID: 33864551 DOI: 10.1007/s10646-021-02411-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/30/2021] [Indexed: 05/10/2023]
Abstract
Anticoagulant rodenticides (ARs) are commonly used to control rodent populations and frequently involved in wildlife and domestic animal poisoning. These poisoning cases (especially for ARs) are a challenge for forensic toxicologists, and adequate post-mortem examination and toxicological analyses become essential for a proper diagnosis. Publications describing different analytical methods for AR analysis in biological samples are growing, and a clear compilation of the overall picture is needed to standardize methodologies in future research. This review aims to compile and compare the analytical procedures applied for AR determination in the literature. Using this information, a scoring system was developed for those techniques using liver and blood as matrices, and the techniques were ranked considering different criteria (i.e. sample amount required, recoveries, limits of quantification (LOQs), number of ARs analysed, points of the calibration curve and multi-class methods). This review shows an overview of the main methods used for AR analysis in forensic toxicology and will help to elucidate future directions to improve multi-residue techniques to detect the ARs involved in wildlife lethal poisoning.
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Affiliation(s)
- Irene Valverde
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
| | - Silvia Espín
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain.
- Toxicology and Risk Assessment Group, Biomedical Research Institute of Murcia (IMIB-Arrixaca), University of Murcia, Campus de Espinardo, Murcia, Spain.
| | - Pilar Gómez-Ramírez
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
- Toxicology and Risk Assessment Group, Biomedical Research Institute of Murcia (IMIB-Arrixaca), University of Murcia, Campus de Espinardo, Murcia, Spain
| | - Isabel Navas
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
- Toxicology and Risk Assessment Group, Biomedical Research Institute of Murcia (IMIB-Arrixaca), University of Murcia, Campus de Espinardo, Murcia, Spain
| | - Pedro María-Mojica
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
- "Santa Faz" Wildlife Rehabilitation Center, Consellería de Agricultura, Medio Ambiente, Cambio Climático y Desarrollo Rural, Alicante, Generalitat Valenciana, Spain
| | - Pablo Sánchez-Virosta
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
| | - Pedro Jiménez
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
| | - María Y Torres-Chaparro
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain
| | - Antonio J García-Fernández
- Toxicology and Forensic Veterinary Service, Faculty of Veterinary, University of Murcia, Campus de Espinardo, Murcia, Spain.
- Toxicology and Risk Assessment Group, Biomedical Research Institute of Murcia (IMIB-Arrixaca), University of Murcia, Campus de Espinardo, Murcia, Spain.
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Nosal DG, Feinstein DL, van Breemen RB. Chiral liquid chromatography-tandem mass spectrometry analysis of superwarfarin rodenticide stereoisomers - Bromadiolone, difenacoum and brodifacoum - In human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1165:122529. [PMID: 33486217 PMCID: PMC7875153 DOI: 10.1016/j.jchromb.2021.122529] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 12/28/2020] [Accepted: 01/02/2021] [Indexed: 01/08/2023]
Abstract
Superwarfarins are second-generation long-acting anticoagulant rodenticides that can cause unintended human and wildlife toxicity due, in part, to their prolonged half-lives. Commercially available superwarfarin rodenticides are synthesized as racemates with two asymmetric carbons, producing four stereoisomers. To support studies of human plasma half-lives of individual superwarfarin stereoisomers, a method was developed based on LC-MS/MS to separate and quantify stereoisomers of the commercially important superwarfarins bromadiolone, difenacoum and brodifacoum. Human plasma samples were prepared using protein precipitation and centrifugation. Chiral-phase HPLC separation was carried out on-line with tandem mass spectrometric quantitative analysis of the eluting stereoisomers using selected-reaction monitoring with positive ion electrospray on a triple quadrupole mass spectrometer. All four stereoisomers of each superwarfarin were resolved within 12.5 min with calibration curves spanning 2-3 orders of magnitude and lower limits of quantitation between 0.87 and 2.55 ng/mL. This method was used to determine the half-lives of superwarfarin stereoisomers in plasma from patients who had inhaled synthetic cannabinoid products contaminated with superwarfarins. These data may be used to guide the development of safer next generation anticoagulant rodenticides stereoisomers.
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Affiliation(s)
- Daniel G Nosal
- Linus Pauling Institute, Department of Pharmaceutical Sciences, Oregon State University 2900 SW Campus Way, Corvallis, OR 97331, USA
| | - Douglas L Feinstein
- Department of Anesthesiology, University of Illinois at Chicago, 835 South Wolcott Ave, MC513, E720, Chicago, IL 60612, USA
| | - Richard B van Breemen
- Linus Pauling Institute, Department of Pharmaceutical Sciences, Oregon State University 2900 SW Campus Way, Corvallis, OR 97331, USA.
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Abi Khalil R, Barbier B, Rached A, Benoit E, Pinot A, Lattard V. Water vole management - Could anticoagulant rodenticides stereochemistry mitigate the ecotoxicity issues associated to their use? ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 81:103536. [PMID: 33130091 DOI: 10.1016/j.etap.2020.103536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 10/21/2020] [Accepted: 10/25/2020] [Indexed: 06/11/2023]
Abstract
Cyclic water vole population explosions can be controlled in some European countries with anticoagulant rodenticides leading sometimes to wildlife poisonings due to the toxin's tissue persistence. Here, we analyzed the pharmacokinetics of rodenticide residues in voles and we explored potential ways of improving the mass application of these agents based on the concept of stereoisomers. We demonstrated the dramatic persistence of bromadiolone in vole tissues with a hepatic half-life of about 10-30 days, while the tissue persistence of chlorophacinone is rather short with a hepatic half-life of about one day. The dramatic persistence of bromadiolone is due to the trans-isomer group (the major compound in bromadiolone), while the cis-isomer group has a short half-life. Because of resistance to chlorophacinone, the cis-bromadiolone isomers may constitute an excellent compromise between efficacy and ecotoxicological risk to control voles. A mathematical model is proposed to favor the development of baits mixed with cis-isomer groups.
