Effects of site fidelity, group size and age on food-caching behaviour of common ravens, Corvus corax

Beck, Kristina B.; Loretto, Matthias-Claudio; Bugnyar, Thomas

Effects of site fidelity, group size and age on food-caching behaviour of common ravens, Corvus corax

Dateien

Beck_2-15vwimfyybefp1.pdfGröße: 2.22 MBDownloads: 329

Datum

2020

Autor:innen

Beck, Kristina B.

Loretto, Matthias-Claudio

Bugnyar, Thomas

Angaben zur Forschungsförderung

European Union (EU): 798091

Open Access-Veröffentlichung

Open Access Hybrid

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Animal Behaviour. Elsevier. 2020, 164, pp. 51-64. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2020.03.015

Zusammenfassung

The storage of food is widespread among mammals and birds and can be flexibly adjusted to various contexts such as competition, food availability or energetic demands. In bird species, nonbreeders often move through large areas whereby periods of long-term settlement can alternate with short-term visits. In food-caching species these differences in the degree of local settlement might change the benefits gained from storing food, and caching may only be advantageous during periods of prolonged settlement. We examined whether differences in local settlement influence food-caching behaviour of wild common ravens at a local anthropogenic food source with high interspecific and intraspecific competition. We found that individuals with a higher degree of site fidelity (i.e. prolonged periods of local settlement) engaged in food caching more than individuals with less site fidelity (i.e. short periods of local settlement); this effect was even stronger in the presence of potential predators representing a high-risk foraging situation. Further, juvenile ravens were less likely to cache than subadults and adults, and an increasing number of conspecifics present at the feeding site decreased the likelihood of caching. We found considerable individual variation in respect to the area used for caching. We suggest that individuals with higher site fidelity may gain more benefits from caching food and/or that they are more successful in obtaining food potentially due to more experience with the local foraging situation. Research is needed to examine the exact causes of the observed link between food-caching behaviour and the different degrees of site fidelity. Our findings show that differences in movement and settlement decisions can influence ecological aspects such as food acquisition and thus may have important consequences for individual fitness and population dynamics.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

common raven, Corvus corax, food caching, foraging competition, site fidelity

Zitieren

ISO 690

BECK, Kristina B., Matthias-Claudio LORETTO, Thomas BUGNYAR, 2020. Effects of site fidelity, group size and age on food-caching behaviour of common ravens, Corvus corax. In: Animal Behaviour. Elsevier. 2020, 164, pp. 51-64. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2020.03.015

BibTex

@article{Beck2020-06Effec-49504,
  year={2020},
  doi={10.1016/j.anbehav.2020.03.015},
  title={Effects of site fidelity, group size and age on food-caching behaviour of common ravens, Corvus corax},
  volume={164},
  issn={0003-3472},
  journal={Animal Behaviour},
  pages={51--64},
  author={Beck, Kristina B. and Loretto, Matthias-Claudio and Bugnyar, Thomas}
}

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Ja