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Active monitoring of long-eared owl (Asio otus) nestlings reveals widespread exposure to anticoagulant rodenticides across different agricultural landscapes

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dc.contributor.authorSpadetto, Livia
dc.contributor.authorZamora Marín, José Manuel
dc.contributor.authorLeón Ortega, Mario
dc.contributor.authorDíaz García, Sarah
dc.contributor.authorTecles, Fernando
dc.contributor.authorFenoll, José
dc.contributor.authorCava, Juana
dc.contributor.authorCalvo, José Francisco,
dc.contributor.authorGarcía Fernández, Antonio Juan
dc.contributor.authorGómez Ramírez, Pilar
dc.contributor.departmentCiencias Sociosanitarias
dc.date.accessioned2025-01-26T11:22:18Z
dc.date.available2025-01-26T11:22:18Z
dc.date.issued2024-03-25
dc.description© 2024 The Author(s). This manuscript version is made available under the CC-BY 4.0 license http://creativecommons.org/licenses/by/4.0/ This document is the Published Manuscript version of a Published Work that appeared in final form in Science of the Total Environment . To access the final edited and published work see https://doi.org/10.1016/j.scitotenv.2024.170492
dc.description.abstractThe 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 (Sigma ARs) 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 Sigma ARs 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.es
dc.formatapplication/pdfes
dc.format.extent14es
dc.identifier.citationScience of the Total Environment, 2024, Vol. 918 : 170492
dc.identifier.doihttps://doi.org/10.1016/j.scitotenv.2024.170492
dc.identifier.issnPrint: 0048-9697
dc.identifier.issnElectronic: 1879-1026
dc.identifier.urihttp://hdl.handle.net/10201/149296
dc.languageenges
dc.publisherElsevier
dc.relationFundación Séneca 20945/PI/18.es
dc.relation.ispartofNew Insights In The Anticoagulant Rodenticides Risk Assessment On Non-Target Species (Arra-Notas)es
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0048969724006296?via%3Dihubes
dc.rightsinfo:eu-repo/semantics/openAccesses
dc.rightsAtribución 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectEcotoxicology
dc.subjectOwls
dc.subjectWildlife conservation
dc.subjectBiomonitoring
dc.subject.otherCDU::6 - Ciencias aplicadases
dc.titleActive monitoring of long-eared owl (Asio otus) nestlings reveals widespread exposure to anticoagulant rodenticides across different agricultural landscapeses
dc.typeinfo:eu-repo/semantics/articlees
dspace.entity.typePublicationes
relation.isAuthorOfPublicationa0c84987-f342-48dc-973c-912958efee27
relation.isAuthorOfPublicationcfe66521-035d-4f55-b5c0-5ee24d9b11d3
relation.isAuthorOfPublication.latestForDiscoverya0c84987-f342-48dc-973c-912958efee27
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