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Affiliation(s)
- Rami Abi Khalil
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Brigitte Barbier
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Antoine Rached
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Etienne Benoit
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Adrien Pinot
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRAE, VetAgro Sup, University of Lyon, F-69280 Marcy l'Etoile, France.
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19
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Rached A, Moriceau MA, Serfaty X, Lefebvre S, Lattard V. Biomarkers Potency to Monitor Non-target Fauna Poisoning by Anticoagulant Rodenticides. Front Vet Sci 2020; 7:616276. [PMID: 33426034 PMCID: PMC7785832 DOI: 10.3389/fvets.2020.616276] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 11/30/2020] [Indexed: 12/11/2022] Open
Abstract
The widespread use of pesticides to control agricultural pests is a hot topic on the public scene of environmental health. Selective pest control for minimum environmental impact is a major goal of the environmental toxicology field, notably to avoid unintended poisoning in different organisms. Anticoagulant rodenticides cause abnormal blood coagulation process; they have been widely used to control rodents, allowing inadvertent primary and secondary exposure in domestic animals and non-target predatory wildlife species through direct ingestion of rodenticide-containing bait or by consumption of poisoned prey. To report toxic effect, the most common approach is the measurement of liver or plasma residues of anticoagulant rodenticides in dead or intoxicated animals showing clinical symptoms. However, one major challenge is that literature currently lacks a hepatic or plasma concentration threshold value for the differentiation of exposure from toxicity. Regarding the variation in pharmacology properties of anticoagulant rodenticides inter- and intra-species, the dose-response relationship must be defined for each species to prejudge the relative risk of poisoning. Beyond that, biomarkers are a key solution widely used for ecological risk assessment of contaminants. Since anticoagulant rodenticides (AR) have toxic effects at the biochemical level, biomarkers can serve as indicators of toxic exposure. In this sense, toxicological knowledge of anticoagulant rodenticides within organisms is an important tool for defining sensitive, specific, and suitable biomarkers. In this review, we provide an overview of the toxicodynamic and toxicokinetic parameters of anticoagulant rodenticides in different animal species. We examine different types of biomarkers used to characterize and differentiate the exposure and toxic effects of anticoagulant rodenticide, showing the strengths and weaknesses of the assays. Finally, we describe possible new biomarkers and highlight their capabilities.
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Affiliation(s)
| | | | | | | | - Virginie Lattard
- USC 1233 RS2GP, VetAgro Sup, INRA, University of Lyon, Marcy l'Etoile, France
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Fourel I, Berlioz-Barbier A, Benoit E. Mass spectrometry characterization of anticoagulant rodenticides and hydroxyl metabolites. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8871. [PMID: 32585774 DOI: 10.1002/rcm.8871] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 06/04/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Anticoagulant rodenticides (ARs) are used worldwide for rodent population control to protect human health and biodiversity, and to prevent agricultural and economic losses. Rodents may develop a metabolic resistance to ARs. In order to help understand such metabolic resistance, mass spectrometry was used to position the hydroxylated group of hydroxyl metabolites of second-generation ARs (SGARs). METHODS Most AR pesticides are derived from the 4-hydroxycoumarin/thiocoumarin family. We used low-resolution and high-resolution mass spectrometry to understand the fragmentation pathways of the ARs and their respective metabolites, and to better define the structure of their tandem mass spectrometry product ions. RESULTS Seven specific product ions were evidenced for five ARs, with their respective chemical structures. Those ions were obtained as well from the mass spectra of the hydroxyl metabolites of four SGARs, difenacoum (DFM), brodifacoum (BFM), difethialone (DFTL) and flocoumafen (FLO), with different positions of the hydroxyl group. CONCLUSIONS The differences in chemical structure between DFM on the one hand and BFM, FLO and DFTL on the other could explain the differences in bioavailability between these two groups of molecules. The defined product ions will be used to investigate the part played by the metabolic issue in the field resistance of SGARs.
