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	Author	de Waal, F.B.M.; Davis, J.M.
	Title	Capuchin cognitive ecology: cooperation based on projected returns			Type	Journal Article
	Year	2003	Publication	Neuropsychologia	Abbreviated Journal	Neuropsychologia
	Volume	41	Issue	2	Pages	221-228
	Keywords	Animals; Attention; Cebus/psychology; Cooperative Behavior; Decision Making; Dominance-Subordination; Female; Male; Motivation; Reaction Time; Reinforcement Schedule; Social Behavior
	Abstract	Stable cooperation requires that each party's pay-offs exceed those available through individual action. The present experimental study on brown capuchin monkeys (Cebus apella) investigated if decisions about cooperation are (a) guided by the amount of competition expected to follow the cooperation, and (b) made instantaneously or only after a period of familiarization. Pairs of adult monkeys were presented with a mutualistic cooperative task with variable opportunities for resource monopolization (clumped versus dispersed rewards), and partner relationships (kin versus nonkin). After pre-training, each pair of monkeys (N=11) was subjected to six tests, consisting of 15 2 min trials each, with rewards available to both parties. Clumped reward distribution had an immediate negative effect on cooperation: this effect was visible right from the start, and remained visible even if clumped trials alternated with dispersed trials. The drop in cooperation was far more dramatic for nonkin than kin, which was explained by the tendency of dominant nonkin to claim more than half of the rewards under the clumped condition. The immediacy of responses suggests a decision-making process based on predicted outcome of cooperation. Decisions about cooperation thus take into account both the opportunity for and the likelihood of subsequent competition over the spoils.
	Address	Living Links, Yerkes Primate Center, Emory University, 954 N. Gatewood Road, Atlanta, GA 30322, USA. dewaal@emory.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0028-3932	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:12459220			Approved	no
	Call Number	refbase @ user @			Serial	182
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	Author	Seyfarth, R.M.; Cheney, D.L.
	Title	Signalers and receivers in animal communication			Type	Journal Article
	Year	2003	Publication	Annual review of psychology	Abbreviated Journal	Annu Rev Psychol
	Volume	54	Issue		Pages	145-173
	Keywords	Affect; Animal Communication; Animals; Arousal; Auditory Perception; Motivation; Social Behavior; Social Environment; Species Specificity; *Vocalization, Animal
	Abstract	In animal communication natural selection favors callers who vocalize to affect the behavior of listeners and listeners who acquire information from vocalizations, using this information to represent their environment. The acquisition of information in the wild is similar to the learning that occurs in laboratory conditioning experiments. It also has some parallels with language. The dichotomous view that animal signals must be either referential or emotional is false, because they can easily be both: The mechanisms that cause a signaler to vocalize do not limit a listener's ability to extract information from the call. The inability of most animals to recognize the mental states of others distinguishes animal communication most clearly from human language. Whereas signalers may vocalize to change a listener's behavior, they do not call to inform others. Listeners acquire information from signalers who do not, in the human sense, intend to provide it.
	Address	Department of Psychology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. seyfarth@psych.upenn.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0066-4308	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:12359915			Approved	no
	Call Number	refbase @ user @			Serial	690
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	Author	Bolhuis, J.J.
	Title	Bird brains and behaviour: perception, cognition and production			Type	Journal Article
	Year	2003	Publication	Animal Biology	Abbreviated Journal
	Volume	53	Issue	2	Pages	71-72
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	Address
	Corporate Author				Thesis
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	Notes	formerly Netherlands Journal of Zoology			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	3104
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	Author	Waring, G.H.
	Title				Type	Book Whole
	Year	2003	Publication	Horse behavior. 2nd ed	Abbreviated Journal
	Volume		Issue		Pages	442 pp
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	Abstract
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	Notes	Cited By (since 1996): 1; Export Date: 21 October 2008			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	4548
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	Author	McLean, A.N.
	Title				Type	Book Whole
	Year	2003	Publication	The Truth About Horses	Abbreviated Journal
	Volume		Issue		Pages	48-49
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	Notes	Cited By (since 1996): 13; Export Date: 21 October 2008			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	4531
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	Author	Silk, J.B.; Alberts, S.C.; Altmann, J.
	Title	Social Bonds of Female Baboons Enhance Infant Survival			Type	Journal Article
	Year	2003	Publication	Science	Abbreviated Journal	Science
	Volume	302	Issue	5648	Pages	1231-1234
	Keywords
	Abstract	Among nonhuman primates, females often form strong bonds with kin and other group members. These relationships are thought to have adaptive value for females, but direct effects of sociality on fitness have never been demonstrated. We present 16 years of behavioral data from a well-studied population of wild baboons, which demonstrate that sociality of adult females is positively associated with infant survival, an important component of variation in female lifetime fitness. The effects of sociality on infant survival are independent of the effects of dominance rank, group membership, and environmental conditions. Our results are consistent with the evidence that social support has beneficial effects on human health and well-being across the life span. For humans and other primates, sociality has adaptive value.
	Address
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	Notes	10.1126/science.1088580			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	5151
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	Author	Dugatkin, L.A.; Earley, R.L.
	Title	Group fusion: the impact of winner, loser, and bystander effects on hierarchy formation in large groups			Type	Journal Article
	Year	2003	Publication	Behavioral Ecology	Abbreviated Journal	Behav. Ecol.
