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| Author |
Maynard Smith, J.; Price, G.R. |
| Title |
The Logic of Animal Conflict |
Type |
Journal Article |
| Year |
1973 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
246 |
Issue |
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Pages |
15-18 |
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10.1038/246015a0 |
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no |
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Equine Behaviour @ team @ |
Serial |
4844 |
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| Author |
Parker, G.A.; MacNair, M.R. |
| Title |
Models of parent-offspring conflict. I. Monogamy |
Type |
Journal Article |
| Year |
1978 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
26 |
Issue |
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Pages |
97-110 |
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| Abstract |
Theoretical models for Trivers (1974) concept of parent-offspring conflict are examined for species in which the effects of the conflict are felt by full sibs. A rare conflictor gene will spread if Image , whereÆ’(m) is the fitness gained by a conflictor relative to a non-conflictor offspring (Æ’(m) >1), and m is the amount of parental investment taken by a conflictor relative to m = 1 for a non-conflictor. The range of m alleles which can spread against the parent optimum decreases as the cost to the parent increases until a point is reached where there is no conflict of evolutionary interests. There would be no polymorphism for conflictor: non-conflictor alleles unless special conditions prevail. The conflictor allele which spreads most rapidly as a rare mutant against the parental optimum is not an evolutionarily stable strategy (ESS). The ESS for parent-offspring conflict in monogamous species has m0 = Æ’(m0)/2[dÆ’(m0)/dm0]. The analytical solutions are confirmed throughout by simulations. |
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10.1016/0003-3472(78)90009-X |
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no |
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Equine Behaviour @ team @ |
Serial |
4901 |
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| Author |
Leonard, M.L.; Horn, A.G.; Eden, S.F. |
| Title |
Parent-offspring aggression in moorhens |
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Journal Article |
| Year |
1988 |
Publication |
Behav. Ecol. Sociobiol. |
Abbreviated Journal |
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| Volume |
23 |
Issue |
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Pages |
265-270 |
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The purpose of this study was to explain parental aggression to offspring in the moorhen (Gallinula chloropus). Males and females did not feed different subsets of chicks. In addition, there was a positive correlation between feeding rates of each parent to a particular chick and the number of attacks (tousles) directed to that chick, contrary to what was expected if aggression served to divide the brood. In moorhens, large chicks outcompeted small chicks for parental feedings. However, adults were more aggressive to large chicks and as a result small chicks spent significantly more time closer to parents and received more feedings than large chicks. In 84% of broods every chick was attacked at least once, although large chicks were attacked more often than small chicks. The behaviour of chicks changed immediately after an attack (Table 2). Before an attack chicks were <1 m from the parents while after an attack they were >1 m. The apparent effect of parental aggression in moorhens is to reduce demands by chicks for feedings. Aggression appears to reduce sibling competition and to encourage chick independence. |
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10.1007/Bf00302949 |
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no |
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Equine Behaviour @ team @ |
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4905 |
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| Author |
Fraser, N.O.; Schino,G.; Aureli, F.F |
| Title |
Components of Relationship Quality in Chimpanzees |
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Journal Article |
| Year |
2008 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
114 |
Issue |
9 |
Pages |
834-843 |
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| Abstract |
A novel approach to studying social relationships in captive adult chimpanzees (Pan troglodytes) was taken by using principal components analysis (PCA) to extract three key components of relationship quality from nine behavioural variables. Based on the loadings of the behavioural variables, the components appeared to match previously hypothesized critical aspects of social relationships and were therefore labelled Value, Compatibility and Security. The effects of kinship, sex combination, age difference and time spent together on each of the relationship quality components were analysed. As expected, kin were found to have more valuable, compatible and secure relationships than non-kin. Female2013female dyads were found to be more compatible than male2013male or mixed-sex dyads, whereas the latter were found to be most secure. Partners of a similar age were found to have more secure and more valuable relationships than those with a larger age gap. Individuals that were together in the group for longer were more valuable and more compatible, but their relationships were found to be less secure than individuals that were together in the group for a shorter time. Although some of the results may be unexpected based on chimpanzee socio-ecology, they fit well overall with the history and social dynamics of the study group. The methods used confer a significant advantage in producing quantitative composite measures of each component of relationship quality, obtained in an objective manner. These findings therefore promote the use of such measures in future studies requiring an assessment of the qualities of dyadic social relationships. |
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no |
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Equine Behaviour @ team @ |
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4936 |
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| Author |
Parker, G.A. |
| Title |
Assessment strategy and the evolution of fighting behaviour |
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Journal Article |
| Year |
1974 |
Publication |
Journal of Theoretical Biology |
Abbreviated Journal |
J. Theor. Biol. |
| Volume |
47 |
Issue |
1 |
Pages |
223-243 |
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| Abstract |