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Affiliation(s)
- Isabelle Fourel
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, Marcy l'Etoile, F-69280, France
| | | | - Etienne Benoit
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, Marcy l'Etoile, F-69280, France
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Alabau E, Mentaberre G, Camarero PR, Castillo-Contreras R, Sánchez-Barbudo IS, Conejero C, Fernández-Bocharán MS, López-Olvera JR, Mateo R. Accumulation of diastereomers of anticoagulant rodenticides in wild boar from suburban areas: Implications for human consumers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 738:139828. [PMID: 32534275 DOI: 10.1016/j.scitotenv.2020.139828] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 05/27/2020] [Accepted: 05/28/2020] [Indexed: 06/11/2023]
Abstract
We studied the prevalence of anticoagulant rodenticides (ARs) in liver and muscle tissues of wild boar captured in the urban area of Barcelona, the suburban area of Collserola Natural Park and the rural area of Santa Quiteria, next to Cabañeros National Park, in Spain. The objective was to assess the influence of both urbanisation and wild boar (Sus scrofa) trophic opportunism on the accumulation of these compounds. We have also evaluated the risk for human consumers of this game meat. Wild boars from Barcelona city showed the highest prevalence of ARs detection (60.8%), followed by the adjoining suburban area of Collserola N.P. (40%) and the rural distant area of Santa Quiteria (7.7%). Liver bioaccumulated ARs (45.2%) more frequently than muscle (11.9%). A significant proportion (13.7%) of wild boar captured in Barcelona city exceeded 200 ng/g of total ARs in liver, a threshold for adverse effects on blood clotting. For difenacoum, there was a predominance of cis isomer, while for brodifacoum and bromadiolone cis and trans isomers appeared in a similar proportion. According to the scarce available information on ARs toxicity in humans, the risk of acute poisoning from game meat consumption seems to be low. However, repeated exposure through liver consumption should be considered in further risk assessments because of the high concentration detected in some samples (up to 0.68 mg/kg).
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Affiliation(s)
- Enrique Alabau
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC, UCLM, JCCM), Ronda de Toledo 12, 13005 Ciudad Real, Spain
| | - Gregorio Mentaberre
- Wildlife Ecology & Health Group (WE&H) and Servicio de Ecopatologia de Fauna Salvaje (SEFaS), Universitat Autònoma de Barcelona (UAB), Bellaterra, 08193 Barcelona, Spain; Serra Hunter Fellow, Wildlife Ecology & Health group (WE&H) and Departamento de Ciencia Animal, Escuela Técnica Superior de Ingeniería Agraria, Universidad de Lleida, 25198 Lleida, Spain
| | - Pablo R Camarero
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC, UCLM, JCCM), Ronda de Toledo 12, 13005 Ciudad Real, Spain
| | - Raquel Castillo-Contreras
- Wildlife Ecology & Health Group (WE&H) and Servicio de Ecopatologia de Fauna Salvaje (SEFaS), Universitat Autònoma de Barcelona (UAB), Bellaterra, 08193 Barcelona, Spain
| | - Inés S Sánchez-Barbudo
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC, UCLM, JCCM), Ronda de Toledo 12, 13005 Ciudad Real, Spain
| | - Carles Conejero
- Wildlife Ecology & Health Group (WE&H) and Servicio de Ecopatologia de Fauna Salvaje (SEFaS), Universitat Autònoma de Barcelona (UAB), Bellaterra, 08193 Barcelona, Spain
| | - María S Fernández-Bocharán
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC, UCLM, JCCM), Ronda de Toledo 12, 13005 Ciudad Real, Spain
| | - Jorge R López-Olvera
- Wildlife Ecology & Health Group (WE&H) and Servicio de Ecopatologia de Fauna Salvaje (SEFaS), Universitat Autònoma de Barcelona (UAB), Bellaterra, 08193 Barcelona, Spain
| | - Rafael Mateo
- Instituto de Investigación en Recursos Cinegéticos, IREC (CSIC, UCLM, JCCM), Ronda de Toledo 12, 13005 Ciudad Real, Spain.
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Feinstein DL, Nosal DG, Ramanathan S, Zhou J, Chen L, Hershow RC, van Breemen RB, Wright E, Hafner JW, Rubinstein I. Effects of vitamin K1 treatment on plasma concentrations of long-acting anticoagulant rodenticide enantiomers following inhalation of contaminated synthetic cannabinoids. Clin Toxicol (Phila) 2020; 58:716-724. [PMID: 31736367 PMCID: PMC7583456 DOI: 10.1080/15563650.2019.1687903] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 10/21/2019] [Accepted: 10/25/2019] [Indexed: 12/30/2022]
Abstract
Background: An outbreak of synthetic cannabinoid (SC)-associated coagulopathy and bleeding in Illinois, USA was determined to be due to inhalation of SC contaminated with brodifacoum (BDF), difenacoum (DiF), and bromadiolone (BDL), highly potent long-acting anticoagulant rodenticides (LAARs). Treatment with high-dose vitamin K1 (VK1) prevented mortality; however, plasma LAAR levels were not measured risking recurrence of coagulopathy and bleeding due to premature discontinuation. The goal of this study was to determine if plasma LAAR levels were reduced following standard of care treatment to normalize coagulopathy.Methods: Blood samples were collected from a cohort of 32 patients, and ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis used to quantify plasma LAAR levels including enantiomers.Results: BDF was detected in 31 samples; 30 also contained DiF and 18 contained BDL. Initial plasma levels were 581 ± 87, 11.0 ± 1.9, and 14.9 ± 5.9 ng/mL for BDF, DiF, and BDL, respectively (mean ± SE). At discharge plasma, BDF levels remained elevated at 453 ± 68 ng/mL. Plasma half-lives for BDF, DiF, and BDL were 7.5 ± 1.3, 7.2 ± 1.9, and 1.8 ± 0.3 days, respectively. The half-life for trans-BDF enantiomers (5.7 ± 0.8 days) was shorter than for cis-enantiomers (7.6 ± 1.9 days). BDF half-lives were shorter, and coagulopathy normalized faster in patients receiving intravenous VK1 as compared to oral VK1. Patients prescribed VK1 at discharge had fewer re-admittances.Conclusions: These results demonstrate that plasma LAAR levels at discharge were elevated in poisoned patients despite normal coagulation, and that the route of VK1 administration affected LAAR pharmacokinetics and INR normalization. We propose plasma LAAR levels and coagulation be monitored concomitantly during follow-up of patients with LAAR poisoning. KEY POINTSIn patients treated with high-dose vitamin K1 for LAAR poisoning, plasma levels remained 40-fold above safe levels upon discharge from hospital.LAAR half-lives, normalization of coagulopathy, and readmittances were reduced by treatment with intravenous vitamin K1.