	Volume	14	Issue	3	Pages	367-373
	Keywords
	Abstract	We present the results of a series of computer simulations that examined the impact of winner, loser, and bystander effects on hierarchy formation in fused groups. These effects and their implications for hierarchy structure and aggressive interactions were first examined in small four-member groups. Subsequent to this, the two small groups were fused into a single larger group. Further interactions took place in this fused group, generating a new hierarchy. Our models demonstrate clearly that winner, loser, and bystander effects strongly influence both the structure and types of interactions that emerge from the fusion of smaller groups. Four conditions produced results in which the same general patterns were uncovered in pre- and postfusion groups: (1) winner effects alone, (2) bystander loser effects alone, (3) winner and bystander winner effects operating simultaneously, and (4) all four effects in play simultaneously. Outside this parameter space, hierarchy structure and the nature of aggressive interactions differed in pre- and postfusion groups. When only loser effects were in play, one of the two clear alphas from the prefused groups dropped in rank in the eight-member fused group. When bystander winner effects were in play, it was difficult to rank any of the eight individuals in the fused group, and players interacted almost exclusively with those that were not in their original four-member group. When loser and bystander loser effects operated simultaneously, two top-ranking individuals emerged in the fused groups, but the relative rank of the other players was difficult to assign.
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	Notes	10.1093/beheco/14.3.367			Approved	no
	Call Number	refbase @ user @			Serial	519
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	Author	Sondergaard, E.; Halekoh, U.
	Title	Young horses' reactions to humans in relation to handling and social environment			Type	Journal Article
	Year	2003	Publication	Applied Animal Behaviour Science	Abbreviated Journal	Appl. Anim. Behav. Sci.
	Volume	84	Issue	4	Pages	265-280
	Keywords	Horses; Human-animal relationship; Social environment; Handling
	Abstract	Forty Danish warmblood colts in two replicates were used to investigate the effect of housing and handling in the rearing period on the reactions to humans. The horses entered the experiment after weaning and were housed either individually (n=16) or in groups of three (n=24). Half of the horses from each housing group were handled three times per week for a period of 10 min. Approach tests were performed in the home environment when the horses were 6, 9, 12, 18, 21, and 24 months old, and an Arena and Human Encounter test was performed in a novel environment when the horses were 12 and 24 months old, respectively. In the home environment, single-housed horses approached sooner and were more easily approached by a human than group-housed horses where no effect of handling was observed. Horses approached sooner and were more easily approached with increasing age. In the Arena and Human Encounter test, single-housed horses expressed less restless behaviour, more explorative behaviour, and less vocalisation than group-housed horses. Handled horses showed lower increase in heart rate during the test than non-handled horses. There was no difference between the number of times single or group-housed horses touched an unfamiliar person in the Arena and Human Encounter test but handled horses approached sooner than non-handled horses. It is concluded that the social environment affected the way horses reacted to humans when tested in the home environment but not in a novel environment. In contrast, handling affected the reactions to humans when tested in the novel environment but not in the home environment. However, handled horses also reacted less to the novel environment in general, thus indicating that handling is a mean of avoiding potential dangerous situations.
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	308
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	Author	Visser, E.K.; Van Reenen, C.G.; Engel, B.; Schilder, M.B.H.; Barneveld, A.; Blokhuis, H.J.
	Title	The association between performance in show-jumping and personality traits earlier in life			Type	Journal Article
	Year	2003	Publication	Applied Animal Behaviour Science	Abbreviated Journal	Appl. Anim. Behav. Sci.
	Volume	82	Issue	4	Pages	279-295
	Keywords	Personality; Performance; Horses; Prediction; Individual differences; Behavioural tests
	Abstract	For a horse to succeed in a show-jumping career, the individual has to possess both excellent physical abilities as well as a suitable personality to perform under challenging conditions. Forty-one Dutch Warmblood horses were used to develop personality tests and correlations between test variables and early training performances in jumping were studied. In behavioural tests, during the first 2 years of the horses' lives, personality aspects like emotionality, reactivity to human and learning abilities were quantified. At the age of 3, horses were broken and received early training in show-jumping. The inter-relationship between several performance variables measured during this early training phase were studied using principal component analysis (PCA). Variables measured in the different personality tests (novel-object test, handling test, avoidance-learning test and a reward-learning test) showed no correlations, suggesting that these tests all triggered different aspects of a horse's personality. This study indicates that it is possible to predict a substantial part of the show-jumping performance of an individual horse later in life by personality traits earlier in life.
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	326
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	Author	Clotfelter, E.D.; Paolino, A.D.
	Title	Bystanders to contests between conspecifics are primed for increased aggression in male fighting fish			Type	Journal Article
	Year	2003	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	66	Issue	2	Pages	343-347
	Keywords
	Abstract	We performed two experiments in which we allowed a male fighting fish, Betta splendens, designated a bystander, to observe aggressive contests between pairs of male conspecifics. Another male (naive male) observed an empty tank or two nonaggressive males, depending on the experiment. Immediately after these observation periods, we allowed the bystander and naive male to interact in a neutral area. In both experiments, bystander males were dominant over naive males in a significant number of the encounters. Bystander males performed significantly more aggressive behaviours (displays, chases and bites) than did naive males. Differences in dominance were not due to chance differences in body size. These findings demonstrate that exposure to aggression between conspecifics increases aggressive motivation in bystander male fighting fish. We discuss briefly the implications of such social experience on the formation of dominance hierarchies. Copyright 2003 Published by Elsevier Ltd on behalf of The Association for the Study of Animal Behaviour.
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	Corporate Author				Thesis
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	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	refbase @ user @			Serial	338
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