A new large-scale index (AcED) for assessing traffic noise disturbance on wildlife: stress response in a roe deer (Capreolus capreolus) population

  • Carlos Iglesias-MerchanEmail author
  • Fernando Horcajada-Sánchez
  • Luis Diaz-Balteiro
  • Gema Escribano-Ávila
  • Carlos Lara-Romero
  • Emilio Virgós
  • Aimara Planillo
  • Isabel Barja


Anthropogenic noise is a growing ubiquitous and pervasive pollutant as well as a recognised stressor that spreads throughout natural ecosystems. However, there is still an urgent need for the assessment of noise impact on natural ecosystems. This article presents a multidisciplinary study which made it possible to isolate noise due to road traffic to evaluate it as a major driver of detrimental effects on wildlife populations. A new indicator has been defined: AcED (the acoustic escape distance) and faecal cortisol metabolites (FCM) were extracted from roe deer faecal samples as a validated indicator of physiological stress in animals moving around in two low-traffic roads that cross a National Park in Spain. Two key findings turned out to be relevant in this study: (i) road identity (i.e. road type defined by traffic volume and average speed) and AcED were the variables that best explained the FCM values observed in roe deer, and (ii) FCM concentration was positively related to increasing traffic volume (road type) and AcED values. Our results suggest that FCM analysis and noise mapping have shown themselves to be useful tools in multidisciplinary approaches and environmental monitoring. Furthermore, our findings aroused the suspicion that low-traffic roads (< 1000 vehicles per day) could be capable of causing higher habitat degradation than has been deemed until now.


Cortisol metabolites Noise modelling Physiological stress Low traffic road National park Road ecology 



Permission to do research in the former Peñalara Natural Park (now called Sierra of Guadarrama National Park) was granted by the Regional Government of Madrid for two consecutive years. Special thanks and acknowledgements go to Juan Vielva (Park Director) and the entire staff of the National Park. Thanks are given to Harald Aagesen Muñoz and Douglas Manwell (Brüel and Kjaer) for instrumental support and also to PRS and Diana Badder for editing the English. The work of Luis Diaz-Balteiro was funded by the Spanish Ministry of Education and Science under project AGL2011-25825. Also, part of this study was funded by the Spanish Ministry for Innovation and Science by the grant CALCOFIS: CGL-2009-13013. Carlos Lara-Romero y Gema Escribano-Avila were supported by a Juan de la Cierva postdoctoral fellowship. We also want to thank an anonymous reviewer for their careful reading of our manuscript and both Prof. G.B. Wiersma and Dr. J.A. Elvir for their work and patience as editors during the reviewing process.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Carlos Iglesias-Merchan
    • 1
    • 2
    Email author
  • Fernando Horcajada-Sánchez
    • 3
  • Luis Diaz-Balteiro
    • 1
  • Gema Escribano-Ávila
    • 4
  • Carlos Lara-Romero
    • 4
  • Emilio Virgós
    • 4
  • Aimara Planillo
    • 5
  • Isabel Barja
    • 6
  1. 1.Research Group Economics for a Sustainable EnvironmentUniversidad Politécnica de MadridMadridSpain
  2. 2.CENERIC Research CentreTres CantosSpain
  3. 3.Centro de Investigación, Seguimiento y Evaluación, Parque Nacional de la Sierra de Guadarrama, Dirección General del Medio Ambiente, Comunidad de MadridMadridSpain
  4. 4.Área de Biodiversidad y Conservación, Escuela Superior de Ciencias Experimentales y TecnologíaUniversidad Rey Juan CarlosMóstolesSpain
  5. 5.Terrestrial Ecology Group (TEG), Departamento de EcologíaUniversidad Autónoma de MadridMadridSpain
  6. 6.Unidad de Zoología, Departamento de Biología, Facultad de CienciasUniversidad AutónomaMadridSpain

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