| Records |
| Author |
Beaugrand, J.P |
| Title |
Relative importance of initial individual differences, agonistic experience, and assessment accuracy during hierarchy formation: a simulation study |
Type |
Journal Article |
| Year |
1997 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
41 |
Issue  |
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Pages |
177-192 |
| Keywords |
Dominance; Hierarchy formation; RHP; Agonistic experience; Assessment; Self-organization; Simulation |
| Abstract |
This simulation study explores some conditions leading to transitivity within dominance orders. Combinations of three parameters were varied to study their consequences upon hierarchy formation and upon the degree of linearity of resultant structures. The factors studied were: (1) the importance of initial resource holding potentials (RHPs); (2) changes brought in RHPs by successive victories and defeats; and (3) accuracy of RHP assessment made by opponents. Results show that initial differences in RHP always lead to perfectly transitive chains whose rank order reflects the importance of initial differences. Even when simulated animals make important errors while assessing each other during round robin tournaments, emerging dominance structures are perfectly linear and ranks obtained in the structure are highly correlated with initial values in RHPs. Moreover, accumulated experiences of victory and/or defeat alone always lead to perfectly linear hierarchies. Their combination with initial individual differences in RHP led to the same conclusion. Even when assessment was far from being perfect, not only perfect chains were formed but initial values in RHPs significantly influenced rank order when the contribution of victory and defeat to RHP was relatively unimportant. The higher the importance of victory and defeat to RHP as compared to that of initial RHP values, the lower was the correlation between initial RHP values and the ranks order reached by individuals in the resultant hierarchies. In general also, the lower the variation within initial RHPs, the lower was the correlation between initial RHPs and ranks in the hierarchy. At a given level of initial RHP dispersion, increasing the contribution of victory and defeat to RHP diminished the correlation between initial RHP values and obtained ranks. In addition, inaccurate assessment reduced the overall correlation, especially when dispersion of initial RHP values was low and the contribution of victory and defeat relatively unimportant. These results shed some light on the controversy about the respective roles of initial individual attributes and that of patterns of resolution in the formation of animal hierarchies. We present the emergence of social order within closed systems as those simulated here as a case of self-organization. |
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Equine Behaviour @ team @ |
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4290 |
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| Author |
Beaugrand, J.P. |
| Title |
Relative importance of initial individual differences, victory and defeat experiences, and assessment accuracy during hierarchy formation: A simulation study |
Type |
Miscellaneous |
| Year |
1997 |
Publication |
Cogprints |
Abbreviated Journal |
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| Volume |
41 |
Issue |
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Pages |
177-192 |
| Keywords |
Dominance; Hierarchy formation; RHP; agonistic experience; Assessment; Self-organization; Simulation |
| Abstract |
This simulation study explores some conditions leading to transitivity within dominance orders. Combinations of three parameters were varied to study their consequences upon hierarchy formation and upon the degree of linearity of resultant structures. The factors studied were (i) the importance of initial Resource Holding Potentials (RHPs) , (ii) changes brought in RHPs by successive victories and defeats, and (iii) accuracy of RHP assessment made by opponents. Results show that initial differences in RHP always lead to perfectly transitive chains whose rank order reflects the importance of initial differences. Even when simulated animals make important errors while assessing each other during round robin tournaments, emerging dominance structures are perfectly linear and ranks obtained in the structure are highly correlated with initial values in RHPs. Moreover, accumulated experiences of victory and/or defeat alone always lead to perfectly linear hierarchies. Their combination with initial individual differences in RHP led to the same conclusion. Even when assessment was far from being perfect, not only perfect chains were formed but initial values in RHPs significantly influenced rank order when the contribution of victory and defeat to RHP was relatively unimportant. The higher the importance of victory and defeat to RHP as compared to that of initial RHP values, the lower was the correlation between initial RHP values and the ranks order reached by individuals in the resultant hierarchies. In general also, the lower the variation within initial RHPs, the lower was the correlation between initial RHPs and ranks in the hierarchy. At a given level of initial RHP dispersion, increasing the contribution of victory and defeat to RHP diminished the correlation between initial RHP values and obtained ranks. In addition, inaccurate assessment reduced the overall correlation, especially when dispersion of initial RHP values was low and the contribution of victory and defeat was high. These results shed some light on the controversy about the respective roles of initial individual attributes and that of patterns of resolution in the formation of animal hierarchies. We present the emergence of social order within closed systems as those simulated here as a case of self-organization. |
