Organochlorine pesticide levels in barn owls collected in León, Spain

Sierra, Matilde; Santiago, Diego

doi:10.1007/bf01606671

Cited by 9 publications

(1 citation statement)

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“…20 years before our sampling, the prevalence of the parent compound in both liver and feathers raises concern. A study conducted 30 years ago in Spain revealed higher p,p′-DDE (2.9 times) and aldrin (150 times) hepatic concentrations in the barn owl (Sierra and Santiago 1987), but our results show higher hepatic concentrations of endrin (1.6 times) and dieldrin (15.8 times). Nonetheless, maximum Ʃdrins concentration found in Portuguese barn owl livers represents only 0.03 of the minimum range of dieldrin liver residues associated with lethality in the species (6 000 ng g −1 ; Newton et al 1991).…”

Section: Resultscontrasting

confidence: 97%

A First Record of Organochlorine Pesticides in Barn Owls (Tyto alba) from Portugal: Assessing Trends from Variation in Feather and Liver Concentrations

Roque

Lourenço

Marques

et al. 2022

Bull Environ Contam Toxicol

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We evaluated feathers as a non-destructive biomonitoring tool documenting organochlorine pesticides (OCP) in liver and checked possible trends in pesticide use in two areas based on OCP concentrations in barn owls (Tyto alba). We measured the concentrations of 16 OCP in 15 primary feathers and 15 livers from barn owl carcasses collected on roadsides in Tagus Valley and Évora regions, south Portugal. Total OCP mean concentration was 8 120 ng g −1 in feathers and 178 ng g −1 in livers. All compounds were detected in feathers while in livers δ-HCH, endosulfan sulphate, p,p′-DDT and p,p′-DDD were not detected. The high β-HCH and heptachlor concentrations in feathers most likely derived from external endogenous contamination. P,p′-DDE was the OCP with the highest hepatic concentration. Both matrices indicated an exposure to recently released heptachlor. The differing OCP concentrations between Tagus Valley and Évora seem to reflect differences in landuse and pesticide use histories of the two locations, and/or faster degradation of OCP in the Tagus area.

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Section: Resultscontrasting

confidence: 97%