Faced with the same threat, city and country birds do not react in the same way despite being from the same species. According to a new study, urban birds have changed their anti-predator behaviour in new environments.
When a bird is faced with a predator, its only objective is to escape. However, city birds do not react in the same way as their countryside counterparts, despite being from the same species. Urbanisation plays an influential role in their survival strategies.
To study this phenomenon, Juan Diego Ibáñez-Álamo, researcher at the University of Granada (UGR) and Anders Pape Møller from Paris-Sud University (France) analysed the escape techniques of 1,132 birds belonging to 15 species in different rural and urban areas.
Published in the Animal Behaviour journal, the results show that city birds have changed their behaviour to adapt to new threats like cats (their main predator in the city) instead of their more traditional enemies in the countryside, such as the sparrow hawk.
"When they are captured, city birds are less aggressive, they produce alarm calls more frequently, they remain more paralysed when attacked by their predator and they loose more feathers than their countryside counterparts," as explained to SINC by Juan Diego Ibáñez-Álamo.
The surprising thing is that urbanisation is directly linked with these differences, which become more acute the earlier the former has taken place. This suggests that escape strategies evolve alongside the expansion of cities; a concept that is on the increase worldwide.
Adapt or die in the territory of man
Like the habitat of many animals and plants, the habitat of birds changes and fragments. Discovering how they adapt to transformations in their habitat is "crucial" for understanding how to lessen their effects. "Predation change caused by city growth is serious," outlines Ibáñez-Álamo.
As the scientist indicates, tactics against their hunters are "crucial" so that birds can adapt to their new environment: "Birds should modify their behaviour to be able to survive in cities because if not, they will become extinct at the mercy of urban growth."
Møller, A. P.; Ibáñez-Álamo, J. D. "Escape behaviour of birds provides evidence of predation being involved in urbanization" Animal Behaviour 84(2): 341-348 DOI: 10.1016/j.anbehav.2012.04.030, 2012.
FECYT - Spanish Foundation for Science and Technology: http://www.fecyt.es/fecyt/home.do
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
A survey of birds has identified 361 new species that had previously been confused with known species, a quarter of which are considered threatened
Wild monkeys living in forests near Japan's devastated Fukushima nuclear reactor show worrying signs of radiation exposure
Audubon Minnesota warns that a signature feature of the new Vikings stadium, a 200,000-square-foot wall of glass, could lead to thousands of bird collisions. Kim Johnson of WCCO reports.
Changes in the Antarctic climate are showing up in the fur seal population, say scientists who have studied the animals for 30 years on the British Overseas Territory of South Georgia.
The best way to protect forests, and the carbon they contain that could otherwise cause global warming, is to hand them over to local communities
Scientists disagree about some surprising data on the state of the ice in Antarctica
Augmented and virtual reality games may help crack the code of getting humans to do something about the environment
Drones detect far more ocean garbage than previously known, including debris from Japan's 2011 tsunami
Scientist estimates that eating a pound of beef causes more greenhouse warming than burning a gallon of gasoline
May was the hottest on record, too