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| Author | Bourjade, M.; Thierry, B.; Maumy, M.; Petit, O. | ||||
| Title | Decision-making in Przewalski horses (Equus ferus przewalskii) is driven by the ecological contexts of collective movements | Type | Journal Article | ||
| Year | 2009 | Publication | Ethology | Abbreviated Journal | Ethology |
| Volume | 115 | Issue | 4 | Pages | 321-330 |
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| Abstract | We addressed decision-making processes in the collective movements of two groups of Przewalski horses (Equus ferus przewalskii) living in a semi free-ranging population. We investigated whether different patterns of group movement are related to certain ecological contexts (habitat use and group activity) and analysed the possible decision-making processes involved. We found two distinct patterns; ‘single-bout’ and ‘multiplebout’ movements occurred in both study groups. The movements were defined by the occurrence of collective stops between bouts and differed by their duration, distance covered and ecological context. For both movements, we found that a preliminary period involving several horses occurred before departure. In single-bout movements, all group members rapidly joined the first moving horse, independently of the preliminary period. In multiple-bout movements, however, the joining process was longer; in particular when the number of decision-makers and their pre-departure behaviour before departure increased. Multiplebout movements were more often used by horses to switch habitats and activities. This observation demonstrates that the horses need more time to resolve motivational conflicts before these departures. We conclude that decision-making in Przewalski horses is based on a shared consensus process driven by ecological determinants. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 4801 | ||
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| Author | Sueur, C.; Petit, O. | ||||
| Title | Signals use by leaders in Macaca tonkeana and Macaca mulatta: group-mate recruitment and behaviour monitoring | Type | Journal Article | ||
| Year | 2010 | Publication | Animal Cognition | Abbreviated Journal | Anim. Cogn. |
| Volume | 13 | Issue | 2 | Pages | 239-248 |
| Keywords | Decision-making – Collective movement – Intention – Macaque – Social style – Kinship | ||||
| Abstract | Abstract Animals living in groups have to make consensus decisions and communicate with each other about the time, or the direction, in which to move. In some species, the process relies on the proposition of a single individual, i.e. a first individual suggests a movement and the other group members decide whether or not to join this individual. In Tonkean (Macaca tonkeana) and rhesus macaques (Macaca mulatta), it has been observed that this first individual displays specific signals at departure. In this paper, we aimed to explore the function of such behaviours, i.e. if these behaviours were recruitment signals or only cues about the motivation of the first departed individual. We carried out temporal analyses and studied the latencies of the first departed individual’s behaviours and of the joining of other group members. We also assessed whether the social style of a species in terms of dominance and kinship relationships influenced the patterns of signal emissions. We then analyzed how the first departed individual decided to make a pause or to stop it according to the identities of group members that joined the collective movement. Results showed that Tonkean macaques and rhesus macaques seemed to use back-glances to monitor the joining of other group members and pauses to recruit such individuals. This was especially the case for highly socially affiliated individuals in Tonkean macaques and kin-related individuals in rhesus macaques. Moreover, back-glances and pauses disappeared when such individuals joined the first departed individual. From these results, we suggested that such behaviour could be considered intentional. Such findings could not be highlighted without temporal analyses and accurate observations on primate groups in semi-free ranging conditions. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 5117 | ||
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| Author | Sueur, C.; Petit, O. | ||||
| Title | Organization of Group Members at Departure Is Driven by Social Structure in Macaca | Type | Journal Article | ||
| Year | 2008 | Publication | International Journal of Primatology | Abbreviated Journal | Int. J. Primatol. |
| Volume | 29 | Issue | 4 | Pages | 1085-1098 |
| Keywords | dominance – kinship – Macaca tonkeana – M. mulatta – network metrics – order – movement | ||||
| Abstract | Abstract Researchers have often explained order of progression of group members during joint movement in terms of the influence of ecological pressures but rarely that of social constraints. We studied the order of joining by group members to a movement in semifree-ranging macaques with contrasting social systems: 1 group of Tonkean macaques (Macaca tonkeana) and 1 group of rhesus macaques (M. mulatta). We used network metrics to understand roles and associations among individuals. The way the macaques joined a movement reflected the social differences between the species in terms of dominance and kinship. Old and dominant male rhesus macaques were more often at the front of the movement, contrary to the Tonkean macaques, which exhibited no specific order. Moreover, rhesus macaques preferred to join high-ranking or related individuals, whereas Tonkean macaques based associations during joining mostly on sexual relationships with a subgroup of peripheral males. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 5125 | ||
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| Author | Ramseyer, A.; Petit, O.; Thierry, B. | ||||
| Title | Decision-making in group departures of female domestic geese | Type | Journal Article | ||
| Year | 2009 | Publication | Behaviour | Abbreviated Journal | Behaviour |
| Volume | 146 | Issue | Pages | 351-371 | |
| Keywords | MOVEMENT; COLLECTIVE; PRE-DEPARTURE; RECRUITMENT; ANSER DOMESTICUS | ||||
| Abstract | Group-living animals have to make trade-offs to reach consensus and travel together. We investigated the recruitment processes underpinning decision-making at departure in a group of 20 female domestic geese (Anser domesticus) kept in semi-free-range conditions. Two observers continuously videotaped the behaviours of the birds. Data were analyzed using multiple regression analyses. We found that decision-making was a continuous and distributed process. Departure was preceded by an increase in the arousal state of group members and their initial orientation influenced recruitment. Patterns of group movement could be predicted from the behaviours of individuals before departure. Individuals' locations, moves and signals could act as passive or communicative cues. A higher number of vocalisations and arousal behaviours led to a larger number of individuals recruited. Some individuals were more efficient than others in recruiting followers but any geese could initiate a movement. First movers recruited a higher number of mates when they had a greater number of neighbours. Not only the first mover but also the behaviours of the second and third movers prompted further individuals to follow. There was no evidence that geese were able to intentionally recruit others, rather they synchronized and adjusted each other's motives until reaching a consensus. | ||||
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| Call Number | Equine Behaviour @ team @ | Serial | 5289 | ||
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| Author | Bourjade, M.; Thierry, B.; Hausberger, M.; Petit, O. | ||||
| Title | Is <italic>Leadership</italic> a Reliable Concept in Animals? An Empirical Study in the Horse | Type | Journal Article | ||
| Year | 2015 | Publication | PLoS ONE | Abbreviated Journal | PLoS ONE |
| Volume | 10 | Issue | 5 | Pages | e0126344 |
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| Abstract | <p>Leadership is commonly invoked when accounting for the coordination of group movements in animals, yet it remains loosely defined. In parallel, there is increased evidence of the sharing of group decisions by animals on the move. How leadership integrates within this recent framework on collective decision-making is unclear. Here, we question the occurrence of leadership in horses, a species in which this concept is of prevalent use. The relevance of the three main definitions of leadership – departing first, walking in front travel position, and eliciting the joining of mates – was tested on the collective movements of two semi-free ranging groups of Przewalski horses (<italic>Equus ferus przewalskii</italic>). We did not find any leader capable of driving most group movements or recruiting mates more quickly than others. Several group members often displayed pre-departure behaviours at the same time, and the simultaneous departure of several individuals was common. We conclude that the decision-making process was shared by several group members a group movement (i.e., partially shared consensus) and that the leadership concept did not help to depict individual departure and leading behaviour across movements in both study groups. Rather, the different proxies of leadership produced conflicting information about individual contributions to group coordination. This study discusses the implications of these findings for the field of coordination and decision-making research.</p> | ||||
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| Publisher | Public Library of Science | Place of Publication | Editor | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5992 | ||
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