Dominance in a socially dynamic setting: hierarchical structure and conflict dynamics in ravens’ foraging groups

Autor(en)
Mario Gallego-Abenza, Jorg J.M. Massen, Palmyre Boucherie, Thomas Bugnyar
Abstrakt

Dominance hierarchies typically emerge in systemswhere group members reg- ularly encounter and compete for resources. In birds, the ‘open’ and dynamic structure of foraging groups may prevent the emergence of structured hierar- chies, although this assumption have hardly been tested. We report on agonistic data for ravens Corvus corax, collected over two 18-month periods for 183 marked individuals of a wild (fluid) population and 51 birds from six captive (stable) groups. We show that the dominance structure (steep and tran- sitive) inwild foraging groups is strikingly similar to that found in captivity. In the wild, we found that higher ranks are mainly occupied by males, older and more aggressive individuals that also tend to receive fewer aggressions. Explor- ing the mechanisms sustaining the wild dominance structure, we confirmed that males are more aggressive than females and, with age, tend to receive fewer aggressions than females. Males that are about to leave the foraging groups for some months are less aggressive than newcomers or locals, while newcomers are specifically targeted by aggressions in their first year (as juven- iles). Taken together, our results indicate that the socially dynamic conditions ravens face during foraging do not hinder, but provide opportunities for, using (advanced) social cognition. This article is part of the theme issue ‘The centennial of the pecking
order: current state and future prospects for the study of dominance hierarchies’.

Organisation(en)
Department für Verhaltens- und Kognitionsbiologie, Core Facility KLF für Verhaltens- und Kognitionsbiologie
Externe Organisation(en)
Utrecht University
Journal
Philosophical Transactions of the Royal Society B: Biological Sciences
Band
377
Anzahl der Seiten
12
ISSN
0962-8436
DOI
https://doi.org/10.1098/rstb.2020.0446
Publikationsdatum
01-2022
Peer-reviewed
Ja
ÖFOS 2012
106051 Verhaltensbiologie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/dominance-in-a-socially-dynamic-setting-hierarchical-structure-and-conflict-dynamics-in-ravens-foraging-groups(275e46f8-9a1b-4831-9484-d54acb4e1d7c).html