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Author |
Powell, G.V.N. |
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Title |
Experimental analysis of the social value of flocking by starlings (Sturnus vulgaris) in relation to predation and foraging |
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Journal Article |
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1974 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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22 |
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2 |
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501-505 |
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In groups of ten, indidual starlings, Sturnus vulgaris, spent significantly less time in surveillance than did individuals in smaller groups and responded more quickly than single birds to a flying model hawk. Captive starlings in flocks reduce their individual surveillance efforts, but their combined efforts still enable them to be more effective than single birds in the detection of predators. Foraging behaviour of flocks was observed by placing single starlings with groups of tricoloured blackbirds, Agelaius tricolor; the starlings reduced the time they devoted to surveillance at the same rate as if they were with other starlings. |
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2147 |
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Author |
Schwab, C.; Bugnyar, T.; Schloegl, C.; Kotrschal, K. |
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Title |
Enhanced social learning between siblings in common ravens, Corvus corax |
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Journal Article |
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Year |
2008 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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75 |
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2 |
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501-508 |
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affiliation; cognition; common raven; Corvus corax; siblings; social learning; social relations |
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It has been suggested that social dynamics affect social learning but empirical support for this idea is scarce. Here we show that affiliate relationships among kin indeed enhance the performance of common ravens, Corvus corax, in a social learning task. Via daily behavioural protocols we first monitored social dynamics in our group of captive young ravens. Siblings spent significantly more time in close proximity to each other than did nonsiblings. We subsequently tested birds on a stimulus enhancement task in model-observer dyads composed of both siblings and nonsiblings. During demonstration the observer could watch the model manipulating one particular object (target object) in an adjacent room. After removing the model, the observer was confronted with five different objects including the former target object. Observers from sibling dyads handled the target object for significantly longer periods of time as compared with the other four available objects, whereas observers from nonsibling dyads did not show a preference for the target object. Also, siblings matched the model's decision to cache or not to cache objects significantly more often than did nonsiblings. Hence, siblings were likely to attend to both, the behaviour of the model (caching or noncaching) and object-specific details. Our results support the hypothesis that affiliate relations between individuals affect the transmission of information and may lead to directed social learning even when spatial proximity has been experimentally controlled for. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5300 |
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Albers, P.C.H.; de Vries, H. |
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Title |
Elo-rating as a tool in the sequential estimation of dominance strengths |
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Journal Article |
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2001 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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61 |
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2 |
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489-495 |
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refbase @ user @ |
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858 |
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Author |
Chapais, B.; Girard, M.; Primi, G. |
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Title |
Non-kin alliances, and the stability of matrilineal dominance relations in Japanese macaques |
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Journal Article |
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Year |
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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481-491 |
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Alliances among kin play a major role in a female's acquisition of her mother's dominance rank in many species of cercopithecines. It is noteworthy, however, that kin rarely form coalitions to challenge females from higher-ranking matrilines, and that matrilineal hierarchies are remarkably stable. One possible reason for the rarity of destabilizing coalitions is that members of high-ranking matrilines form alliances against lower ranking ones. In this paper the patterning of aggressive support among non-kin, and its effect on the stability of rank relations are analysed in a captive group of Japanese macaques, Macaca fuscata, composed of three unrelated matrilines. Analysis of the distribution of non-kin interventions in conflicts between matrilines over a 52-month period revealed a clear pattern of preferential support between the two dominant matrilines against the third-ranking one. This pattern was confirmed experimentally. Any member of the two dominant matrilines was unable, individually, to maintain its rank above the third-ranking matriline, but was able to do so in the presence of the other dominant matriline. Non-kin alliances appear to prevent subordinate females from challenging higher ranking females through revolutionary coalitions (formed among subordinates) or through bridging coalitions (formed among individuals ranking above and below the target). Non-kin support is interpreted in terms of cooperation versus reciprocal altruism. |
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refbase @ user @ |
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2863 |
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Bond, A.B.; Kamil, A.C.; Balda, R.P. |
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Title |
Social complexity and transitive inference in corvids |
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Journal Article |
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Year |
2003 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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65 |
Issue |
3 |
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479-487 |
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The social complexity hypothesis asserts that animals living in large social groups should display enhanced cognitive abilities along predictable dimensions. To test this concept, we compared highly social pinyon jays,Gymnorhinus cyanocephalus , with relatively nonsocial western scrub-jays, Aphelocoma californica, on two complex cognitive tasks relevant to the ability to track and assess social relationships. Pinyon jays learned to track multiple dyadic relationships more rapidly and more accurately than scrub-jays and appeared to display a more robust and accurate mechanism of transitive inference. These results provide a clear demonstration of the association between social complexity and cognition in animals. Copyright 2003 Published by Elsevier Science Ltd on behalf of The Association for the Study of Animal Behaviour. |
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Equine Behaviour @ team @ room B 3.029 |
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399 |
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Author |
Manson, J.H. |
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Title |
Male aggression: a cost of female mate choice in Cayo Santiago rhesus macaques |
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1994 |
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Animal Behaviour. |
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Anim. Behav. |
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48 |
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473-475 |
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10.1006/anbe.1994.1262 |
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Equine Behaviour @ team @ |
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4888 |
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Heyes CM |
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Self-recognition in primates: irreverence, irrelevance and irony |
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1996 |
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Animal Behaviour. |
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Anim. Behav. |
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51 |
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470 |
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Equine Behaviour @ team @ |
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3007 |
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Mitchell R |
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Self-recognition, methodology and explanation: a comment on Heyes (1994) |
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1995 |
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Animal Behaviour. |
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Anim. Behav. |
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51 |
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467 |
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Equine Behaviour @ team @ |
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3020 |
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Author |
White, D.J.; Galef Jr, B.G. |
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Title |
Mate choice copying and conspecific cueing in Japanese quail,Coturnix coturnix japonica |
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Journal Article |
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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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2 |
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465-473 |
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1811 |
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Author |
Reale, D.; Festa-Bianchet, M. |
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Title |
Predator-induced natural selection on temperament in bighorn ewes |
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Journal Article |
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2003 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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65 |
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3 |
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463-470 |
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Temperament traits in animals may have important fitness consequences, but have received little attention from ecologists or evolutionary biologists. A few studies have linked variation in temperament with fitness, but none has measured selection on temperament traits. We estimated the strength of selection on female boldness and docility on bighorn sheep ewes, Ovis canadensis. The Ram Mountain population experienced little predation pressure during the first 25 years of study, then 2 years (1997 and 1998) of frequent predation by cougars, Puma concolor, during which adult ewe mortality almost tripled over the long-term average, to 27% a year. During years of high predation, we found moderate selection favouring bold ewes, and age-specific selection on docility. Old ewes appeared more vulnerable to predation than young ewes. In contrast, no evidence of selection on temperament traits was observed during 2 years of low predation (1996 and 1999). These results suggest predator-induced selection favouring bold and nondocile ewes. Leadership was highly correlated with age and may increase the risk of predator encounter. Leadership alone, however, could not explain the higher vulnerability of old ewes to predation. Cougar predation on bighorn sheep occurs sporadically and unpredictably, probably because individual cougars often are prey specialists. Cougar predation may have limited microevolutionary effects on temperament in bighorn sheep, because it mostly affects ewes near the end of their reproductive life span and because of potential countervailing selection on boldness and docility. Copyright 2003 Published by Elsevier Science Ltd on behalf of The Association for the Study of Animal Behaviour. |
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