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Author
J. Shamoun-Baranes
E.E. van Loon
D. Alon
P. Alpert
Y. Yom-Tov
Y. Leshem
Year
2006
Title
Is there a connection between weather at departure sites, onset of migration and timing of soaring-bird autumn migration in Israel?
Journal
Global Ecology and Biogeography
Volume | Issue number
15 | 6
Pages (from-to)
541-552
Number of pages
12
Document type
Article
Faculty
Faculty of Science (FNWI)
Institute
Institute for Biodiversity and Ecosystem Dynamics (IBED)
Abstract
Aims
Different aspects of soaring-bird migration are influenced by weather. However, the relationship between weather and the onset of soaring-bird migration, particularly in autumn, is not clear. Although long-term migration counts are often unavailable near the breeding areas of many soaring birds in the western Palaearctic, soaring-bird migration has been systematically monitored in Israel, a region where populations from large geographical areas converge. This study tests several fundamental hypotheses regarding the onset of migration and explores the
connection between weather, migration onset and arrival at a distant site.
Location
Globally gridded meteorological data from the breeding areas in north-eastern Europe were used as predictive variables in relation to the arrival of soaring migrants in Israel.
Methods
Inverse modelling was used to study the temporal and spatial influence of weather on initiation of migration based on autumn soaring-bird migration counts in Israel. Numerous combinations of migration duration and temporal influence of meteorological variables (temperature, sea-level pressure and precipitable water) were tested with different models for meteorological sensitivity.
Results
The day of arrival in Israel of white storks, honey buzzards, Levant sparrowhawks and lesser spotted eagles was significantly and strongly related to meteorological conditions in the breeding area days or even weeks before arrival in Israel. The cumulative number of days or cumulative value above or below a meteorological threshold performed significantly better than other models tested. Models provided reliable estimates of migration duration for each species.
Main conclusions
The meteorological triggers of migration at the breeding grounds differed between species and were related to deteriorating living conditions and deteriorating migratory flight conditions. Soaring birds are sensitive to meteorological triggers at the same period every year and their temporal response to weather appears to be constrained by their annual routine.
URL
go to publisher's site
Language
Undefined/Unknown
Permalink
http://hdl.handle.net/11245/1.259099

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