Dataset.

Nightjars, rabbits, and foxes interact on unpaved roads: spatial use of a secondary prey in a shared-predator system [Dataset]

Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/139765
Digital.CSIC. Repositorio Institucional del CSIC
  • Camacho, Carlos
  • Sáez, Pedro
  • Potti, Jaime
  • Fedriani, José M.
Between 2011 and 2012, we conducted transect counts of European rabbits (Oryctolagus cuniculus), red-necked nightjars (Caprimulgus ruficollis) and red foxes (Vulpes vulpes) along unpaved roads crossing the protected core of the Doñana National Park and a human-managed area located 10 km apart (37°1–7'N, 6°32–33'W). Rabbit abundance was estimated in April, June and September from transect counts conducted by driving a vehicle at a constant speed of 10-15 km/h along six different road stretches of 15 km each. Between April and September, we conducted weekly counts of road-sitting nightjars by driving a vehicle along a 35-km road circuit at a constant speed of 30 km/h, beginning 1-2 h after dusk. Fox abundance was estimated as the total number of fox sightings during the nightjar counts. In addition, in June and July 2011 and 2012 we examined the patterns of microhabitat selection by nightjars encountered during the nocturnal transects. We recorded their proximity to roadside vegetation (1 cm), measured as the perpendicular distance from the roadside, and vegetation height (1 cm)., Peer reviewed
 
DOI: http://hdl.handle.net/10261/139765
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/139765

HANDLE: http://hdl.handle.net/10261/139765
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/139765
 
Ver en: http://hdl.handle.net/10261/139765
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/139765

Arias Montano. Repositorio Institucional de la Universidad de Huelva
oai:rabida.uhu.es:10272/15269
Artículo científico (article). 2017

NIGHTJARS, RABBITS, AND FOXES INTERACT ON UNPAVED ROADS: SPATIAL USE OF A SECONDARY PREY IN A SHARED-PREDATOR SYSTEM

Arias Montano. Repositorio Institucional de la Universidad de Huelva
  • Camacho, Carlos
  • Sáez Gómez, Pedro|||0000-0001-5105-3960
  • Potti, Jaime
  • Fedriani, José María
Linear developments, such as roads and firebreaks, can increase encounter rates between predator and prey, which could affect predator-prey interactions and community dynamics. However, the extent to which prey responses at the interface between natural and anthropogenic habitats may be compared to those at the interface between natural habitats is unclear. Here, we used a shared-predator system to investigate the spatial response of red-necked nightjars (Caprimulgus ruficollis) to changing predation risk on roads, measured as the abundance of red foxes (Vulpes vulpes), and their primary prey (rabbits, Oryctolagus cuniculus). Because all three species coexist closely on unpaved roads in Donana National Park (Spain), we predicted that nightjars would experience increased predation risk during periods of high fox and low rabbit abundances. Birds could then modify their space use at a broad scale by moving away from risky unpaved roads or, at a finer scale, by seeking foraging microsites facilitating escape from attacks. Between 2011 and 2012, mean rabbit abundance on roads increased by 50%, and fox abundance decreased by 80%, indicating a substantial decrease in predation risk for nightjars. Unexpectedly, nightjar occurrence on roads did not increase as a consequence of the decrease in fox predation risk. However, nightjars foraging on roads became less apprehensive in their use of linear strips of roadside cover, which is known to function as a physical barrier against fox attacks. Specifically, under high predation risk, most nightjars perched on the ground nearby (< 15 cm) tall (> 150 cm) vegetation, whereas when predation risk decreased, they shifted to more exposed microsites near shorter (< 1 m) stands, but rarely close to cover (> 45 cm). Nightjars' preference for areas of high predator abundance strongly suggests that flexible microhabitat selection allows them to manage the overall predation risk independently of predator abundance. Our results highlight the importance of linear developments in determining risk exposure and prey use of apparently dangerous habitats and thus may contribute to a better understanding of risky behaviors of prey., We thank Sonia Sanchez and Basti Palacios for help during data collection, Carlos Davila and Carlos Molina for logistic support, and Lorenzo Perez for scientific discussion. Carlos Camacho thanks Airam Rodriguez for encouraging him to measure individual plant stands and the CNIO (Madrid) for hospitality during manuscript preparation. Constructive comments by Chris Whelan and an anonymous reviewer substantially improved this manuscript. Field work was conducted with no specific funding. The Portuguese Science Foundation (FCT) provided funds to Jose M. Fedriani (IF/00728/2013) through the strategic research program PEst/CC6316. Carlos Camacho received financial support from the Spanish Ministry of Economy and Competitiveness (SVP-2013-067686). The authors have no conflict of interest to declare. Data arc available at: https://digital.csic.es/handle/10261/139765.





Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/143431
Artículo científico (article). 2017

NIGHTJARS, RABBITS, AND FOXES INTERACT ON UNPAVED ROADS: SPATIAL USE OF A SECONDARY PREY IN A SHARED-PREDATOR SYSTEM

Digital.CSIC. Repositorio Institucional del CSIC
  • Camacho, Carlos
  • Saéz, Pedro
  • Potti, Jaime
  • Fedriani, José M.
Linear developments, such as roads and firebreaks, can increase encounter rates between predator and prey, which could affect predator–prey interactions and community dynamics. However, the extent to which prey responses at the interface between natural and anthropogenic habitats may be compared to those at the interface between natural habitats is unclear. Here, we used a shared-predator system to investigate the spatial response of red-necked nightjars (Caprimulgus ruficollis) to changing predation risk on roads, measured as the abundance of red foxes (Vulpes vulpes), and their primary prey (rabbits, Oryctolagus cuniculus). Because all three species coexist closely on unpaved roads in Do~nana National Park (Spain), we predicted that nightjars would experience increased predation risk during periods of high fox and low rabbit abundances. Birds could then modify their space use at a broad scale by moving away from risky unpaved roads or, at a finer scale, by seeking foraging microsites facilitating escape from attacks. Between 2011 and 2012, mean rabbit abundance on roads increased by 50%, and fox abundance decreased by 80%, indicating a substantial decrease in predation risk for nightjars. Unexpectedly, nightjar occurrence on roads did not increase as a consequence of the decrease in fox predation risk. However, nightjars foraging on roads became less apprehensive in their use of linear strips of roadside cover, which is known to function as a physical barrier against fox attacks. Specifically, under high predation risk, most nightjars perched on the ground nearby (<15 cm) tall (>150 cm) vegetation, whereas when predation risk decreased, they shifted to more exposed microsites near shorter (<1 m) stands, but rarely close to cover (>45 cm). Nightjars’ preference for areas of high predator abundance strongly suggests that flexible microhabitat selection allows them to manage the overall predation risk independently of predator abundance. Our results highlight the importance of linear developments in determining risk exposure and prey use of apparently dangerous habitats and thus may contribute to a better understanding of risky behaviors of prey., Peer reviewed




Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/139765
Dataset. 2016

NIGHTJARS, RABBITS, AND FOXES INTERACT ON UNPAVED ROADS: SPATIAL USE OF A SECONDARY PREY IN A SHARED-PREDATOR SYSTEM [DATASET]

Digital.CSIC. Repositorio Institucional del CSIC
  • Camacho, Carlos
  • Sáez, Pedro
  • Potti, Jaime
  • Fedriani, José M.
Between 2011 and 2012, we conducted transect counts of European rabbits (Oryctolagus cuniculus), red-necked nightjars (Caprimulgus ruficollis) and red foxes (Vulpes vulpes) along unpaved roads crossing the protected core of the Doñana National Park and a human-managed area located 10 km apart (37°1–7'N, 6°32–33'W). Rabbit abundance was estimated in April, June and September from transect counts conducted by driving a vehicle at a constant speed of 10-15 km/h along six different road stretches of 15 km each. Between April and September, we conducted weekly counts of road-sitting nightjars by driving a vehicle along a 35-km road circuit at a constant speed of 30 km/h, beginning 1-2 h after dusk. Fox abundance was estimated as the total number of fox sightings during the nightjar counts. In addition, in June and July 2011 and 2012 we examined the patterns of microhabitat selection by nightjars encountered during the nocturnal transects. We recorded their proximity to roadside vegetation (1 cm), measured as the perpendicular distance from the roadside, and vegetation height (1 cm)., Peer reviewed




1106