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Author |
Appleby, M.C. |
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Title |
The probability of linearity in hierarchies |
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Year |
1983 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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31 |
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2 |
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600-608 |
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The common practice of ranking a group of animals in the closest possible order to a linear dominance hierarchy assumes that dominance among those animals is generally transitive. In fact, analysis of groups in which dominance relationships are random shows that this method has a surprisingly high probability of producing an apparently linear or near-linear hierarchy by chance. As such, the existence of transitive dominance should be tested before it is used in ranking. A suitable statistical test is described here. Chance may also contribute to the linear appearance of hierarchies based on other factors. |
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Equine Behaviour @ team @ |
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4286 |
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Author |
McFarland, D.J. |
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Roger L. Mellgren, Editor, Animal Cognition and Behavior, North-Holland, Amsterdam (1983), p. xi |
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Journal Article |
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1984 |
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Animal Behaviour. |
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Anim. Behav. |
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32 |
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2 |
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634-635 |
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Equine Behaviour @ team @ |
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2925 |
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Author |
Poisbleau, M.; Fritz, H.; Valeix, M.; Perroi, P.-Y.; Dalloyau, S.; Lambrechts, M.M. |
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Title |
Social dominance correlates and family status in wintering dark-bellied brent geese, Branta bernicla bernicla |
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Journal Article |
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Year |
2006 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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71 |
Issue |
6 |
Pages |
1351-1358 |
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In many gregarious species, including ducks and geese, being dominant provides more benefits than costs, because dominants have better access to resources essential for survival or reproduction. In geese, being in better body condition during migration towards the breeding grounds positively influences reproductive success. However, underlying proximate mechanisms linking prebreeding body condition on the wintering grounds to breeding success remain poorly understood. We investigated social dominance correlates and family status, in three consecutive winters, in a free-ranging, migrating, dark-bellied brent goose population. Families with juveniles dominated pairs, and pairs dominated singletons. Dominance rank did not increase with the number of juveniles per family. Males were dominant over females. Social dominance and reproductive status for a given winter were significantly correlated with body mass, body size and body condition during the previous winter, suggesting that body condition in winter also affects subsequent breeding success and hence also dominance. Levels of testosterone and triiodothyronine were not correlated with immediate or later dominance or reproductive status. We discuss the role of family status as a signal of social status in determining reproductive strategies. |
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0003-3472 |
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Equine Behaviour @ team @ |
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4690 |
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Author |
Boesch, C. |
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Title |
Teaching among wild chimpanzees |
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1991 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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41 |
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3 |
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530-532 |
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0003-3472 |
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Equine Behaviour @ team @ |
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4707 |
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Rutberg, A.T.; Greenberg, S.A. |
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Title |
Dominance, aggression frequencies and modes of aggressive competition in feral pony mares |
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1990 |
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Animal Behaviour. |
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Anim. Behav. |
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40 |
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2 |
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322-331 |
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Feral pony mares, Equus caballus, at Assateague Island, Maryland, formed linear dominance hierarchies within bands. Generally, older mares dominated younger mares, and larger mares dominated smaller mares. Large mares initiated aggression more often than small mares when age was controlled for but, surprisingly, older mares initiated aggression less often than younger mares when size was controlled for. Thus, mares peak in aggressiveness fairly soon after achieving full size and then, while maintaining or improving their rank in the domainance hierarchy, progressively reduce their involvement in aggression as they grow older, Involvement in aggression per mare increased as number of mares in the group increased; this effect was independent of nearest-mare distances. Frequency of involvement in aggression did not differ between mares that had changed bands within the year and mares whose band association had continued for a year or more. Aggression was directed more frequently than expected at subordinate mares who were nursing, and also occurred more frequently than expected at water holes. The proportion of aggressive encounters during grazing closely matched the total proportion of time spent grazing. Subordinate mares with foals received aggression more often than subordinate mares without foals. The high frequency of aggression associated with foals and nursing suggests that interference with reproduction of subordiantes is an important mode of competition between mares. Such interference may be common in animals that feed on dispersed resources and live in small, cohesive groups. |
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refbase @ user @ |
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755 |
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Author |
Janson, C.H. |
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Title |
Ecological consequences of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
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Journal Article |
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Year |
1990 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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40 |
Issue |
5 |
Pages |
922-934 |
