Converging migration routes of Eurasian hobbiesFalco subbuteocrossing the African equatorial rain forest
- 4 November 2008
- journal article
- research article
- Published by The Royal Society in Proceedings. Biological sciences
- Vol. 276 (1657), 727-733
- https://doi.org/10.1098/rspb.2008.1202
Abstract
Autumn migration of adult Eurasian hobbies Falco subbuteo from Europe to southern Africa was recorded by satellite telemetry and observed routes were compared with randomly simulated routes. Two non-random features of observed routes were revealed: (i) shifts to more westerly longitudes than straight paths to destinations and (ii) strong route convergence towards a restricted area close to the equator (18 S, 15 degrees E). The birds migrated south or southwest to approximately 10 degrees N, where they changed to southeasterly courses. The maximal spread between routes at 10 degrees N (2134 km) rapidly decreased to a minimum (67 km) close to the equator. We found a striking relationship between the route convergence and the distribution of continuous rainforest, suggesting that hobbies minimize flight distance across the forest, concentrating in a corridor where habitat may be more suitable for travelling and foraging. With rainforest forming a possible ecological barrier, many migrants may cross the equator either at 15 degrees E, similar to the hobbies, or at 30-40 degrees E, east of the rainforest where large-scale migration is well documented. Much remains to be understood about the role of the rainforest for the evolution and future of the transequatorial Palaearctic-African bird migration systems.This publication has 17 references indexed in Scilit:
- All across Africa: highly individual migration routes of Eleonora's falconProceedings. Biological sciences, 2008
- THE SOUTHWARD MIGRATION OF PALAEARCTIC BIRDS OVER NGULIA, KENYAIbis, 2008
- Temporal and spatial patterns of repeated migratory journeys by ospreysAnimal Behaviour, 2006
- The role of wind in passerine autumn migration between Europe and AfricaBehavioral Ecology, 2005
- Non‐random distribution of ring recoveries from trans‐Saharan migrants indicates species‐specific stopover areasJournal of Avian Biology, 2004
- Can vector summation describe the orientation system of juvenile ospreys and honey buzzards? – An analysis of ring recoveries and satellite trackingOikos, 2003
- The orientation system and migration pattern of long‐distance migrants: conflict between model predictions and observed patternsJournal of Avian Biology, 2001
- A Mathematical Expectation Model for Bird Navigation based on the Clock-and-Compass StrategyJournal of Theoretical Biology, 2000
- Routes and Travel Rates of Migrating Peregrine Falcons Falco peregrinus and Swainson's Hawks Buteo swainsoni in the Western HemisphereJournal of Avian Biology, 1998
- Birds on the Wing: Flight Strategies of Migrating Hawks . Paul Kerlinger. University of Chicago Press, Chicago, 1989. xvi, 375 pp., illus. $60; paper, $19.95.Science, 1990