Reduced take-off ability in robins due to migratory fuel load
1999 (English)In: Behavioral Ecology and Sociobiology, ISSN 0340-5443, E-ISSN 1432-0762, Vol. 46, no 1, 65-70 p.Article in journal (Refereed) Published
Recent studies have shown that large fuel loads in small birds impair flying ability. This is the first study to show how migratory fuel load affects flying ability, such as velocity and height gained at take-off in a predator escape situation, in a medium-distance migrant, and whether they adjust their take-off according to predator attack angle. First-year robins (Erithacus rubecula) were subjected to simulated attacks from a model merlin (Falco columbarius), and take-off velocity and angle were analysed. Robins with a wing load of 0.19 g cm−2 took off at a 39% lower angle than robins with a wing load of 0.13 g cm−2, while velocity remained unaffected. The robins did not adjust their angle of ascent in accordance with the predator's angle of attack. Since many predators rely on surprise attacks, a difference in flight ability due to varying fuel loads found in migrating robins can be important for birds' chances of survival when actually attacked.
Place, publisher, year, edition, pages
1999. Vol. 46, no 1, 65-70 p.
Predation risk, Take-off ability, Wing load, Fuel load
Research subject Zoological physiology
IdentifiersURN: urn:nbn:se:su:diva-29077DOI: 10.1007/s002650050593OAI: oai:DiVA.org:su-29077DiVA: diva2:229069