Effect of Weekend Road Traffic on the Use of Space by Raptors

The traffic load near large cities may show dramatic cyclical changes induced by weekend tourism, and this could induce cyclical changes in the activity patterns of wildlife. We studied a 19-km-long section of a road that crossed a high-use raptor area near a large city in Spain. We observed 18 raptor species along this segment of the road, including some threatened species, such as the Spanish Imperial Eagle (Aquila adalberti). The number of cars increased dramatically on Saturdays and Sundays, so we assessed the effect of varying traffic loads on raptor behavior by recording all birds of prey as close or distant to the road during working days and weekend days. On weekends, the occurrence of Spanish Imperial Eagles and vultures decreased near the road. The occurrence of other species did not change between working days and weekend days. The activity decrease on weekends by Imperial Eagles and other large raptors suggests that there are weekly cycles in raptor activity. Weekly cycles in wildlife caused by human activity are a source of concern in conservation biology.

[1]  C.J.F. ter Braak,et al.  The effects of car traffic on breeding bird populations in woodland. Ill. Reduction of density in relation to the proximity of main roads , 1995 .

[2]  Ruud Foppen,et al.  The Effects of Car Traffic on Breeding Bird Populations in Woodland. I. Evidence of Reduced Habitat Quality for Willow Warblers (Phylloscopus trochilus) Breeding Close to a Highway , 1994 .

[3]  H. Southern,et al.  Handbook of the Birds of Europe, the Middle East and North Africa; the Birds of the Western Palearctic , 1978 .

[4]  S. Siegel,et al.  Nonparametric Statistics for the Behavioral Sciences , 2022, The SAGE Encyclopedia of Research Design.

[5]  W. J. van der Weijden,et al.  The impact of roads on the densities of four bird species in an open field habitat—evidence of a long-distance effect , 1980 .

[6]  A. H. Gordon.  Weekdays warmer than weekends? , 1994, Nature.

[7]  R. Forman,et al.  ROADS AND THEIR MAJOR ECOLOGICAL EFFECTS , 1998 .

[8]  M. Madders.  Habitat selection and foraging success of Hen Harriers Circus cyaneus in west Scotland , 2000 .

[9]  Í. Zuberogoitia,et al.  Environmental impact assessment on raptor populations: Difficulties in implementation and a search for solutions | La evaluación de impacto ambiental sobre las poblaciones de aves rapaces: Problemas de ejecución y posibles soluciones , 2003 .

[10]  G. Tucker,et al.  Birds in Europe : their conservation status , 1994 .

[11]  H. Hofer,et al.  Biological Conservation and Stress , 1998 .

[12]  Ian F. Spellerberg,et al.  Ecological effects of roads , 2002 .

[13]  Ruud Foppen,et al.  Disturbance by traffic of breeding birds: evaluation of the effect and considerations in planning and managing road corridors , 1997, Biodiversity & Conservation.

[14]  C. Frissell,et al.  Review of Ecological Effects of Roads on Terrestrial and Aquatic Communities , 2000 .

[15]  K. Laursen,et al.  Birds on roadside verges and the effect of mowing on frequency and distribution , 1981 .

[16]  P. Jouventin,et al.  Use of roadsides by diurnal raptors in agricultural landscapes , 2000 .

[17]  Reduced bird occurrence in pine forest fragments associated with road proximity in a Mediterranean agricultural area , 2001 .

[18]  P. Jouventin,et al.  Effects of landscape type and extensive management on use of motorway roadsides by small mammals , 1999 .

[19]  R. Balling,et al.  Weekly cycles of air pollutants, precipitation and tropical cyclones in the coastal NW Atlantic region , 1998, Nature.

[20]  David R. Anderson,et al.  Distance Sampling: Estimating Abundance of Biological Populations , 1995 .

[21]  B. Sherwood,et al.  Wildlife and Roads - The Ecological Impact , 2002 .

[22]  Ruud Foppen,et al.  The Effects of Car Traffic on Breeding Bird Populations in Woodland. II. Breeding Dispersal of Male Willow Warblers (Phylloscopus trochilus) in Relation to the Proximity of a Highway , 1994 .

[23]  C. Preston,et al.  Occurrence and Distribution of Diurnal Raptors in Relation to Human Activity and Other Factors at Rocky Mountain Arsenal, Colorado , 1996 .

[24]  R. Villafuerte,et al.  Size of Rabbits consumed by Black Kites increased after a Rabbit epizootic , 1999 .

[25]  Ruud Foppen,et al.  The effects of traffic on the density of breeding birds in Dutch agricultural grasslands , 1996 .

[26]  David E. Andersen,et al.  Response of Nesting Red-Tailed Hawks to Helicopter Overflights , 1989 .

[27]  D. Lemon,et al.  Effects of low‐level jet aircraft noise on the behaviour of nesting osprey , 1998 .

[28]  R. Villafuerte,et al.  Extensive predator persecution caused by population crash in a game species: The case of red kites and rabbits in Spain , 1998 .

[29]  C. Ferris.  Effects of Interstate 95 on Breeding Birds in Northern Maine , 1979 .