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Affiliation(s)
- Douglas L Feinstein
- Jesse Brown VA Medical Center, Chicago, IL, USA
- Department of Anesthesiology, University of Illinois, Chicago, IL, USA
| | - Daniel G Nosal
- Linus Pauling Institute, Oregon State University, Corvallis, OR, USA
| | - Swetha Ramanathan
- Division of Epidemiology and Biostatistics, University of Illinois, Chicago, IL, USA
| | - Jifang Zhou
- College of Pharmacy, University of Illinois, Chicago, IL, USA
| | - Luying Chen
- Linus Pauling Institute, Oregon State University, Corvallis, OR, USA
| | - Ronald C Hershow
- Division of Epidemiology and Biostatistics, University of Illinois, Chicago, IL, USA
| | | | - Erik Wright
- Department of Emergency Medicine, University of Illinois, Peoria, IL, USA
| | - John W Hafner
- Department of Emergency Medicine, University of Illinois, Peoria, IL, USA
| | - Israel Rubinstein
- Jesse Brown VA Medical Center, Chicago, IL, USA
- Department of Medicine, University of Illinois, Chicago, IL, USA
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Sjodin BMF, Irvine RL, Russello MA. RapidRat: Development, validation and application of a genotyping-by-sequencing panel for rapid biosecurity and invasive species management. PLoS One 2020; 15:e0234694. [PMID: 32555734 PMCID: PMC7302687 DOI: 10.1371/journal.pone.0234694] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 05/31/2020] [Indexed: 11/19/2022] Open
Abstract
Invasive alien species (IAS) are among the main causes of global biodiversity loss. Invasive brown (Rattus norvegicus) and black (R. rattus) rats, in particular, are leading drivers of extinction on islands, especially in the case of seabirds where >50% of all extinctions have been attributed to rat predation. Eradication is the primary form of invasive rat management, yet this strategy has resulted in a ~10-38% failure rate on islands globally. Genetic tools can help inform IAS management, but such applications to date have been largely reactive, time-consuming, and costly. Here, we developed a Genotyping-in-Thousands by sequencing (GT-seq) panel for rapid species identification and population assignment of invasive brown and black rats (RapidRat) in Haida Gwaii, an archipelago comprising ~150 islands off the central coast of British Columbia, Canada. We constructed an optimized panel of 443 single nucleotide polymorphisms (SNPs) using previously generated double-digest restriction-site associated DNA (ddRAD) genotypic data (27,686 SNPs) from brown (n = 295) and black rats (n = 241) sampled throughout Haida Gwaii. The informativeness of this panel for identifying individuals to species and island of origin was validated relative to the ddRAD results; in all comparisons, admixture coefficients and population assignments estimated using RapidRat were consistent. To demonstrate application, 20 individuals from novel invasions of three islands (Agglomerate, Hotspring, Ramsay) were genotyped using RapidRat, all of which were confidently assigned (>98.5% probability) to Faraday and Murchison Islands as putative source populations. These results indicated that a previous eradication on Hotspring Island was conducted at an inappropriate geographic scale; future management should expand the eradication unit to include neighboring islands to prevent re-invasion. Overall, we demonstrated that RapidRat is an effective tool for managing invasive rat populations in Haida Gwaii and provided a clear framework for GT-seq panel development for informing biodiversity conservation in other systems.
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Affiliation(s)
- Bryson M. F. Sjodin
- Department of Biology, University of British Columbia, Kelowna, British Columbia, Canada
| | - Robyn L. Irvine
- Gwaii Haanas National Park Reserve, National Marine Conservation Area Reserve and Haida Heritage Site, Parks Canada, Skidegate, British Columbia, Canada
| | - Michael A. Russello
- Department of Biology, University of British Columbia, Kelowna, British Columbia, Canada
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Nosal DG, Feinstein DL, Chen L, van Breemen RB. Separation and Quantification of Superwarfarin Rodenticide Diastereomers-Bromadiolone, Difenacoum, Flocoumafen, Brodifacoum, and Difethialone-in Human Plasma. J AOAC Int 2020; 103:770-778. [PMID: 33241367 PMCID: PMC7372953 DOI: 10.1093/jaoacint/qsaa007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 01/06/2020] [Accepted: 01/10/2020] [Indexed: 01/15/2023]
Abstract
BACKGROUND Superwarfarins, second-generation long-acting anticoagulant rodenticides, are 4-hydroxycoumarin analogues of warfarin that contain a large hydrophobic side chain. These compounds contain two chiral centers and are synthesized for commercial use as two pairs of diastereomer. OBJECTIVE To support studies of superwarfarin pharmacokinetics and other efforts to improve clinical care for poisoning victims, a quantitative assay was developed for the measurement of diastereomer of bromadiolone, difenacoum, flocoumafen, brodifacoum, and difethialone in human plasma. METHOD Based on ultrahigh-pressure liquid chromatography-tandem mass-spectrometry (UHPLC-MS/MS), this method was validated according to U.S. Food and Drug Administration (FDA) guidelines. Sample preparation involved simple protein precipitation followed by reversed phase UHPLC, which resolved all five pairs of cis/trans diastereomer in less than 10 min. Superwarfarins were measured using negative ion electrospray followed by selected-reaction monitoring on a triple quadrupole mass spectrometer. RESULTS Calibration curves covered 3-4 orders of magnitude with linear regression coefficients of >0.999. The lower limits of quantitation were from 0.013 to 2.41 ng/mL, and intra-day and inter-day accuracy and precision coefficients of variation were <12%. CONCLUSIONS A 10-min UHPLC-MS/MS assay was developed and validated for the separation and quantitative analysis of the pairs of diastereomer of five superwarfarins in human plasma. HIGHLIGHTS This method was used to identify and measure superwarfarins and their cis/trans diastereomers in plasma obtained from patients treated for coagulopathy following consumption of contaminated synthetic cannabinoid products.
