Oecologia

, Volume 173, Issue 4, pp 1217–1225 | Cite as

Strong migratory connectivity and seasonally shifting isotopic niches in geographically separated populations of a long-distance migrating songbird

  • Steffen Hahn
  • Valentin Amrhein
  • Pavel Zehtindijev
  • Felix Liechti
Behavioral ecology - Original research

Abstract

Whether migratory animals use similar resources during continental-scale movements that characterize their annual cycles is highly relevant to both individual performances and population dynamics. Direct knowledge of the locations and resources used by migrants during non-breeding is generally scarce. Our goal was to estimate migratory connectivity of a small Palaearctic long-distance migrant, the common nightingale Luscinia megarhynchos, and to compare resources used in non-breeding areas with resources used at the breeding grounds. We tracked individuals of three geographically separated populations and characterised their stable isotope niches during breeding and non-breeding over 2 years. Individuals spent the non-breeding period in population-specific clusters from west to central Africa, indicating strong migratory connectivity at the population level. Irrespective of origin, their isotopic niches were surprisingly similar within a particular period, although sites of residence were distant. However, niche characteristics differed markedly between breeding and non-breeding periods, indicating a consistent seasonal isotopic niche shift in the sampled populations. Although nightingales of distinct breeding populations migrated to different non-breeding areas, they chose similar foraging conditions within specific periods. However, nightingales clearly changed resource use between breeding and non-breeding periods, indicating adaptations to changes in food availability.

Keywords

Ecological niche Annual cycle Non-breeding period Geolocator Stable isotopes 

Supplementary material

442_2013_2726_MOESM1_ESM.doc (60 kb)
Supplementary material 1 (DOC 60 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Steffen Hahn
    • 1
  • Valentin Amrhein
    • 2
    • 3
  • Pavel Zehtindijev
    • 4
  • Felix Liechti
    • 1
  1. 1.Department of Bird MigrationSwiss Ornithological InstituteSempachSwitzerland
  2. 2.Zoological InstituteUniversity of BaselBaselSwitzerland
  3. 3.Research Station Petite Camargue AlsacienneSaint-LouisFrance
  4. 4.Institute of Biodiversity and Ecosystem ResearchBulgarian Academy of SciencesSofiaBulgaria

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