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Elsevier |
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Equine Behaviour @ team @ cogprints:1965 |
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4291 |
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| Author |
Suagee-Bedore, J.K.; Linden, D.R.; Bennett-Wimbush, K. |
| Title |
Effect of Pen Size on Stress Responses of Stall-Housed Horses Receiving One Hour of Daily Turnout |
Type |
Journal Article |
| Year |
2021 |
Publication |
Journal of Equine Veterinary Science |
Abbreviated Journal |
J. Equine Vet. Sci. |
| Volume |
98 |
Issue |
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Pages |
103366 |
| Keywords |
Agonistic behaviors; Cortisol; Group turnout; Paddock sizes |
| Abstract |
Group turnout provides important socializing opportunities for horses, particularly those that are primarily stalled. A high percentage of equine injuries occur during group turnout, which could partly be due to the physical constraints of fencing. To investigate appropriate paddock sizes for group turnouts, horses (n = 12) from a single herd were divided into groups of 4, stalled for 24 hours, and then turned out for 1 hour into one of three differently sized pens: 342, 263, and 184 m2 per horse. Groups rotated through pens across 3 days, receiving one treatment per day. Blood was sampled for cortisol concentrations at 08:00 hours each morning, and then at 15 and 60 minutes into the turn out sessions, and 60 minutes after return to individual stalls. Groups rotated through three turnout times: 09:00, 12:00, 14:00 hours. Counts of agonistic behaviors (chasing, contact biting, and kicking) and low-level threats (pinned ears, tail swishing, bite and kick threats) were recorded. When turned out in pens that provided 342 m2 per horse, horses exhibited reduced plasma cortisol concentrations by 15 minutes after turnout and at 1 hour after return to their stalls (P < .05). Horses in pens providing 184 m2 per horse exhibited greater agonistic (P < .001) and low-level threat (P < .01) behaviors than horses in larger pens. These data provide insight into appropriate pen sizes for horses from established herds. Providing at least 342 m2 per horse may reduce the chance of injury in horses accustomed to group turnout. |
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0737-0806 |
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no |
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Equine Behaviour @ team @ |
Serial |
6694 |
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| Author |
Dunbar, R.I.; Dunbar, E.P. |
| Title |
Contrasts in social structure among black-and-white colobus monkey groups |
Type |
Journal Article |
| Year |
1976 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
24 |
Issue |
1 |
Pages |
84-92 |
| Keywords |
Agonistic Behavior; Animals; *Colobus; Copulation; Female; *Haplorhini; *Hierarchy, Social; Male; *Social Dominance |
| Abstract |
Three types of Colobus guereza groups may be distinguished on the bases of size and composition, namely small one-male groups, large, one-male groups and multi-male groups. The social structure of each type of group is described in terms of the distribution of non-agonistic interactions, the frequency and distribution of agonistic behaviour and the organization of the roles of vigilance, territorial defence and leadership. A number of differences are found between the group types which appear to be related to the differences in group size and composition. It is suggested that these group types represent stages in the life-cycle of colobus groups, and that such an interpretation may help to resolve some of the conflicting reports in the literature. |
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0003-3472 |
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| Notes |
PMID:817624 |
Approved |
no |
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Serial |
2049 |
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| Author |
Palagi, E.; Paoli, T.; Tarli, S.B. |
| Title |
Reconciliation and consolation in captive bonobos (Pan paniscus) |
Type |
Journal Article |
| Year |
2004 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
| Volume |
62 |
Issue |
1 |
Pages |
15-30 |
| Keywords |
Aggression/psychology; *Agonistic Behavior; Animals; Animals, Zoo/*psychology; *Conflict (Psychology); *Empathy; Female; Male; Pan paniscus/*psychology; Sex Factors; *Social Behavior; Time Factors |
| Abstract |
Although reconciliation in bonobos (Pan paniscus) has previously been described, it has not been analyzed heretofore by the postconflict (PC) match-control (MC) method. Furthermore, although reconciliation has been investigated before in this species, consolation has not. In this study we analyzed agonistic and affiliative contacts in all sex-class combinations to clarify and reevaluate the occurrence of reconciliation in bonobos via the PC-MC method. We also investigated the occurrence of consolation by analyzing the victims' triadic contact tendency (TCT), the influence of the sex of victims, and the relative occurrence of consolation and reconciliation. We collected 167 pairs of PC-MC observations in a captive group of bonobos (in Apeldoorn, The Netherlands). The conciliatory tendency (CCT) we obtained was tendentially lower than the mean value previously found for Yerkes captive chimpanzees. Close relationships, which were