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Affiliation(s)
- Daniel G Nosal
- Oregon State University, Linus Pauling Institute, Department of Pharmaceutical Sciences, 2900 SW Campus Way, Corvallis, OR 97331, USA
| | - Douglas L Feinstein
- University of Illinois at Chicago, Department of Anesthesiology, 835 South Wolcott Ave, MC513, E720, Chicago, IL 60612, USA
| | - Luying Chen
- Oregon State University, Linus Pauling Institute, Department of Pharmaceutical Sciences, 2900 SW Campus Way, Corvallis, OR 97331, USA
| | - Richard B van Breemen
- Oregon State University, Linus Pauling Institute, Department of Pharmaceutical Sciences, 2900 SW Campus Way, Corvallis, OR 97331, USA
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Fourel I, Benoit E, Lattard V. Enantiomeric fraction evaluation of the four stereoisomers of difethialone in biological matrices of rat by two enantioselective liquid chromatography tandem mass spectrometry methods: Chiral stationary phase or derivatization. J Chromatogr A 2020; 1618:460848. [PMID: 31932088 DOI: 10.1016/j.chroma.2019.460848] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 12/26/2019] [Accepted: 12/31/2019] [Indexed: 10/25/2022]
Abstract
The need for the control of rodent populations with anticoagulant rodenticides remains actual, and enantioselective analytical methods are mandatory to understand ecotoxicity issues of those chiral pesticides. This study presents two enantioselective methods to achieve the residue levels and differentiated persistence of the four stereoisomers of difethialone (called in this work E1-trans, E2-cis, E3-cis and E4-trans), which is one of the most toxic second generation anticoagulant rodenticide. Their enantiomeric fraction evaluation in biological matrices of rats was determined by two LC-MS/MS methods. The first one (chiral-LC-MS/MS) combined a chiral column employed in reversed-phase mode (with acetonitrile-water mobile phase) to be compatible with mass spectrometry detection. The second one was also a LC-MS/MS method but with a reversed phase column after a derivatization step with (1S)-(-)-camphanic chloride. Extraction process combined Solid-Liquid extraction and sorbent cartridges. The methods were fully validated. The chiral column was chosen as a reference method for our laboratory because it was quicker and cheaper, and enantioresolution and sensitivity were better. This chiral-LC-MS/MS method was used to measure the enantiomeric fraction of the four stereoisomers of difethialone in rodent biological matrices (liver, plasma, blood and feces) of female rats treated with 3.5 mg/kg of difethialone. The results showed that metabolism is not the same for all the stereoisomers: cis-E3-difethialone was the most persistent, and E4-trans-difethialone was the most quickly eliminated. This chiral-LC-MS/MS method will be used to study the pharmacokinetics of the four stereoisomers of difethialone, and for ecotoxicological surveillance to evaluate the specific persistence of each stereoisomer of difethialone in case of secondary exposure of wildlife non-target species.
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Affiliation(s)
- Isabelle Fourel
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France.
| | - Etienne Benoit
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRA, VetAgro Sup, Univ Lyon, F-69280 Marcy l'Etoile, France
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Sjodin BMF, Irvine RL, Ford AT, Howald GR, Russello MA. Rattus population genomics across the Haida Gwaii archipelago provides a framework for guiding invasive species management. Evol Appl 2020; 13:889-904. [PMID: 32431741 PMCID: PMC7232760 DOI: 10.1111/eva.12907] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/18/2019] [Accepted: 12/05/2019] [Indexed: 11/29/2022] Open
Abstract
Invasive species have led to precipitous declines in biodiversity, especially in island systems. Brown (Rattus norvegicus) and black rats (R. rattus) are among the most invasive animals on the planet, with eradication being the primary tool for established island populations. The need for increased research for defining eradication units and monitoring outcomes has been highlighted as a means to maximize success. Haida Gwaii is an archipelago ~100 km off the northern coast of British Columbia, Canada, that hosts globally significant breeding populations of seabirds that are at risk due to invasive rats. Here, we paired sampling of brown (n = 287) and black (n = 291) rats across the Haida Gwaii archipelago with genotyping by sequencing (10,770-27,686 SNPs) to investigate patterns of population connectivity and infer levels/direction of gene flow among invasive rat populations in Haida Gwaii. We reconstructed three regional clusters for both species (north, central and south), with proximate populations within regions being largely more related than those that were more distant, consistent with predictions from island biogeography theory. Population assignment of recently detected individuals post-eradication on Faraday, Murchison and the Bischof Islands revealed all were re-invaders from Lyell Island, rather than being on-island survivors. Based on these results, we identified six eradication units constituting single or clusters of islands that would limit the potential for reinvasion, some of which will need to be combined with biosecurity measures. Overall, our results highlight the importance of targeted research prior to conducting eradications and demonstrate a framework for applying population genomics for guiding invasive species management in island systems.
