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Social status and personality: stability in social state can promote consistency of behavioural responses
Stockholm University, Faculty of Science, Department of Zoology.ORCID iD: 0000-0002-6435-011X
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology. Linköping University, Sweden.ORCID iD: 0000-0003-4352-6275
2014 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 281, no 1774, 20132531Article in journal (Refereed) Published
Abstract [en]

Stability of 'state' has been suggested as an underlying factor explaining behavioural stability and animal personality (i.e. variation among, and consistency within individuals in behavioural responses), but the possibility that stable social relationships represent such states remains unexplored. Here, we investigated the influence of social status on the expression and consistency of behaviours by experimentally changing social status between repeated personality assays. We used male domestic fowl (Gallus gallus domesticus), a social species that forms relatively stable dominance hierarchies, and showed that behavioural responses were strongly affected by social status, but also by individual characteristics. The level of vigilance, activity and exploration changed with social status, whereas boldness appeared as a stable individual property, independent of status. Furthermore, variation in vocalization predicted future social status, indicating that individual behaviours can both be a predictor and a consequence of social status, depending on the aspect in focus. Our results illustrate that social states contribute to both variation and stability in behavioural responses, and should therefore be taken into account when investigating and interpreting variation in personality.

Place, publisher, year, edition, pages
2014. Vol. 281, no 1774, 20132531
Keyword [en]
behavioural syndromes, intra-sexual selection, phenotypic plasticity, social dominance, chicken
National Category
Biological Sciences
Research subject
Ethology
Identifiers
URN: urn:nbn:se:su:diva-102797DOI: 10.1098/rspb.2013.2531ISI: 000332380200015OAI: oai:DiVA.org:su-102797DiVA: diva2:713494
Note

AuthorCount:4;

Available from: 2014-04-23 Created: 2014-04-22 Last updated: 2017-05-17Bibliographically approved
In thesis
1. The relationship between personality and social dominance in the domestic fowl – a critical perspective
Open this publication in new window or tab >>The relationship between personality and social dominance in the domestic fowl – a critical perspective
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Social dominance relationships are formed within numerous animal species and reduce costly fights over resources. Dominant individuals often enjoy greater access to important resources such as food and mating partners, and are generally more aggressive, bold, active and explorative compared to subdominant individuals. These behavioural traits can differ among individuals, but they can also be consistent within the individual, thereby describing the individual’s personality type. However, the causal direction of the observed correlation between dominance and personality is not well studied. One possibility is that some personality types have higher chances of obtaining a dominant social position. This would suggest that personality has consequences for fitness. Another possible explanation is that possessing different social positions gives rise to consistent behavioural differences among individuals on various timescales. If social status has a lasting effect on behaviour, social status would constitute a ‘stable state’ that explains some of the diversity of personality types that has been observed in a multitude of animal species. Dominance and personality may also share underlying proximate factors. In this thesis, I investigate the relationship between social dominance and personality using male domestic fowl, Gallus gallus domesticus. The species is group-living with pronounced dominance hierarchies, and dominance increases male access to mating partners. I show that some aspects of personality, exploration, vigilance and in particular aggressiveness, increased a male’s chances of obtaining dominance (paper III, IV, V), and that aggressiveness can be even more important than body weight and ornament size (comb size, paper V) or recent experience of winning or losing (paper IV). Winning a social interaction resulted in an increase in aggressiveness, while a decrease was seen in males that experienced a loss (paper IV). By observing behaviour before and after changes in male dominance relationships, I further show that a recent (2 days earlier) change in social status induced behavioural adjustments to the new social status in activity, exploration and vigilance (paper I). By extending the time of the new social relationship to 3 weeks, I show that such behavioural changes did not continue (paper II). Finally, I show that the social environment during juvenile development had little impact on adult male competitiveness (paper V). Social interactions appear to have several short-term effects on behaviour, but did not contribute significantly to variation and long-term consistency of personality in male fowl. Instead, a male's personality, and in particular his aggressiveness, affected the outcome of dominance interactions. Overall, my studies reveal important consequences of individual differences in behaviour, and contribute to the highly sought-after empirical testing of hypotheses explaining variation in animal personality.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2017. 63 p.
Keyword
aggression, behavioural syndromes, chicken, Gallus gallus domesticus, intra-sexual selection, resource holding potential, social hierarchy, social rank
National Category
Behavioral Sciences Biology
Research subject
Ethology
Identifiers
urn:nbn:se:su:diva-142348 (URN)978-91-7649-838-5 (ISBN)978-91-7649-839-2 (ISBN)
Public defence
2017-06-16, sal E306, Arrheniuslaboratorierna, Svante Arrhenius väg 20 C, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 5: Manuscript.

Available from: 2017-05-22 Created: 2017-05-02 Last updated: 2017-05-18Bibliographically approved

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