The view is examined that the adaptive value of conventional aspects of fighting behaviour is for assessment of relative RHP (resource holding power) of the combatants. Outcomes of aggressive disputes should be decided by each individual's fitness budget available for expenditure during a fight (determined by the fitness difference between adoption of alternative strategies, escalation or withdrawal without escalation) and on the rate of expenditure of the fitness budget if escalation occurs (determined by the RHPs of the combatants). Thus response thresholds for alternative strategies (“assessments”) will be determined by natural selection on a basis of which opponent is likely to expend its fitness budget first, should escalation occur. This “loser” should retreat (before escalation) and the winner should stay in possession of the resource. Many aggressive decisions depend on whether one is a resource holder, or an attacker. Assuming the RHP of the combatants to be equal, there are many instances of fitness pay-off imbalances between holder and attacker which should weight the dispute outcome in favour of one or other opponent by allowing it a greater expendable fitness budget. Usually the weighting favours the holder; the attacker therefore needs a correspondingly higher RHP before it may be expected to win. This is not invariably the case, and much observed data fits the predictions of this sort of model. If assessments are perfect and budget expenditure rates exactly predictable, then there would never seem to be any case for escalation. Escalation can be explained in terms of injury inflictions (expenditures) occurring as discrete events; i.e. as “bouts” won or lost during fighting. Assessment can give only a probabilistic prediction of the outcome of a bout. A simple model is developed to investigate escalation situations. Each combatant assesses relative RHP; this correlates with an absolute probability of winning the next bout (cabs). The stake played for is infliction of loss of RHP and is determined by the fitness budgets of the opponents. (Each individual plays for the withdrawal of its opponent.) This defines a critical probability of winning (ccrit) for each combatant, above which escalation is the favourable strategy (cabs > ccrit) and below which withdrawal is favourable (cabs < ccrit). Escalation should occur only where cabs-ccrit is positive for both combatants. This model gives predictions compatible with the observations, indicating that RHP loss alone can be adequate to explain withdrawal: escalation behaviour. Withdrawal tendency will be increased by low searching costs. Escalations should be restricted to closely matched RHP opponents if RHP disparity is the major imbalance. Outside the “escalation range” of a given individual, the higher RHP individual wins and the lower one loses (i.e. it should withdraw after conventional display). RHP disparity and holder: attacker imbalance should both interact to shape the observed pattern, though their relative importances will depend on species and situation. In some instances selection may favour immediate withdrawal from an occupied territory even without assessment of RHP. |
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0022-5193 |
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no |
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Equine Behaviour @ team @ |
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4935 |
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Rappolt, G. A.; John, J.; Thompson, N. S. |
| Title |
Canine responses to familiar and unfamiliar humans |
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Journal Article |
| Year |
1979 |
Publication |
Aggressive Behavior |
Abbreviated Journal |
Aggressive Behavior |
| Volume |
5 |
Issue |
2 |
Pages |
155-161 |
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Dogs were observed during controlled approaches by their owners and by strangers. Significant differences between the dogs' responses to their owners and their responses to strangers were found. These results supported the popular belief that dogs respond differently to different persons, and not merely to different situations in which persons are usually encountered. |
| Address |
Departments of Biology and Psychology, Clark University, Worcester, Massachusetts DOI – 10.1002/1098-2337(1979)5 – 2<155 – - AID-AB2480050206>3.0.CO;2-D |
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Copyright © 1979 Wiley-Liss, Inc., A Wiley Company |
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no |
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Equine Behaviour @ team @ |
Serial |
4978 |
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Breuer, K.; Hemsworth, P.H.; Coleman, G.J. |
| Title |
The effect of positive or negative handling on the behavioural and physiological responses of nonlactating heifers |
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Journal Article |
| Year |
2003 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
84 |
Issue |
1 |
Pages |
3-22 |
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Dairy heifer; Fear; Handling; Stress response; Milk production; Stimulus generalisation |
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This experiment investigated the effects of positive and negative tactile handling on the stress physiology and behaviour of dairy heifers. Forty-eight 5-14-month-old nonlactating Holstein-Friesian heifers were allocated to one of two handling treatments, either positive or negative tactile handling, over four time replicates. Handling was imposed twice daily, 2-5 min per session and involved moving animals individually along a 64 m outdoor route. The negatively handled heifers took longer to approach within 1 and 2 m of a stimulus person in a standard test, than their positively handled counterparts (P<0.001) and had a greater flight distance to an approaching stimulus (P<0.001). The time taken by the heifers to approach within 1 and 2 m of a familiar person was similar to that taken to approach within 1 and 2 m of an unfamiliar person in the standard test (P<0.05). There was a tendency for heifers to have a greater flight distance from the approaching unfamiliar person than from the approaching familiar person (P=0.06). The negatively handled heifers had greater (P<0.05) increases in total cortisol concentrations 5, 10 and 15 min after exposure to a human and had higher (P<0.05) free cortisol concentrations in the afternoon than the positively handled heifers. It is concluded that the nature of the human contact affects the subsequent behavioural response of heifers to humans. This behavioural response may extend to other humans through the process of stimulus generalisation, although there was some evidence of moderate discrimination. Negative handling results in an acute stress response in the presence of humans and also leads to a chronic stress response. Further research into the effect of these stress responses on milk production and welfare in fearful cows in a commercial situation is suggested. |
