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Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius)
Includes bibliographical references
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Percy FitzPatrick Institute of African Ornithology
2016
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| _version_ | 1867613257373581312 |
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| access_status_str | Open Access |
| author | Rat, Margaux Emilie Therese |
| author2 | Ryan, Peter G |
| author_browse | Rat, Margaux Emilie Therese Ryan, Peter G |
| author_facet | Ryan, Peter G Rat, Margaux Emilie Therese |
| author_sort | Rat, Margaux Emilie Therese |
| collection | Thesis |
| description | Includes bibliographical references |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/16714 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:15.376Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Percy FitzPatrick Institute of African Ornithology |
| publisherStr | Percy FitzPatrick Institute of African Ornithology |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/16714 Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) Rat, Margaux Emilie Therese Ryan, Peter G Covas, Rita Doutrelant, Claire van Dijk, Rene E Ornithology Includes bibliographical references Sociality and cooperation are universal features of life, yet cooperative societies are highly vulnerable to conflicts-of-interests which may lead to societal collapse. Dominance may function as a central mechanism behind the maintenance of cooperative societies, because it may reduce conflict by the establishment of hierarchies, and may act in concert with kin selection, enforcement or signalling mechanisms to promote cooperation. Yet, the significance of dominance in the evolutionary routes that maintain cooperation remains poorly understood (Chapter 1). Sociable weavers Philetairus socius are highly social, cooperative passerines. The species is particularly prone to conflicts because of their year-round coloniality and thus year round sharing of resources. Using extensive field-data on individual behaviour, I examine in this thesis whether dominance may mitigate conflict and maintain cooperation, and how it may inform our understanding of the evolutionary mechanisms underlying cooperation. In Chapter2, I investigate whether hierarchies and phenotypic traits allowing the assessment of social status may have evolved to mediate conflicts. I show that weavers establish ordered hierarchies within colonies and that the size of a melanin-based plumage trait, the black bib, is correlated to social status. In Chapter 3, experimental manipulation supports my proposition of a status signalling function of the bib. In Chapter 4, I investigate the benefits of achieving high social status and whether these are shared with relatives through nepotism. Both dominants and their offspring gain enhanced access to resources. Dominants had more access to breeding positions, although this was not reflected by increased reproductive success. In Chapter 5, I explore how dominance and kinship predict individual cooperativeness to three tasks, nestling provisioning, nest construction and predator mobbing. I find that both explain variation in cooperativeness, yet some results follow opposite directions, revealing multiple routes to cooperation. Finally, in Chapter 6, I examine how dominance and kinship structure weavers' social network and whether network position are linked to cooperativeness. Social network analyses reveal that more central birds are more, related, dominant and cooperative. Chapter 7 concludes that dominance acts in concert with kinship to promote the societal lifestyle of sociable weavers highlighting the potential significance of dominance in the evolution of cooperation. 2016-02-03T14:24:05Z 2016-02-03T14:24:05Z 2015 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/16714 eng application/pdf Percy FitzPatrick Institute of African Ornithology Faculty of Science University of Cape Town |
| spellingShingle | Ornithology Rat, Margaux Emilie Therese Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| thesis_degree_str | Doctoral |
| title | Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| title_full | Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| title_fullStr | Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| title_full_unstemmed | Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| title_short | Dominance, social organisation and cooperation in the sociable weaver (Philetairus socius) |
| title_sort | dominance social organisation and cooperation in the sociable weaver philetairus socius |
| topic | Ornithology |
| url | http://hdl.handle.net/11427/16714 |
| work_keys_str_mv | AT ratmargauxemilietherese dominancesocialorganisationandcooperationinthesociableweaverphiletairussocius |