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The use of DNA fingerprinting to estimate annual survival rates in the Saker Falcon(Falco cherrug)

Abschätzung der jährlichen Überlebensraten des Sakerfalken(Falco cherrug) mittels DNA-Fingerprinting

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Summary

DNA fingerprinting of nestlings ofFalco cherrug was used to determine indirectly the survival of the corresponding adult parent birds, which are difficult to catch in sufficient numbers. This approach is possible because Saker falcons show a high degree of site and mate tenacity. DNA profiles of nestlings from the same territory but from different years were compared. Three patterns of band-sharing coefficients between broods from the same territory were found: if band-sharing coefficients within and between broods from consecutive years were similar but significantly different from those of unrelated birds, it indicated that all young were full sibs and that neither adult was replaced between years. If band-sharing coefficients between broods at the same site indicated no relatedness across years and were equal to those of unrelated birds, then both breeding partners apparently had changed. If the band-sharing coefficients between broods of the same territory and consecutive years were significantly lower than those of full sibs, but higher than those of unrelated birds, the loss of one adult bird was indicated. The analysis of 32 broods (years 1993 to 1997) provided a minimal estimate for annual adult survival of 82% for a wild population of Saker Falcons in Kazakhstan.

Zusammenfassung

Um die Gefährdung und Populationsdynamik des Sakerfalken (Falco cherrug) beurteilen zu können, benötigen wir genaue Angaben zu Mortalität und Überlebensraten. Während es bei dieser Art relativ einfach ist, Nestlinge zu fangen, ist es nahezu unmöglich, eine ausreichend große Zahl an Altvögeln zu markieren, um durch Wiederfang oder Ringfundmeldungen die jährliche Überlebensrate zu ermitteln. Durch DNA-Fingerprinting von Jungfalken haben wir versucht, die minimale Überlebensrate von Altfalken indirekt zu bestimmen. Dieser Forschungsansatz wird dadurch möglich, daß die Sakerfalken eine hohe Philopatrie aufweisen und jedes Jahr im selben Revier brüten. Wenn man mehrere Jahre lang Blutproben der Jungvögel aus denselben Revieren sammelt, so kann man mittels DNA Fingerprinting indirekt ermitteln, ob die jeweiligen Altvögel identisch waren oder gewechselt haben: Vergleicht man die Band-Sharing-Koeffizienten (BSK) von Jungvögeln von zwei oder mehr Jahren aus demselben Revier, so ergeben sich drei Muster: Wenn die BSK-Werte innerhalb der Bruten und zwischen den Bruten identisch aber signifikant verschieden von denen nicht verwandter Vögel sind, so handelt es sich bei den Jungvögeln um Vollgeschwister; demnach sind die Altvögel identisch geblieben, d. h. sie haben von einem Jahr zum nächsten überlebt. Wenn die BSK-Werte zwischen zwei Bruten aus demselben Revier einen Wert annehmen, wie man ihn für unverwandte Tiere ermittelt, so müssen die Eltern gewechselt haben. Liegen die Werte zwischen zwei Bruten signifikant höher als die von nicht verwandten Tieren, aber niedriger als diejenigen von Vollgeschwistern, so ist vermutlich 1 Altvogel gewechselt worden. Die Analyse von 32 Bruten des Sakerfalken aus Kasachstan zeigt, daß die minimale jährliche Adultüberlebensrate bei 82% liegt.

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Wink, M., Staudter, H., Bragin, Y. et al. The use of DNA fingerprinting to estimate annual survival rates in the Saker Falcon(Falco cherrug) . J Ornithol 140, 481–489 (1999). https://doi.org/10.1007/BF01650992

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