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Anderson, W.D.; Summers, C.H. |
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Title |
Neuroendocrine Mechanisms, Stress Coping Strategies, and Social Dominance: Comparative Lessons about Leadership Potential |
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2007 |
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The ANNALS of the American Academy of Political and Social Science |
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Ann Am Acad Polit Soc Sci |
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614 |
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1 |
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102-130 |
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social dominance – authoritarian – Five Factor Model – neurochemistry – neurotransmitters – leadership |
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The authors examine dominance and subordination in the social psychology, political science, and biology literatures. Using Summers and Winberg (2006) as a guide, the authors suggest that extreme dominance or subordination phenotypes--including social dominance orientation and right-wing authoritarianism--are determined by an organism's genetic predispositions, motivations, stress responses, and long-term hormone release and uptake states. The authors offer hypotheses about the likely neurochemical profiles for each of these extreme dominance and subordination phenotypes and suggest two designs that begin to test these hypotheses. |
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Equine Behaviour @ team @ |
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4699 |
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Nicol, C.J. |
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Title |
How animals learn from each other |
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Journal Article |
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2006 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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100 |
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1-2 |
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58-63 |
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Social learning; Chickens; Demonstrators; Dominance |
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This paper explores ways by which animals may learn from one another, using examples drawn mostly from the chicken, an animal for which social learning is likely to be less dangerous than individual learning. In early life, the behaviour of the hen is important in encouraging chicks to peck at edible items. Maternal display not only attracts chicks to profitable food items, but also redirects their attention away from harmful or non-profitable items. Older chicks can enhance their foraging success by observing the behaviour of conspecifics within their own social group. Hens have been trained to perform a novel behaviour (key-pecking for food) by observation of a trained demonstrator bird. Moreover, observers learnt most from watching dominant demonstrators. Thus the ability to learn from others is not `fixed', but depends on the context and the social identity of both the observer and the demonstrator. |
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refbase @ user @ |
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564 |
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Anderson, J.R.; Fornasieri, I.; Ludes, E.; Roeder, J.-J. |
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Social processes and innovative behaviour in changing groups of lemur fulvus |
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1992 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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27 |
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2 |
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101-112 |
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Social learning; Lemur fulvus; Dominance; Individual differences |
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A group of brown lemurs was presented with one or two baited food-boxes requiring a specific type of motor response in order to be opened. Subsequently, four groups containing different combinations of experienced individuals from the original group and naive individuals were tested. Solutions to the problem and access to the food were recorded and considered in relation to social factors. In the original group, two adult males learned to open the boxes, with one male increasingly preventing the other from approaching. In the second group, with the subordinate male and certain females removed, the dominant male tolerated successful performances by a juvenile female. Group 3 consisted of three passive female participants from the original group and a naive female; one of the three original females now became the sole box-opener. The introduction of the subordinate male from the original group into the all-female group led to a sharing of box-opening by this subject and the skilled female. In the final group, intense aggression toward the skilled female by a new, naive adult male resulted in two previously passive females succeeding on some occasions. In lemurs, at least some `scroungers' appear able to learn to perform a new act when the social context permits. |
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refbase @ user @ |
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576 |
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Ostner, J.; Heistermann, M.; Schülke, O. |
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Title |
Dominance, aggression and physiological stress in wild male Assamese macaques (Macaca assamensis) |
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2008 |
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Hormones and Behavior |
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54 |
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5 |
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613-619 |
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Social stress; Dominance; Aggression; Fecal glucocorticoid excretion; Male bonds; Assamese macaques |
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In group-living animals relative rank positions are often associated with differences in glucocorticoid output. During phases of social stability, when dominance positions are clear and unchallenged, subordinates often face higher costs in terms of social stress than dominant individuals. In this study we test this prediction and examine additional potential correlates of stress, such as reproductive season, age and amount of aggression received in wild, seasonally breeding Assamese macaques (Macaca assamensis). During a mating and a non-mating season we collected 394 h of focal observational data and 440 fecal samples of six adult and six large subadult males living in a multimale-multifemale group in their natural habitat in northeastern Thailand. The mating season was characterized by a general increase in aggressive behavior and glucocorticoid excretion across all males compared to the non-mating season. Among adult males, mating season glucocorticoid levels were significantly negatively related with dominance rank and positively with the amount of aggression received. Both relationships were non-significant among large subadult males. Thus, our results suggest that in adult Assamese macaques a high dominance position is not associated with high costs. Low costs of dominance might be induced by strong social bonds among top-ranking males, which exchange frequent affiliative interactions and serve as allies in coalitionary aggression against potentially rank-challenging subordinate males. |
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0018-506x |
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Equine Behaviour @ team @ |
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4694 |
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Heitor, F.; Vicente, L. |
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Title |
Affiliative relationships among Sorraia mares: influence of age, dominance, kinship and reproductive state |
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2010 |
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Journal of Ethology |
Abbreviated Journal |
J. Ethol. |
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28 |
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1 |
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133-140 |
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Sorraia horse – Affiliative relationship – Dominance – Kinship – Reproductive state |
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Abstract Affiliative relationships among mares were examined in a managed group of Sorraia horses, Equus caballus, over a 3-year period. We assessed the influence of age, dominance, kinship and reproductive state on the strength of affiliative relationships and diversity of partners. The herd comprised 9–11 mares that had known each other since birth, their foals and a stallion that remained in the group exclusively during the breeding season. In contrast to a previous study, kinship did not significantly affect bonds. Mares tended to spend more time in proximity to those in the same reproductive state. Affiliative relationships among mares were relatively stable but their strength decreased after foaling, possibly as a function of foal protection and bonding between dam and foal. There was no consistent evidence that mares disengaged from affiliative relationships with increasing age. As expected, dominant mares and barren mares contributed the most to affiliative relationships. Dominance rank increased with age, but dominance relationships were stable and did not change after foaling. Overall, reproductive state was the factor that had the most consistent influence on affiliative relationships among Sorraia mares. |
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Equine Behaviour @ team @ |
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5100 |
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Chaudhuri, M.; Ginsberg, J.R. |
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Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). |
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1990 |
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Journal of Reproduction and Fertility |
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J Reprod Fert |
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88 |
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127-133 |
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zebra; testosterone; androgens; territoriality; social behaviour; dominance |
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In both species of zebra, breeding males had higher urinary androgen concentrations (ng androgens/mg Cr) than did non-breeding bachelor males (30.0 +/- 5.0 (N = 9) versus 11.4 +/- 2.8, (N = 7) in the plains zebra; 19.0 +/- 2.2 (N = 17) versus 10.7 +/- 1.2 (N = 14) in the Grevy's zebra). In the more stable family structure of the plains zebra (single male non-territorial groups) variations in androgen concentrations could not be ascribed to any measured variable. In the Grevy's zebra, androgen values were significantly lower in samples taken from territorial (breeding) males which had temporarily abandoned their territories (N = 4) and the urinary androgen concentration for a male on his territory was negatively correlated with the time since females last visited the territory. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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987 |
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