GPS tracking of non-breeding ravens reveals the importance of anthropogenic food sources during their dispersal in the Eastern Alps

Loretto, Matthias-Claudio; Schuster, Richard; Bugnyar, Thomas

GPS tracking of non-breeding ravens reveals the importance of anthropogenic food sources during their dispersal in the Eastern Alps

Dateien

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Datum

2016

Autor:innen

Loretto, Matthias-Claudio

Schuster, Richard

Bugnyar, Thomas

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Current Zoology. Oxford University Press. 2016, 62(4), pp. 337-344. ISSN 1674-5507. eISSN 2396-9814. Available under: doi: 10.1093/cz/zow016

Zusammenfassung

In many songbirds, the space use of breeders is well studied but poorly understood for non-breeders. In common ravens, some studies of non-breeders indicate high vagrancy with large individual differences in home range size, whereas others show that up to 40% of marked non-breeders can be regularly observed at the same anthropogenic food source over months to years. The aim of this study was to provide new insights on ravens' behavior during dispersal in the Eastern Alps. We deployed Global Positioning System (GPS) loggers on 10 individuals to gather accurate spatial and temporal information on their movements to quantify: 1) the dimension of the birds' space use (home range size with seasonal effects and daily/long-term travel distances), 2) how long they stayed in a dispersal stage of wandering as opposed to settling temporarily, and 3) their destination of movements. We recorded movements of up to 40 km per hour, more than 160 km within 1 day and more than 11,000 km within 20 months, indicating high vagrancy. Switching frequently between temporarily settling and travelling large distances in short time intervals leads to extensive home ranges, which also explains and combines the different findings in the literature. The destinations are rich anthropogenic food sources, where the birds spent on average 75% of their time. We discuss how ravens may find these "feeding hot spots" and which factors may influence their decision to stay/leave a site. The strong dependence on anthropogenic resources found in this population may have implications for site management and conservation issues.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

common raven, Corvus corax, non-breeder, space use, dispersal, kernel density

Zitieren

ISO 690

LORETTO, Matthias-Claudio, Richard SCHUSTER, Thomas BUGNYAR, 2016. GPS tracking of non-breeding ravens reveals the importance of anthropogenic food sources during their dispersal in the Eastern Alps. In: Current Zoology. Oxford University Press. 2016, 62(4), pp. 337-344. ISSN 1674-5507. eISSN 2396-9814. Available under: doi: 10.1093/cz/zow016

BibTex

@article{Loretto2016-08track-49972,
  year={2016},
  doi={10.1093/cz/zow016},
  title={GPS tracking of non-breeding ravens reveals the importance of anthropogenic food sources during their dispersal in the Eastern Alps},
  number={4},
  volume={62},
  issn={1674-5507},
  journal={Current Zoology},
  pages={337--344},
  author={Loretto, Matthias-Claudio and Schuster, Richard and Bugnyar, Thomas}
}

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    <dcterms:abstract xml:lang="eng">In many songbirds, the space use of breeders is well studied but poorly understood for non-breeders. In common ravens, some studies of non-breeders indicate high vagrancy with large individual differences in home range size, whereas others show that up to 40% of marked non-breeders can be regularly observed at the same anthropogenic food source over months to years. The aim of this study was to provide new insights on ravens' behavior during dispersal in the Eastern Alps. We deployed Global Positioning System (GPS) loggers on 10 individuals to gather accurate spatial and temporal information on their movements to quantify: 1) the dimension of the birds' space use (home range size with seasonal effects and daily/long-term travel distances), 2) how long they stayed in a dispersal stage of wandering as opposed to settling temporarily, and 3) their destination of movements. We recorded movements of up to 40 km per hour, more than 160 km within 1 day and more than 11,000 km within 20 months, indicating high vagrancy. Switching frequently between temporarily settling and travelling large distances in short time intervals leads to extensive home ranges, which also explains and combines the different findings in the literature. The destinations are rich anthropogenic food sources, where the birds spent on average 75% of their time. We discuss how ravens may find these "feeding hot spots" and which factors may influence their decision to stay/leave a site. The strong dependence on anthropogenic resources found in this population may have implications for site management and conservation issues.</dcterms:abstract>
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