Abstract:
:Long-distance migrants are particularly recognized for the distances covered on migration, yet little is known about the distances they cover during the rest of the year. GPS-tracks of 29 Montagu's harriers from breeding areas in France, The Netherlands and Denmark showed that harriers fly between 35 653 and 88 049 km yr-1, of which on average only 28.5% is on migration. Mean daily distances during migration were 296 km d-1 in autumn and 252 km d-1 in spring. Surprisingly, males' daily distances during breeding (217 km d-1) were close to those during migration, whereas breeding females moved significantly less (101 km d-1) than males. In terms of flight distance, the breeding season seemed nearly as demanding as migration periods for males. During the six winter months, both sexes moved less (114 and 128 km d-1 for females and males, respectively) than during migration. Harriers therefore covered shorter daily distances during winter which might allow birds to compensate for the more demanding phases of migration and breeding.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Schlaich AE,Bouten W,Bretagnolle V,Heldbjerg H,Klaassen RHG,Sørensen IH,Villers A,Both Cdoi
10.1098/rsbl.2017.0073subject
Has Abstractpub_date
2017-06-01 00:00:00issue
6eissn
1744-9561issn
1744-957Xpii
rsbl.2017.0073journal_volume
13pub_type
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