Fuel deposition and speed of early autumn migration of juvenile Bluethroats Luscinia s. svecica leaving their natal area in Swedish Lapland
Keywords:moult, migration timing, stopover sites, staginging sites, phenology
The period between independence and the early phase of autumn migration is a difficult period for juvenile birds and a relatively poorly known part of the annual cycle. We present data on post-juvenile moult, fuel deposition and speed of early autumn migration of "red-spotted" Bluethroats Luscinia s. svecica, studied during 14 years (1984—1997) in Ammarnäs, Swedish Lapland. The juvenile Bluethroats leave their natal site from early August onwards, while still being in active post-juvenile moult. They do not put on any noticeable fuel stores, probably because foraging conditions are generally poor. This is reflected in a very slow initial speed of migration (11–21 km/d) between the natal area and stopover sites in eastern Sweden.
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