Avian electrocution mortality in relation to pole design and adjacent habitat in Spain
GUYONNE F. E. JANSS a1andMIGUEL FERRER a1 a1 Department of Applied Biology, Estación Biológica de Doñana (C.S.I.C.), Avenida de Maria Luisa s/n, Pabellón del Perú, 41013 Sevilla, Spain. E-mail: firstname.lastname@example.org
Quantitative differences were assessed in avian mortality by electrocution between the most frequent pole designs and
habitat types in south-west Spain. Pin-type insulators in natural habitats accounted for 36.9% of total avian mortality.
Including all species, we estimated a mean annual death rate of 4.5 birds per 100 poles (95% confidence interval: 3.0-
6.03), of which 53.8% were diurnal birds of prey. We identified all power poles in the distribution area of the Spanish
Imperial Eagle Aquila
adalberti population of the Doñana area. The estimated total mortality for adults was 0.38 birds
per year and for immature eagles 3.38, which was 1.3% of the adult population and 30.0% of the mean annual number
of fledged young. Adequate modification of 18.6% of power poles in the distribution area of the eagle population
could reduce the total estimated mortality by 51.6%.