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Hepatic levels of anticoagulant rodenticides in predators from Spain: evidence of toxicity in field monitoring programs

AutorMateo, Rafael ; López-Perea, Jhon J.; Camarero, Pablo R.
Fecha de publicación2014
CitaciónSETAC North America 35th Annual Meeting (2014)
ResumenThe second generation (SGARs) have been found to be accumulative in non-target species and the consequences of this are still not well known. The aim of this research is to study the presence and concentration of ARs in tissues of predators potentially at risk of exposure. We analyzed ARs in liver of 349 wild animals found dead in Catalonia and Majorca Island (NE Spain). The species included 154 mammals and 195 birds: including two species of hedgehogs, five species of owls and four species of diurnal raptors. SGARs were detected in 63% of the studied animals and 23% had >200 ng ΣSGARs/g in liver. This threshold level, potentially associated with lethal poisoning, was exceeded most frequently in eagle owl (64%) and barn owl (34%). The SGARS identified were brodifacoum (40%), bromadiolone (35%), difenacoum (26%), flocoumafen (9%) and difethialone (7%). In both sampling areas we found a wide spatial distribution of positive animals, with higher density in areas with more human population. A similar exposure to SGARs was found in the Algerian hedgehog from Majorca (57%) than in the European hedgehog from Catalonia (58%), which may reflect a similar intensity in the use of rodenticides in both areas. On the contrary, a higher percentage of SGARs positives was found in the European scops owl in Majorca (57.7%) than in Catalonia (14.3%), which may be related to the sedentary presence of the island population compared to the African migratory pattern of the continental one. The levels of SGARS were similarly distributed in birds and mammals for brodifacoum and difenacoum, but birds tend to have lower levels of bromadiolone than mammals. The observed geometric means in birds and mammals for each SGAR was negatively related to LD50, particularly in birds. Moreover, the combinations of two or more SGARs tended to be more frequent than expected from the independent occurrence of each compound. These results may indicate that SGARs poisoning itself produces a bias for monitoring programs based on found dead animals, because accumulated SGARs adversely affect animal’s survival.
DescripciónResumen del trabajo presentado al Society of Environmental Toxicology and Chemistry North America 35th Annual Meeting, celebrado en Vancouver (Canadá) del 9 al 13 de noviembre de 2014.-- et al.
Aparece en las colecciones: (IREC) Comunicaciones congresos
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