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Affiliation(s)
| | - Robyn L. Irvine
- Gwaii Haanas National Park ReserveNational Marine Conservation Area Reserve and Haida Heritage SiteSkidegateBCCanada
| | - Adam T. Ford
- Department of BiologyUniversity of British ColumbiaKelownaBCCanada
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Lefebvre S, Fourel I, Chatron N, Caruel H, Benoit E, Lattard V. Comparative biological properties of the four stereoisomers of difethialone, a second-generation anticoagulant rodenticide, in rats: development of a model allowing to choose the appropriate stereoisomeric ratio. Arch Toxicol 2020; 94:795-801. [PMID: 32047980 DOI: 10.1007/s00204-020-02662-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/03/2020] [Indexed: 11/24/2022]
Abstract
The current management of rodent pest populations is based on second-generation anticoagulant rodenticides (SGAR). These molecules, of which difethialone is part, are much more efficient than the first generation. Nevertheless, this efficiency comes with a major drawback, SGARs are tissue persistent that increases the exposure of rodent predators to them. According to its chemical structure, difethialone has four stereoisomers, whose specific inhibition potency and pharmacokinetic have never been described and might be useful to design new eco-friendly rodenticides. The study aimed to investigate the ability to inhibit anticoagulant target enzyme (VKORC1) and the pharmacokinetics in rats of the four difethialone stereoisomers in rats. We show that stereoisomers are all highly efficient to inhibit VKORC1 activity, but they have distinct initial half-life with 6.0 h, 25.4 h, 69.3 h, and 82.3 h for, respectively, E4-trans, E2-cis, E1-trans, and E3-cis stereoisomer. These results open the way of the development of eco-friendly and efficient rodenticide by mixing some of these stereoisomers. Preferential incorporation of the E4-trans stereoisomer (high inhibitory VKORC1 potency, relatively shorter liver half-life) into difethialone rodenticides baits might result in a more eco-friendly product than current commercially available difethialone formulations. In addition, we put forward modelling to help design bait according to the circumstance of use (presence of non-target species, food competition, etc.) by modulating the theorical AUC and and the theorical concentration of the product at the death of the rodent pest. Thus, this modeling might allow to diminish the use of laboratory animal in assay.
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Affiliation(s)
- Sébastien Lefebvre
- USC 1233 RS2GP, INRA, VetAgro Sup, University of Lyon, 69280, Marcy l'Etoile, France
| | - Isabelle Fourel
- USC 1233 RS2GP, INRA, VetAgro Sup, University of Lyon, 69280, Marcy l'Etoile, France
| | - Nolan Chatron
- USC 1233 RS2GP, INRA, VetAgro Sup, University of Lyon, 69280, Marcy l'Etoile, France
| | | | - Etienne Benoit
- USC 1233 RS2GP, INRA, VetAgro Sup, University of Lyon, 69280, Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, INRA, VetAgro Sup, University of Lyon, 69280, Marcy l'Etoile, France.
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Modlinska K, Pisula W. The Norway rat, from an obnoxious pest to a laboratory pet. eLife 2020; 9:50651. [PMID: 31948542 PMCID: PMC6968928 DOI: 10.7554/elife.50651] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 12/11/2019] [Indexed: 12/03/2022] Open
Abstract
The laboratory rat was the first mammal domesticated for research purposes. It is descended from wild Norway rats, Rattus norvegicus, which despite their name likely originated in Asia. Exceptionally adaptable, these rodents now inhabit almost all environments on Earth, especially near human settlements where they are often seen as pests. The laboratory rat thrives in captivity, and its domestication has produced many inbred and outbred lines that are used for different purposes, including medical trials and behavioral studies. Differences between wild Norway rats and their laboratory counterparts were first noted in the early 20th century and led some researchers to later question its value as a model organism. While these views are probably unjustified, the advanced domestication of the laboratory rat does suggest that resuming studies of wild rats could benefit the wider research community.
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Affiliation(s)
- Klaudia Modlinska
- Institute of Psychology, Polish Academy of Sciences, Warszawa, Poland
| | - Wojciech Pisula
- Institute of Psychology, Polish Academy of Sciences, Warszawa, Poland
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Potential Health Risk to Humans Related to Accumulation of Brodifacoum and Bromadiolone in the Wheat Grown on Rodenticide Contaminated Soil. FOLIA VETERINARIA 2019. [DOI: 10.2478/fv-2019-0023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
The aim of this study was to determine in a model experiment the potential residues of bromadiolone and brodifacoum in the wheat grown on soil treated with these rodenticides and to compare them with the respective acceptable daily intake (ADI) in order to obtain information lacking in the scientific literature. The study focused on the level of residues of chronic rodenticides Broder G, with the active ingredient brodifacoum, and DERATION G, with the active ingredient bromadiolone, in wheat (Triticum spp.). The preparations were used in the form of granular bait. In the wheat grown on the soil treated with 100 g.m−2 of the preparation BRODER G, the brodifacoum residues ranged from 0.012 to 0.0218 mg.kg−1, while the treatment of soil with 500 g.m−2 resulted in residues ranging between 0.0344 and 0.0436 mg.kg−1. When using the preparation DE-RATION G, bromadiolone residues ranged between 0.012 and 0.018 mg.kg−1 after the treatment of soil with 100 g.m−2 and between 0.030 and 0.0428 mg.kg−1 after the treatment with 500 g.m−2. We observed that the acceptable daily intake was exceeded significantly in all of the cases and the residual levels depended on the rodenticide dose. In the case of brodifacoum, the ADI was exceeded more than 700-fold at a dose of 100 g.m−2 and more than 1400-fold at a dose of 500 g.m−2 of soil. With bromadio-lone, the ADI was exceeded 150-fold at a dose of 100 g.m−2 and more than 350-fold at a dose of 500 g.m−2. This indicates the risk to consumers from such crops.
