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Impact of wind farms on soaring bird populations at a migratory bottleneck

  • Beatriz Martín
  • Coline Perez-Bacalu
  • Alejandro Onrubia
  • Manuela De Lucas
  • Miguel Ferrer
Original Article

Abstract

Collision with turbines at wind farms is expected to have a greater impact on birds at particular sites where high concentrations of individuals occur, such as migration bottleneck areas. The Strait of Gibraltar (southern Spain) has long been recognized as the most important bottleneck in western Europe for soaring bird migration. Moreover, this area is within one of the most important potential areas for wind energy generation in Spain. Here, we examine monthly migratory soaring bird abundance in relation to long-term avian mortality rates at 21 wind farms located near the Strait of Gibraltar using zero-inflated hurdle negative binomial and gamma models. Best fit models included an effect of season in the collision mortality rates and in the proportion of adult individuals within the total deaths. However, monthly bird abundance was not directly related to the number of fatalities over the year. The accumulated fatalities during autumn migration constitute a small percentage (1%) of the total migrating population size. Moreover, mortality peak during autumn migration is largely attributable to juvenile birds. In contrast, the number of fatalities coinciding with the breeding period constitutes a substantial proportion (6%) of the local population, and it involved substantial losses among adult birds. Our results show that wind farms probably have an individually low impact on the migratory population of soaring birds. On the contrary, annual losses among adult local birds are remarkably high considering the small size of the local populations, and they may have population level effects.

Keywords

Abundance Autumn migration Breeding population Migratory population Raptors Spring migration Storks Turbines 

Notes

Acknowledgements

We are grateful to the thousands of people (volunteers and staff) who collected the information presented in this study as well as to the Board of the Migres Foundation. The data set used in the analysis were provided by the Department of Cadiz of the Andalusian Environmental Ministry in the wind resource areas, and comprises records of dead birds collected during research studies and by maintenance personnel at the farms. We would also like to thank C. Torralvo and M. Gonzalez for their help in estimating local bird abundance within the study area. Many thanks, too, for R. A. Miller for his revision of the draft of this manuscript as well as for the editor and the anonymous referees for providing us with comments and suggestions that greatly helped to improve the manuscript.

Funding information

This research was carried out within the funding framework of the Wind Association of Tarifa (Asociación Eólica de Tarifa, AET). The data counts from the Strait of Gibraltar analyzed in the study were collected within the field monitoring campaigns 1999/2012 funded by grants of the Consejería de Medio Ambiente from the Junta de Andalucía (Spain).

Supplementary material

10344_2018_1192_MOESM1_ESM.docx (68 kb)
ESM 1 (DOCX 68 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Beatriz Martín
    • 1
    • 2
  • Coline Perez-Bacalu
    • 1
  • Alejandro Onrubia
    • 1
  • Manuela De Lucas
    • 3
  • Miguel Ferrer
    • 3
  1. 1.Fundación Migres CIMA CtraCádizSpain
  2. 2.Intergovernmental Oceanographic Commission of UNESCOMarine Policy and Regional Coordination SectionParis 07France
  3. 3.Ethology and Biodiversity Conservation, Doñana Biological StationCSICSevilleSpain

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