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Roberts, J.; Hunter, M.L.; Kacelnik, A. |
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The ground effect and acoustic communication |
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1981 |
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Animal Behaviour. |
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Anim. Behav. |
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29 |
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2 |
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633-634 |
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2123 |
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Povinelli DJ; Nelson KE; Boysen ST |
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Title |
Comprehension of role reversal in chimpanzees: evidence of empathy? |
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1992 |
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Animal Behaviour. |
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Anim. Behav. |
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43 |
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633 |
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Equine Behaviour @ team @ |
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3031 |
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Author |
Mitani, J.C. |
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Title |
Male chimpanzees form enduring and equitable social bonds |
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Journal Article |
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Year |
2009 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
77 |
Issue |
3 |
Pages |
633-640 |
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Keywords |
chimpanzee; Pan troglodytes; social behaviour; social relationship |
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Controversy exists regarding the nature of primate social relationships. While individual primates are frequently hypothesized to form enduring social bonds with conspecifics, recent studies suggest that relationships are labile, with animals interacting only over short periods to satisfy their immediate needs. Here I use data collected over 10 years on a community of chimpanzees, Pan troglodytes, at Ngogo, Kibale National Park, Uganda, to investigate whether male chimpanzees establish long-term social relationships and to determine the factors that affect variation in relationship quality and the stability of social bonds. Kinship and dominance rank influenced the quality of relationships. Maternal brothers and males of the same dominance rank class groomed each other more equitably than did unrelated males and males that were dissimilar in rank. In addition, males that formed strong social bonds groomed more equitably than did males that displayed weaker bonds. Social bonds were stable over time, with relationships in one year predicting those in subsequent years. Kinship and the quality of social relationships affected bond stability. Maternal half siblings and males that groomed each other equitably maintained longer-lasting bonds than did nonkin and males that groomed each other unevenly. Virtually all of the males established at least one enduring relationship with another individual. The most enduring bonds formed between a few pairs of maternal brothers and dyads that maintained balanced grooming interactions. These results indicate that male chimpanzees maintain long-lasting and equitable social bonds whose formation is affected by maternal kinship and the quality of social relationships. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5164 |
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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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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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Galef, B.G. |
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Title |
The adaptive value of social learning: a reply to Laland |
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1996 |
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Animal Behaviour. |
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Anim. Behav. |
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52 |
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3 |
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641-644 |
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refbase @ user @ |
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566 |
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Judge, P.G.; De Waa,l F.B.M. |
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Title |
Rhesus monkey behaviour under diverse population densities: coping with long-term crowding |
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Journal Article |
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1997 |
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Animal Behaviour. |
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Anim. Behav. |
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54 |
Issue |
3 |
Pages |
643-662 |
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A popular view is that high population density promotes behavioural pathology, particularly increased aggression. In contrast, according to a coping model, some primates have behavioural mechanisms (e.g. formal displays, reconciliation and grooming) that regulate social tensions and control the negative consequences of crowding. Seven captive rhesus monkey groups, Macaca mulattawere observed over a wide range of population densities where high-density groups were over 2000 times more crowded than low-density free-ranging groups. As density increased, male rhesus monkeys increased grooming and huddling but did not increase rates of aggression. Females increased all categories of behaviour examined (heavy aggression, mild aggression, formal bared-teeth displays, grooming and huddling), but the increases were not distributed uniformly to all classes of partners. Females increased only grooming, huddling and appeasement displays to males, increased only aggression and huddling with kin and increased all categories of behaviour to non-kin adult females. There were no differences in the percentage of aggressive conflicts reconciled across density conditions. Increased density had different effects on particular relationships. Relationships between females and males were characterized by a coping pattern in which animals modified their behaviour in ways that may decrease aggression under crowded conditions. Female relationships with kin and non-kin were characterized by increases in both aggression and friendly interactions as density increased. The different patterns of response to higher density may reflect different strategies depending on the strength and stability of relationships and the potential consequences if certain relationships are disrupted.1997The Association for the Study of Animal Behaviour |
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Yerkes Regional Primate Research Center and Department of Psychology, Emory University |
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0003-3472 |
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PMID:9299049 |
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refbase @ user @ |
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199 |
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Boesch, C. |
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Title |
Cooperative hunting in wild chimpanzees |
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Year |
1994 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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48 |
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3 |
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653-667 |