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Lattard V, Benoit E. The stereoisomerism of second generation anticoagulant rodenticides: a way to improve this class of molecules to meet the requirements of society? PEST MANAGEMENT SCIENCE 2019; 75:887-892. [PMID: 30051584 DOI: 10.1002/ps.5155] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 07/19/2018] [Accepted: 07/24/2018] [Indexed: 06/08/2023]
Abstract
Second generation anticoagulant rodenticides (SGAR) are generally highly efficient for rodent management even towards warfarin-resistant rodents. Nevertheless, because of their long tissue-persistence, they are very associated with non-target exposure of wildlife and have been identified as 'Candidates for Substitution' by the European Union's competent authority. A promising way to reduce ecotoxicity issues associated to SGAR could be the improvement of SGAR based on their stereoisomery, and due to this improvement, positioning about SGAR might be reconsidered. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Virginie Lattard
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, Marcy l'Etoile, France
| | - Etienne Benoit
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, Marcy l'Etoile, France
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Feinstein DL, Gierzal K, Iqbal A, Kalinin S, Ripper R, Lindeblad M, Zahkarov A, Lyubimov A, van Breemen R, Weinberg G, Rubinstein I. The relative toxicity of brodifacoum enantiomers. Toxicol Lett 2019; 306:61-65. [PMID: 30779948 DOI: 10.1016/j.toxlet.2019.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 01/25/2019] [Accepted: 02/15/2019] [Indexed: 10/27/2022]
Abstract
Brodifacoum (BDF) is a potent, long-acting anticoagulant rodenticide that can cause fatal poisoning in humans. The chemical structure of BDF includes 2 chiral carbons, resulting in 2 pairs of diastereomers, BDF-cis (R/S and S/R) and BDF-trans (R/R and S/S). However, the relative potency of these molecules is not known. The purpose of this study was to compare the in vitro and in vivo toxic effects of the 2 BDF diastereomer pairs. In adult Sprague-Dawley rats BDF-cis was significantly more toxic than BDF-trans (LD50 values of 219 versus 316 μg/kg, respectively) while racemic BDF had intermediate potency (266 μg/kg). In adult New Zealand white rabbits, BDF-cis had a longer half-life than BDF-trans which could contribute to its observed increased toxicity. Lastly, BDF-cis (10 μM), but not BDF-trans, damaged cultured SH-SY5Y human neuroblastoma cells by attenuating mitochondrial reductive capacity. Taken together, these data suggest that different toxic manifestations of BDF poisoning in mammals could be attributed, in part, to differences in relative enantiomer concentrations present in racemic formulations of this commercially-available toxicant.
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Affiliation(s)
- Douglas L Feinstein
- Department of Anesthesiology, University of Illinois, Chicago, IL, 60612, USA; Jesse Brown VA Medical Center, Chicago, IL, 60612, USA.
| | - Kamil Gierzal
- Department of Anesthesiology, University of Illinois, Chicago, IL, 60612, USA.
| | - Asif Iqbal
- Department of Pharmacology, University of Illinois, Chicago, IL, 60615, USA.
| | - Sergey Kalinin
- Department of Anesthesiology, University of Illinois, Chicago, IL, 60612, USA
| | - Richard Ripper
- Department of Anesthesiology, University of Illinois, Chicago, IL, 60612, USA; Jesse Brown VA Medical Center, Chicago, IL, 60612, USA.
| | - Matthew Lindeblad
- Department of Pharmacology, University of Illinois, Chicago, IL, 60615, USA.
| | - Alexander Zahkarov
- Department of Pharmacology, University of Illinois, Chicago, IL, 60615, USA.
| | - Alexander Lyubimov
- Department of Pharmacology, University of Illinois, Chicago, IL, 60615, USA.
| | | | - Guy Weinberg
- Department of Anesthesiology, University of Illinois, Chicago, IL, 60612, USA; Jesse Brown VA Medical Center, Chicago, IL, 60612, USA.
| | - Israel Rubinstein
- Jesse Brown VA Medical Center, Chicago, IL, 60612, USA; Department of Medicine, University of Illinois, Chicago, IL, 60612, USA.
