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Gammell, M.P.; de Vries, H.; Jennings, D.J.; Carlin, C.M.; Hayden, T.J. |
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David's score: a more appropriate dominance ranking method than Clutton-Brock et al.'s index |
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2003 |
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Animal Behaviour. |
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Anim. Behav. |
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66 |
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3 |
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601-605 |
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Jennings, D.J.; Gammell, M.P.; Carlin, C.M.; Hayden, T.J. |
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Title |
Effect of body weight, antler length, resource value and experience on fight duration and intensity in fallow deer |
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2004 |
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Animal Behaviour. |
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Anim. Behav. |
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68 |
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1 |
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213-221 |
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We tested predictions of evolutionary game theory focusing on fight duration and intensity during contests between European fallow deer, Dama dama L. We examined the relation between contest duration and intensity and resource-holding potential (RHP; body weight and antler size), in an effort to reveal the assessment rules used by competing males. We examined other potential determinants of duration and intensity: resource value (the oestrous female) and experience of agonistic interactions. Asymmetry in body weight or antler length of contestants was not correlated with fight duration. Body weight and antler length of the fight winner or loser were also not correlated with fight duration. Neither were the body weight of the heavier or lighter animal or the antler length of the animal that had longer or shorter antlers. A measure of intensity (the jump clash) was positively related to the body weight of the losing animal and the lighter member of the dyad. These results are consistent with the hypothesis that opponents escalate contest intensity based on assessment of their own ability rather than through mutual assessment. There was no evidence that resource value is an important factor in either fight duration or intensity in this population. As the number of fights between pairs of males increased, there was a decrease in fight duration. Fights were longer when at least one member of a competing pair of males had previously experienced a victory. |
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Jennings, D.J.; Gammell, M.P.; Carlin, C.M.; Hayden, T.J. |
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Is the parallel walk between competing male fallow deer, Dama dama, a lateral display of individual quality? |
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2003 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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65 |
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5 |
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1005-1012 |
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During competitive encounters protagonists are expected to use signals of individual quality particularly if there is a risk of injury or death. Lateral presentation of body profile, by which information regarding phenotypic characteristics associated with individual quality are displayed, may represent such a strategy. During aggressive interactions, male fallow deer frequently engage in parallel walking which is assumed to represent a mutual display of quality, as mediated by exposure of the maximal profile of the body or antlers. We examined the context and role of the parallel walk during competitive encounters to investigate whether there was evidence that dyads of competing males were assessing differences in phenotypic characteristics. There was no evidence to support the hypotheses that the parallel walk is a lateral display of body size or weaponry or that its use is associated with a reduced level of escalated or risky behaviours during fighting. Total time spent fighting was not shorter when a parallel walk was present than when there was no parallel walk. The parallel walk was highly associated with fighting and it was more likely to be initiated by the subsequent loser. Furthermore, parallel walking frequently followed bouts of fighting and as such may represent a strategy that permits an animal the opportunity to decide whether to continue fighting. Parallel walking was also associated with a failure to resolve contests in favour of one animal indicating that it may be a means of withdrawing from further fighting without incurring a loss in dominance status. Copyright 2003 Published by Elsevier Science Ltd on behalf of The Association for the Study of Animal Behaviour. |
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2127 |
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Saunders, F.C.; McElligott, A.G.; Safi, K.; Hayden, T.J. |
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Mating tactics of male feral goats (Capra hircus): risks and benefits |
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2005 |
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Acta Ethol |
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8 |
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Equine Behaviour @ team @ Saunders2005 |
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