present in all female-female (FF) and some male-female (MF) dyads, positively affected reconciliation rates. When only adult PC-MC pairs (157) were considered, the mean TCTs and CCTs did not differ significantly. When we focused on types of PC affiliative contact, in the case of consolation we found a striking preference for sociosexual patterns. As to the relative occurrence of consolation and reconciliation, the highest level of the former was found in the absence of the latter. When reconciliation took place, consolation generally preceded it, suggesting that consolation may be a substitutive behavior. Our findings suggest that even if reconciliation remains the best option, consolation may be an alternative substitute for reconciliation that is used to buffer the tension originating from an unresolved conflict. Reconciliation and consolation are complex phenomena that are probably related to the life history of a group. Given that few studies have been conducted on this subject, we can not at this time make any generalizations regarding conflict resolution in certain species by comparing results among studies. |
| Address |
Centro Interdipartimentale Museo di Storia Naturale e del Territorio, Universita di Pisa, Pisa, Italy. betta.palagi@museo.unipi.it |
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English |
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0275-2565 |
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| Notes |
PMID:14752810 |
Approved |
no |
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refbase @ user @ |
Serial |
2876 |
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| Author |
Overdorff, D.J.; Erhart, E.M.; Mutschler, T. |
| Title |
Does female dominance facilitate feeding priority in black-and-white ruffed lemurs (Varecia variegata) in southeastern Madagascar? |
Type |
Journal Article |
| Year |
2005 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
| Volume |
66 |
Issue |
1 |
Pages |
7-22 |
| Keywords |
Agonistic Behavior; Animals; Eating/physiology; Feeding Behavior/*physiology; Female; Leadership; Lemuridae/*physiology; Madagascar; Male; Observation; Sex Factors; *Social Dominance |
| Abstract |
Although many Malagasy lemurs are thought to be female dominant and to have female feeding priority, to date the relationship between these behaviors has been rigorously established only in Lemur catta, and other ways that females might achieve feeding priority have not been examined closely. Erhart and Overdorff [International Journal of Primatology 20:927-940, 1999] suggested that one way female primates achieve feeding priority is to initiate and lead groups to food, thereby gaining access to the food first and positively influencing their food intake compared to other group members. Here we describe female dominance patterns and potential measures of feeding priority in two groups of black-and-white ruffed lemurs (Varecia variegata) that were observed over a 15-month period in southeastern Madagascar. We predicted that the females would 1) be consistently dominant to males, 2) lead groups to food sources more often than males, and 3) have higher feeding rates compared to males when they arrived at food sources first. The results were dissimilar between the study groups. During the study, the oldest adult female in group 1 died. There was no evidence for female dominance in this group, and the remaining (likely natal) female did not lead the group more often, nor did she have a higher food intake than males. Group 1 dispersed shortly after the time frame reported here. In contrast, the resident female in group 2 was dominant to group males (based on agonistic interactions), led the group to food sources more often, and experienced a higher food intake when she arrived first at a food source. How these patterns vary over time and are influenced by the number of females in groups, group stability, food quality, and reproductive condition will be examined in future analyses. |
| Address |
Department of Anthropology, University of Texas, Austin, Texas 78712-1086, USA. overdorff@mail.utexas.edu |
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English |
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0275-2565 |
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PMID:15898069 |
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no |
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Equine Behaviour @ team @ |
Serial |
4110 |
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| Author |
Heitor, F.; Vicente, L. |
| Title |
Dominance relationships and patterns of aggression in a bachelor group of Sorraia horses (Equus caballus) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Ethology |
Abbreviated Journal |
J. Ethol. |
| Volume |
28 |
Issue |
1 |
Pages |
35-44 |
| Keywords |
Horse – Equus – Dominance relationship – Rank – Agonistic interaction |
| Abstract |
Abstract The influence of individual factors on dominance rank and the relationship between rank distance and patterns of aggression predicted by models of evolutionarily stable strategies (ESS) of animal conflict were investigated in a managed bachelor group of Sorraia horses, Equus caballus. The group was composed of four to six stallions 3- to 12-years-old during the study period. The dominance hierarchy was significantly linear and rank was not related to age, weight, height or aggressiveness. Frequency and intensity of agonistic interactions were low, but higher-ranking stallions did not receive lower aggressiveness than lower-ranking stallions. There was some evidence that dominance relationships were more contested among close-ranking stallions, as predicted. Agonistic-related interactions among close-ranking stallions served similar functions to those among distant-ranking stallions, but the latter interacted more frequently than expected for access to resting sites and/or resting partners. Therefore, we found some evidence that agonistic-related interactions among distant-ranking stallions play a larger role in providing access to valuable and defendable resources than those among close-ranking stallions. Nevertheless, the fact that space to escape from aggression was limited and breeding access was independent from dominance rank may have reduced the benefits relative to costs of aggression and therefore limited the occurrence of contests over dominance and resources. |
