Extraordinary high natal philopatry in a migratory passerine |
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Authors: | Marc I F?rschler Esther del Val and Franz Bairlein |
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Institution: | (1) Institute of Avian Research, Vogelwarte Helgoland, An der Vogelwarte 21, 26386 Wilhelmshaven, Germany;(2) Museu de Ci?ncies Naturals de Barcelona, Parc de la Ciutadella, s/n, 08003 Barcelona, Spain |
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Abstract: | Natal dispersal is a key component of population dynamics in birds. It guarantees the genetic exchange of populations, favours
range expansions and reduces intraspecific competition. In general, natal philopatry of migratory passerines is quite low
(0–13.5%). In this study, we give evidence that, under specific conditions, migratory populations of passerine birds may show
a considerably elevated natal philopatry. In a Linnet Carduelis cannabina population on the remote island of Helgoland in the North Sea, we found an extraordinary high return rate of yearlings (38%),
which corresponds exactly to the annual survival rate of the species. Despite being completely migratory, the Linnets of Helgoland
apparently return to a large extent to their native area and consequently might support the population maintenance on the
island. Further studies are needed to reveal if this high natal philopatry is only an unusual 1-year event or a general characteristic
of this partially isolated island population. |
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