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Anticoagulant rodenticide exposure in Barred Owls (Strix varia) collected in Washington and Oregon 2015-2017


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Wiens, J.D., and Dilione, K.E., 2019, Anticoagulant rodenticide exposure in Barred Owls (Strix varia) collected in Washington and Oregon 2015-2017: U.S Geological Survey data release,


This dataset includes anticoagulant rodenticide (AR) screening results of 40 Barred Owls (Strix varia) collected in forested landscapes of Washington and Oregon from 2015-2017. Liver tissue was collected from each owl and screened for exposure to eight AR compounds, including 4 first-generation ARs (warfarin, diphacinone, chlorophacinone, and coumachlor), and 4 second-generation ARs (brodifacoum, bromadionlone, difethialone, and difenacoum). Additionally, this dataset includes geographic, temporal, environmental, and biological attributes of individual owls that were identified as potential sources of variation in AR exposure and/or useful measurements for assessing AR exposure risk of sympatric northern spotted owls (S. occidentalis [...]


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Anticoagluant_rodenticide_exposure_Barred_Owls_WA_OR_40.csv 5.23 KB text/csv


Liver tissue samples were collected from Barred Owls removed from habitats and territories historically used by Northern Spotted Owls as part of a broad-scale experiment to determine if reducing populations of invasive Barred Owls can improve population trends of threatened Northern Spotted Owls. Livers were screened for AR exposure to assess the prevalence of AR exposure among nontarget wildlife in remote west coast forests, and to investigate possible intrinsic and extrinsic sources of variation in exposure (e.g., proximity to forest-urban interface, sex, age class, and territorial status of individuals).

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DOI doi:10.5066/P9S51J9K

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