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no |
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Equine Behaviour @ team @ |
Serial |
5099 |
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| Author |
Noë, R.; de Waal, F.B.; van Hooff, J.A. |
| Title |
Types of dominance in a chimpanzee colony |
Type |
Journal Article |
| Year |
1980 |
Publication |
Folia primatologica; international journal of primatology |
Abbreviated Journal |
Folia Primatol (Basel) |
| Volume |
34 |
Issue |
1-2 |
Pages |
90-110 |
| Keywords |
Agonistic Behavior; Animals; Animals, Zoo; *Behavior, Animal; Competitive Behavior; Factor Analysis, Statistical; Female; Hierarchy, Social; Male; *Pan troglodytes; *Social Dominance |
| Abstract |
This study examines to what extent the concept of dominance can be used to describe the social structure of a group of semi-free-living chimpanzees. 15 behavioural variables, based on agonistic, competitive and affinitive behaviour patterns, have been compared with respect to the interindividual directions in which they occurred. In this analysis use was made of indices that reflect the position an individual occupies in the relationship structure. These indices were calculated per individual for all variables and subjected to factor analysis and cluster analysis. As a result, 13 of the variables could be grouped in three categories which have been labelled: (1) agonistic dominance; (2) bluff dominance, and (3) competitive dominance. Whereas the top positions in the hierarchies based on the first two closely related types of dominance were occupied by the adult males, the hierarchy based on the third type was headed by several adult females. |
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English |
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0015-5713 |
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PMID:7439873 |
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no |
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refbase @ user @ |
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212 |
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| Author |
Motch, S.M.; Harpster, H.W.; Ralston, S.; Ostiguy, N.; Diehl, N.K. |
| Title |
A note on yearling horse ingestive and agonistic behaviours in three concentrate feeding systems |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
106 |
Issue |
1-3 |
Pages |
167-172 |
| Keywords |
Horse; Feeding; Agonistic behaviour; Social behaviour; Sex differences |
| Abstract |
The objective of this study was to compare behaviours of yearling horses fed concentrates under each of three management systems. Over two consecutive years, 16 yearling horses (n = 8/year; 4 fillies, 4 geldings, full siblings between years) were observed over a 60-day trial period/year at 15:30 h each day. The experimental design consisted of three factors (sex, feeder type, and year); repeated measures on feeder type: tire feeders (control system), individual tub feeders, and manger feeders. Frequency of agonistic interaction was affected by feeder type and sex. Fillies performed more than three times the total number of agonistic behaviours per feeding session as geldings. In both years, horses spent the most time eating and had the fewest agonistic interactions when fed in tire feeders. |
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Admin @ knut @ |
Serial |
4342 |
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| Author |
Clutton-Brock, T.H.; Greenwood, P.J.; Powell, R.P. |
| Title |
Ranks and relationships in Highland ponies and Highland Cows |
Type |
Journal Article |
| Year |
1976 |
Publication |
Zeitschrift für Tierpsychologie |
Abbreviated Journal |
Z. Tierpsychol. |
| Volume |
41 |
Issue |
2 |
Pages |
202-216 |
| Keywords |
Agonistic Behavior; Animals; *Cattle; Female; Grooming; *Horses; Male; *Social Dominance; Spatial Behavior |
| Abstract |
Recent studies of primates have questioned the importance of dominance hierarchies in groups living under natural conditions. In a herd of Highland ponies and one of Highland cattle grazing under free-range conditions on the Isle of Rhum (Inner Hebrides) well defined hierarchies were present. The provision of food produced a marked increase in the frequency of agonistic interactions but had no effect on the rank systems of the two herds. While rank was clearly important in affecting the distribution of agonistic interactions, it was poorly related to behaviour in non-agonistic situations. |
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English |
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0044-3573 |
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PMID:961125 |
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no |
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refbase @ user @ |
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661 |
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