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0168-1591 |
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no |
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Equine Behaviour @ team @ |
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4980 |
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| Author |
Raquel Monclús; Heiko G. Rödel |
| Title |
Influence of Different Individual Traits on Vigilance Behaviour in European Rabbits |
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Journal Article |
| Year |
2009 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
115 |
Issue |
8 |
Pages |
758-766 |
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An animal's level of vigilance depends on various environmental factors such as predator presence or the proximity of conspecific competitors. In addition, several individual traits may influence vigilance. We investigated the effects of body condition, social rank and the state of pregnancy on individual vigilance (scanning) rates in individually marked European rabbits (Oryctolagus cuniculus) of a field enclosure population. We found lower rates in young rabbits than in adult females, but male and female juveniles did not differ. Vigilance of juveniles was positively correlated with their age-dependent body mass (used as a measure of body condition), i.e. young rabbits with lower body condition scanned less. We suggest that juveniles with low body condition were trading off vigilance against feeding to maximise their growth. In contrast, there was no significant correlation between body mass and vigilance in adult females. Adult females increased scanning rates during late pregnancy, which might constitute a behavioural compensation because of their lower capacity to escape predator attacks. In addition, adult females with low social ranks scanned more than high ranking individuals, likely because of their higher risk of attacks by conspecifics. In summary, our results highlight various individual characteristics that influence vigilance behaviour in European rabbits. |
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Unidad de Zoologa, Dpto. Biologa, Universidad Autnoma de Madrid, Madrid, Spain; Department of Animal Physiology, University of Bayreuth, Bayreuth, Germany |
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© 2009 Blackwell Verlag GmbH |
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Equine Behaviour @ team @ |
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4994 |
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| Author |
King, A.J.; Cowlishaw, G. |
| Title |
Leaders, followers and group decision-making |
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Journal Article |
| Year |
2009 |
Publication |
Communicative & Integrative Biology |
Abbreviated Journal |
Commun Integr Biol |
| Volume |
2 |
Issue |
2 |
Pages |
147-150 |
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| Abstract |
Social animals have to make a multitude of group decisions on a daily basis. At the most basic level, this will involve coordination of activities and travel directions. In groups of insects, birds and fish, much of this 'coordination' can be the result of relatively simple interaction patterns among group members. Such systems are self-organizing, and often do not require specific leaders, or followers. However, in more socially complex groups, achieving collective group action-a consensus-may not be accomplished by simple rules alone. Instead, a consensus may be reached by the averaging of preferences (democracy), or by following the choices of specific leaders (despotism). In this mini-review, we discuss the conditions necessary for despotism in animal groups, and focus upon new studies investigating coordinated actions in primates. We ask how specific leaders arise and why others follow them-providing new insight into the mechanisms of effective leadership in groups characterized by strong social relationships. |
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Institute of Zoology; Zoological Society of London; London, UK |
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English |
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1942-0889 |
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PMID:19513268 |
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yes |
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Equine Behaviour @ team @ |
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4998 |
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Gallese, V.; Fadiga, L.; Fogassi, L.; Rizzolatti, G. |
| Title |
Action recognition in the premotor cortex |
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Journal Article |
| Year |
1996 |
Publication |
Brain |
Abbreviated Journal |
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| Volume |
119 |
Issue |
2 |
Pages |
593-609 |
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action encoding; visual responses; premotor cortex; macaque monkey |
| Abstract |
We recorded electrical activity from 532 neurons in the rostral part of inferior area 6 (area F5) of two macaque monkeys. Previous data had shown that neurons of this area discharge during goal-directed hand and mouth movements. We describe here the properties of a newly discovered set of F5 neurons ( mirror neurons', n = 92) all of which became active both when the monkey performed a given action and when it observed a similar action performed by the experimenter. Mirror neurons, in order to be visually triggered, required an interaction between the agent of the action and the object of it. The sight of the agent alone or of the object alone (three-dimensional objects, food) were ineffective. Hand and the mouth were by far the most effective agents. The actions most represented among those activating mirror neurons were grasping, manipulating and placing. In most mirror neurons (92%) there was a clear relation between the visual action they responded to and the motor response they coded. In [~]30% of mirror neurons the congruence was very strict and the effective observed and executed actions corresponded both in terms of general action (e.g. grasping) and in terms of the way in which that action was executed (e.g. precision grip). We conclude by proposing that mirror neurons form a system for matching observation and execution of motor actions. We discuss the possible role of this system in action recognition and, given the proposed homology between F5 and human Brocca's region, we posit that a matching system, similar to that of mirror neurons exists in humans and could be involved in recognition of actions as well as phonetic gestures. |
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10.1093/brain/119.2.593 |
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Equine Behaviour @ team @ |
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5012 |
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