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Individuals in a foraging group of brown capuchin monkeys choose different spatial positions relative to the rest of the group. An individual's choice of spatial positiion affects its foraging success and perceived predation risk (as measured by vigilance behaviour). The two most dominant group members preferred to forage where their expected forwaging success was greatest. Juveniles chose to forage where their perceived predation risk was least, not where they would achieve the highest foraging success. The positions used by non-dominant adults neither maximized foraging success nor minimized predation risk. It is likely that subordinate adults accept spatial positions with suboptimal ecological consequences to avoid the costs of frequent confrontations with the dominant members of the group over foraging sites in poreferred positions. |
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refbase @ user @ |
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774 |
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Author |
Janson, C.H. |
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Title |
Social correlates of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
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Journal Article |
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Year |
1990 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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40 |
Issue |
5 |
Pages |
910-921 |
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Individuals in a foraging group of wild bronwn capuchin monkeys choose different spatial positions relative to the rest of the group. Markov analysis of sequencess of individual spatial positions demonstrated significant differnces between individuals, which coul be categorized a posteriori into four homogenous subgroups. An individual's spatial position was related primarily to the amount of aggression it received from the group's dominant male, but also varied with its sex. Spatial choice varied with changes in an individual's social status, but did not vary consistently with seasonal differences in food availability. These results support the hypothesis that individuals compete for preferred spatial positions within a foraging group. |
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refbase @ user @ |
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773 |
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Giraldeau, L.-A.; Lefebvre, L. |
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Title |
Scrounging prevents cultural transmission of food-finding behaviour in pigeons |
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Journal Article |
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1987 |
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Animal Behaviour. |
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Anim. Behav. |
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35 |
Issue |
2 |
Pages |
387-394 |
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Living in groups should promote the cultural transmission of a novel behaviour because opportunities for observing knowledgeable individuals are likely to be more numerous in this condition. However, in this study pigeons who shared the food discoveries of others (scroungers) did not learn the food-finding technique used by the discoverers (producers). Individually-caged pigeons prevented from scrounging easily learned the technique from a conspecific tutor. When caged pigeons obtained food from the tutor's performance, most naïve observers failed to learn. In a flock, scroungers selectively followed producers. In individual cages, scrounging during the tutor's demonstration was equivalent to getting no demonstration at all. This effect of scrounging did not interfere with subsequent acquisition of the food-finding behaviour when scrounging was no longer possible. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5265 |
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Author |
Hemelrijk, C.K. |
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Models of, and tests for, reciprocity, unidirectionality and other social interaction patterns at a group level |
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1990 |
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Animal Behaviour. |
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Anim. Behav. |
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39 |
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6 |
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1013-1029 |
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Research on reciprocity is impaired by confusing definitions and often wrongly used statistical tests. Here, two models of the mechanism on which reciprocity may be based are discussed and an initial step towards a new fremework for its analysis is presented. A distinction is made between reciprocity and interchange. In the case of reciprocity, for one kind of act the same kind is received in return. In interchange, however, two different kinds of acts are bartered. Three types of reciprocity/interchange in social actions among all pairs of group-members are distinguished ([`]qualitative', [`]relative' and [`]absolute') on the basis of the precision of the reciprocity/interchange. Permutation procedures for association between matrices (such as the Mantel Z and two other newly derived tests) are used as a statistical test for detecting reciprocity/interchange. A rough comparison of the power of the two new tests is included. The tests can be applied to all kinds of group-living animals and to all sorts of social behaviour. The distinction between the three types of reciprocity/interchange and the matching statistical methods are also useful for defining and detecting other patterns in social interactions, like unidirectionality and associations between different kinds of social behaviour. The influence on social interactions of variables like dominance rank, age and sex can be analysed in the three forms by testing correlations between invented matrices which represent the influence of these variables (the so-called hypothesis matrices) and social interaction matrices. These methods are extended for two categories of individuals, thus allowing the investigation of, for example, reciprocity between males and females. The methods are illustrated with examples of coalition formation and grooming behaviour among captive chimpanzees, Pan troglodytes. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5049 |
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Eccles, T.R.; Shackleton, D.M. |
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Correlates and consequences of social status in female bighorn sheep |
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1986 |
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Animal Behaviour. |
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Anim. Behav. |
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34 |
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5 |
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1392-1401 |
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Dominance-subordinance relationships among a captive group of adule bighorn sheep (Ovis canadensis californiana) were studied from May 1977 to December 1978. Social interactions between females were brief in duration and infrequent. Although a dominance hierarchy was evident among the females, it was not linear. Horn length and body weight were not consistently correlated with social status. The highest ranking females were the most aggressive individuals, initiating more agonistic interactions than subordinates. Females with high social status did not have higher quality diets, lower activity costs, or higher productivity than low ranking females. |
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refbase @ user @ |
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753 |
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