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Hecker OC, Boelhauve M, Mergenthaler M. Start-up financing of professional pest control in pig farming in North Rhine-Westphalia in Germany. Porcine Health Manag 2018; 4:22. [PMID: 30288296 PMCID: PMC6166279 DOI: 10.1186/s40813-018-0099-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 08/02/2018] [Indexed: 11/10/2022] Open
Abstract
Background Due to the risk of spreading epizootic diseases through rodents, pest control is mandatory in pig farming in European countries. However, there is limited research focused on rodent control practices, usage of anticoagulant rodenticides, and the acceptance of Pest Control Operators (PCOs) in pig farming in Germany. Therefore, the present study aims to investigate current control practices in pig holdings and to analyze the potential of a financial support on the implementation of professional pest control. Results Data were collected from monitoring records of PCOs and personal interviews with farmers and PCOs. 33 of 47 farmers, who were offered the possibility to outsource rodent control to PCOs supported by financial contribution of the North Rhine-Westphalian Animal Disease Fund (TSK) for a period of 2 years, joined the project.Despite the widespread opinion that the professional would not be beneficial - the authors figured out that farmers could financially benefit in time saved and by improved rodent control measures from the work of the PCOs. Costs of pest control measures per operation on average did not differ significantly between costs incurred by employment of PCOs (1.310 € per year) and calculated costs that arise by farmers themselves (1.217 € per year).All PCOs used Difenacoum and Brodifacoum against pest infestations. In doing so, the infestation with rodents was reduced and most of the participating farmers assessed the project as successful and employ the PCOs permanently. However, mapping the farm locations to resistance areas of the Rodenticide Resistance Action Committee (RRAC) shows that Brodifacoum was frequently used in areas which are marked as areas that are at low risk or rather have no risk for resistance. The environmental risks, however, are increased in these areas. Conclusion The instrument of temporal start-up financing professional pest control allows ensuring the continuous engagement of PCOs after the project period. This could possibly lead to long-term effects on the individual farm hygiene and on disease prevention. Nevertheless, important research questions with regard to the application of anticoagulant rodenticides of farmers and PCOs in livestock farming and with regard to risk mitigation measures were generated, meriting further investigation.
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Affiliation(s)
- Odile C Hecker
- Department of Agriculture, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest, Germany
| | - Marc Boelhauve
- Department of Agriculture, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest, Germany
| | - Marcus Mergenthaler
- Department of Agriculture, South Westphalia University of Applied Sciences, Lübecker Ring 2, 59494 Soest, Germany
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Fourel I, Sage M, Benoit E, Lattard V. Liver and fecal samples suggest differential exposure of red fox (Vulpes vulpes) to trans- and cis-bromadiolone in areas from France treated with plant protection products. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 622-623:924-929. [PMID: 29227943 DOI: 10.1016/j.scitotenv.2017.12.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/04/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Affiliation(s)
- Isabelle Fourel
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280, MARCY L'ETOILE, France.
| | - Mickaël Sage
- Wildlife Environment Expertise, 25 rue de la Grette, F-25000 Besancon, France
| | - Etienne Benoit
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280, MARCY L'ETOILE, France
| | - Virginie Lattard
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280, MARCY L'ETOILE, France
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Horak KE, Fisher PM, Hopkins B. Pharmacokinetics of Anticoagulant Rodenticides in Target and Non-target Organisms. EMERGING TOPICS IN ECOTOXICOLOGY 2018. [DOI: 10.1007/978-3-319-64377-9_4] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Fourel I, Damin-Pernik M, Benoit E, Lattard V. Cis-bromadiolone diastereoisomer is not involved in bromadiolone Red Kite (Milvus milvus) poisoning. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 601-602:1412-1417. [PMID: 28605859 DOI: 10.1016/j.scitotenv.2017.06.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 06/01/2017] [Accepted: 06/02/2017] [Indexed: 05/12/2023]
Abstract
Anticoagulant rodenticides (ARs) are widely used pesticides to control rodent populations. Bromadiolone, a second generation anticoagulant rodenticide (SGARs), is authorized in France to control the population of water voles (Arvicola scherman). The persistence of SGARs in rodents is responsible for secondary exposure or poisoning of predators and scavengers, and is of ecological concern for the conservation of endangered species. Commercial formulations are a mixture of two diastereoisomers of bromadiolone: 70-90% is trans-bromadiolone and 10-30% is cis-bromadiolone. Both diastereoisomers have been shown to inhibit coagulation function with the same potency. On the other hand, cis-bromadiolone has been shown to be less tissue-persistent than trans-bromadiolone in rats. This difference led to residue levels in rats with substantially weakened proportion in cis-bromadiolone compared to the composition of baits. In this study, a multi-residue LC-MS/MS method for the quantification of the diastereoisomers of SGARs was used to investigate their proportions in field samples of predators. In 2011, 28 red kites (Milvus milvus) were found dead within a few months of bromadiolone application in grassland to control water vole outbreaks. In this study, we report the concentrations of the two diastereoisomers of bromadiolone measured in the livers of thirteen red kites. Exposure to bromadiolone was apparent in all the kites with hepatic concentrations of trans-bromadiolone ranging from 390 to 870ng/g (89 to 99% of summed SGARs). However, cis-bromadiolone was not detected in 5 of 13 red kites and was present at very low concentrations (below 2.2ng/g) in 8 of 13 kites, demonstrating that cis-bromadiolone is not involved in this red kite poisoning event. The results suggest that a change of the proportions of bromadiolone diastereoisomers in baits could reduce the risk of secondary poisoning of predators, but retain primary toxicity for control rodent outbreaks.
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Affiliation(s)
- Isabelle Fourel
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280 Marcy l'Etoile, France.
| | | | - Etienne Benoit
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280 Marcy l'Etoile, France
| | - Virginie Lattard
- USC 1233 RS2GP, VetAgro Sup, INRA, Univ Lyon, F-69280 Marcy l'Etoile, France
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