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A model for the evolution of cooperation shows that two conditions are necessary for cooperation to be stable: a hunting success rate that is low for single hunters and increases with group size, and a social mechanism limiting access to meat by non-hunters. Testing this model on TaI chimpanzees, Pan troglodytes, showed that (1) it pays for individuals to hunt in groups of three or four rather than alone or in pairs, and (2) cooperation is stable because hunters gain more at these group sizes than cheaters, owing to a meat-sharing pattern in which hunting, dominance and age, in that order, determine how much an individual gets. In addition, hunters provide cheaters (about 45% of the meat eaters) with the surplus they produce during the hunts. Thus, cooperation in Tai male chimpanzees is an evolutionarily stable strategy, and its success allows cheating to be an evolutionarily stable strategy for Tai female chimpanzees. In Gombe chimpanzees, cooperation is not stable, first, because hunting success is very high for single hunters, and second, because no social mechanism exists that limits access to meat by non-hunters. The analysis showed that some assumptions made when discussing cooperation in other social hunters might be wrong. This might downgrade our general perception of the importance of cooperation as an evolutionary cause of sociality. |
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0003-3472 |
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Equine Behaviour @ team @ |
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4715 |
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Author |
Griffin, A.S.; Galef, J., Bennett G. |
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Title |
Social learning about predators: does timing matter? |
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2005 |
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Animal Behaviour. |
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Anim. Behav. |
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69 |
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3 |
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669-678 |
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In Pavlovian conditioning, animals acquire a response to a previously neutral stimulus (conditioned stimulus, CS), such as a light, if that stimulus predicts a biologically important event (unconditioned stimulus, US), such as delivery of food. Learning typically occurs when the CS precedes the US (forward conditioning), and not when the CS follows the US (backward conditioning). In social learning about predators, the predator stimulus is considered to be the CS to which observers acquire avoidance responses after the stimulus has been presented in contiguity with an alarmed demonstrator, the US. We tested the prediction that social learning of response to a predator would occur even if the social alarm cues (the US) appeared before the predatory stimulus (the CS). Carib grackles, Quiscalus lugubris, responded to a familiar predator presented at close range by suppressing alarm calls. Presentation of an unfamiliar avian model (black-and-yellow pigeon) also decreased calling, and this inhibition of calling was enhanced following a training session in which the model stimulus was presented in association with grackle alarm calls. Acquired inhibition of calling was independent of the order of presentation of the model and an alarm chorus. These are the first results to indicate that social acquisition of predator avoidance is not dependent upon a particular temporal relationship between predators and social alarm cues. Evolution may have modified some properties of Pavlovian conditioning to accommodate social learning about potentially dangerous stimuli. |
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refbase @ user @ |
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572 |
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Wittemyer, G.; Getz, W.M. |
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Hierarchical dominance structure and social organization in African elephants, Loxodonta africana |
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2007 |
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Animal Behaviour. |
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Anim. Behav. |
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73 |
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4 |
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671-681 |
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African elephant; between-group competition; Loxodonta africana; nepotism; resource distribution; socioecology; transitive dominance; within-group competition |
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According to the socioecological framework, transitivity (or linearity) in dominance relationships is related to competition over critical resources. When a population is structured into groups, the intensity of between- versus within-group competition influences the form and function of its social organization. Few studies have compared the type and relative intensity of competition at these two levels. African elephants have well-structured social relations, providing an exemplary system for such a study. We report on dominance hierarchies among free-ranging elephants and evaluate the factors that drive their socioecological structure to lie in a region of the three-dimensional nepotism/despotism/tolerance space rarely observed among social species; namely, where non-nepotistic, transitive dominance hierarchies within groups emerge despite kin-based philopatry and infrequent agonistic interactions over widely distributed resources. We found significant transitivity in dominance hierarchies between groups. Dominance relations among the matriarchs of different social groups were primarily age based, rather than driven by physical or group size, and group matriarch rank influenced the dominance relationships among nonmatriarchal females in the population. Our results suggest that between-group dominance relationships induce tolerance among group members, which in combination with high group relatedness, reduces the benefits of nepotism. We postulate that cognitive abilities and high risk of injury in contests enhance winner and loser effects, facilitating the formation of transitive dominance relationships, despite widely distributed resources over which infrequent competition occurs. The interplay of cognitive abilities, winner and loser effects, resource distribution, and within- and between-group dominance relationships may produce behaviour in other strongly social mammals that differs from that predicted by a superficial application of current socioecological models. |
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449 |
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Cameron, E.Z.; Stafford, K.J.; Linklater, W.L.; Veltman, C.J. |
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Suckling behaviour does not measure milk intake in horses, Equus caballus |
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1999 |
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Animal Behaviour. |
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Anim. Behav. |
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57 |
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3 |
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673-678 |
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Studies of parental investment in mammals have frequently used suckling behaviour to estimate energy transfer from mother to offspring, and consequently to measure maternal input. Such studies assume that the more an offspring sucks, the more milk it will receive. This assumption has been questioned, and a review of the literature found little support for it. To test if suckling behaviour provided an accurate index of milk or energy intake we used a radioactive isotope technique to label the milk of thoroughbred mares and to measure milk transfer to foals. We found no significant linear relationship between usual measures of suckling behaviour and milk or energy intake. No behaviours associated with suckling nor with characteristics of mares and foals improved the relationship; only the number of butts associated with each suck episode even approached significance. If we had used suckling behaviour to test theories on differential maternal investment our conclusions would have been in error. For example, female foals tended to suck for longer than males did but there was no difference in the amount of milk transferred. Consequently, we show that measures of suckling behaviour do not adequately predict milk intake in the domestic horse and we suggest that conclusions about differential maternal investment in mammals based on suckling behaviour are likely to be in error. Copyright 1999 The Association for the Study of Animal Behaviour. |
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Ecology Group, Institute of Natural Resources, Massey University |
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PMID:10196058 |
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418 |
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