Fuel deposition and speed of early autumn migration of juvenile Bluethroats Luscinia s. svecica leaving their natal area in Swedish Lapland

Authors

  • Åke Lindström Department of Biology, Lund University
  • Johan Lind Department of Zoology, Stockholm University

DOI:

https://doi.org/10.34080/os.v11.22850

Keywords:

moult, migration timing, stopover sites, staginging sites, phenology

Abstract

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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Published

2001-10-01

How to Cite

Lindström, Åke, & Lind, J. (2001). Fuel deposition and speed of early autumn migration of juvenile Bluethroats Luscinia s. svecica leaving their natal area in Swedish Lapland. Ornis Svecica, 11(4), 253–264. https://doi.org/10.34080/os.v11.22850

Issue

Section

Research Papers

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