Division of labour within cooperatively breeding groups

Arnold, K. E., Owens, I. P. F. and Goldizen, A. W. (2005) Division of labour within cooperatively breeding groups. Behaviour, 142 1577-1590. doi:10.1163/156853905774831927


Author Arnold, K. E.
Owens, I. P. F.
Goldizen, A. W.
Title Division of labour within cooperatively breeding groups
Journal name Behaviour   Check publisher's open access policy
ISSN 0005-7959
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1163/156853905774831927
Volume 142
Start page 1577
End page 1590
Total pages 14
Editor Jan Komedur
Dik Heg
Place of publication Leiden
Publisher Brill Academic Publishers
Language eng
Subject C1
270707 Sociobiology and Behavioural Ecology
780105 Biological sciences
Abstract Within cooperative societies, group members share in caring for offspring. Although division of labour among group members has been relatively well studied in insects, less is known about vertebrates. Most studies of avian helping focus solely on the extent to which helpers provision the offspring, however, helpers can participate in everything from nest building to predator defence. Bad provisioners may, for example, not be as 'uncooperative' as they appear. if they are good defenders. Thus, the distribution of helping tasks between group members should have important implications for our interpretation of group dynamics. Here, we compare two distinct forms of helping behaviour in the cooperatively breeding noisy miner (Manorina melanocephala): chick provisioning and mobbing nest predators. We show that the way in which individual helpers invest in these two helping behaviours varies enormously across individuals and among social groups. Good provisioners often contributed relatively little to mobbing and vice versa. Indeed, (18%) of helpers only mobbed, 22% just provisioned, whereas 60% of helpers performed both forms of helping. Across nests, provisioning was significantly negatively correlated with mobbing effort. We suggest that small differences in the costs or benefits of different aspects of helping (due to differences in age, relatedness or social status) have a big impact on the division of labour within a group. Consequently, social groups can be made up from individuals who often specialise in one helping behaviour, and/or helpers who perform a number of behaviours to differing degrees. Division of labour within social groups will, therefore, have important consequences for the maintenance of cooperatively breeding in vertebrates.
Keyword Behavioral Sciences
Zoology
Cooperative Breeding
Provisioning
Mobbing
Division Of Tabour
Behavioural Syndromes
White-winged Choughs
Nest Defense
Manorina-melanocephala
Social Insects
Helpers
Behavior
Evolution
Birds
Investment
Benefit
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 17:16:03 EST