Taxon:
Lanius collurio

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Scientific Name
Lanius collurio
Common Name
Red-backed Shrike
Taxa Group
Laniidae
Environment
Move Mode

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2017 - 20202
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Author: Onrubia, Alejandro ×

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Now showing 1 - 2 of 2
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    Data package
    Data from: Migration of red-backed shrikes from the Iberian Peninsula: optimal or sub-optimal detour?
    (2017-03-23) Tøttrup, Anders P.; Pedersen, Lykke; Onrubia, Alejandro; Thorup, Kasper
    NOTE: An updated and larger version of this dataset is available. See https://doi.org/10.5441/001/1.4bt7365c. ABSTRACT: The current Northern Hemisphere migration systems are believed to have arisen since the last glaciation. In many cases, birds do not migrate strait from breeding to non-breeding areas but fly via a detour. All western European populations of red-backed shrikes Lanius collurio are assumed to reach their southern African wintering grounds detouring via southeast Europe. Based on theoretical considerations under an optimality framework this detour is apparently optimal. Here, we use individual geolocator data on red-backed shrikes breeding in Spain to show that these birds do indeed detour via southeast Europe en route to southern Africa where they join other European populations of red-backed shrikes and return via a similar route in spring. Disregarding potential wind assistance, the routes taken for the tracked birds in autumn were not optimal compared to crossing the barrier directly. For spring migration the situation was quite different with the detour apparently being optimal. However, when considering potential wind assistance estimated total air distances during autumn migration were overall similar and the barrier crossing shorter along the observed routes. We conclude that considering the potential benefit of wind assistance makes the route via southeast Europe likely to be less risky in autumn. However, it cannot be ruled out that other factors, such as following a historical colonisation route could still be important.
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    Data package
    Data from: Remarkably similar migration patterns between different red-backed shrike populations suggest that migration rather than breeding area phenology determines the annual cycle
    (2020-10-03) Pedersen, Lykke; Onrubia, Alejandro; Vardanis, Yannis; Barboutis, Christos; Waasdorp, Stef; van Helvert, Monique; Geertsma, Marten; Ekberg, Per; Willemoes, Mikkel; Strandberg, Roine; Matsyna, Ekaterina; Matsyna, Alexander; Klaassen, Raymond H.G.; Alerstam, Thomas; Thorup, Kasper; Tøttrup, Anders P.
    The regular fluctuation of resources across the Globe guides movements of migratory animals. To ensure sufficient reproductive output and maintain viable population sizes, migratory animals should match arrival at breeding areas with local peaks in resource availability. It is generally assumed that breeding phenology dictates the timing of the annual cycle, but this is poorly studied. Here, we use light‐level geolocator tracking data to compare the annual spatiotemporal migration patterns of a long‐distance migratory songbird, the red‐backed shrike, Lanius collurio, breeding at widely different latitudes within Europe. We find that populations use remarkably similar migration routes and are highly synchronized in time. Additional tracks from populations breeding at the edges of the European range support these similar migration patterns. When comparing timing of breeding and vegetation phenology, as a measure of resource availability across populations, we find that arrival and timing of breeding corresponds to the peak in vegetation greenness at northern latitudes. At lower latitudes birds arrive simultaneously with the more northerly breeding populations, but after the local greenness peak, suggesting that breeding area phenology does not determine the migratory schedule. Rather, timing of migration in red‐backed shrikes may be constrained by events in other parts of the annual cycle.