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Author |
Keil, N.M., Sambraus, H.H. |
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Title |
“Intervenors” in agonistic interactions amongst domesticated goats |
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Journal Article |
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Year |
1998 |
Publication |
Zeitschrift fur Säugetierkunde |
Abbreviated Journal |
Z. Säugetierk. |
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Volume |
63 |
Issue |
5 |
Pages |
266-272 |
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Keywords |
Behaviour; Domestication; Goat; Intervention; Rank order |
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Abstract |
Social behaviour was observed in individually marked goats in two herds. The goats from one herd (n = 98) were horned, those of the other herd (n = 83) were polled. By recording agonistic interactions within the herds, a dominance index was determined for each animal. In both herds, intervention took place. Intervention is defined as one animal pushing in between two fighters, and thus ending the fight. More cases of intervention took place per individual animal amongst the horned goats than amongst the polled ones. Goats which intervened in fights on several occasions usually had a high dominance index. Members of the herd which were observed intervening only once had an average dominance index in both herds of almost 0.5. In some cases, goats very low in the rank order intervened a fight. Only rarely did the intervenors have a lower dominance index than the two fighters. In 103 cases, the direct dominance relationship between a fighting animal and the intervenor was known. In 95 cases (92.2%), the intervenor was dominant to the herd member in this fight and in just eight cases (7.8%), it was subordinate. It could not be determined what advantage the intervenor gained from its activity. It is possible that, at least in certain cases, a particularly relationship existed between the intervenor and one of the fighters. |
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Call Number |
Equine Behaviour @ team @ |
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5236 |
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Author |
Oakenfull, E.A.; Ryder, O.A. |
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Title |
Mitochondrial control region and 12S rRNA variation in Przewalski's horse (Equus przewalskii) |
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Journal Article |
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Year |
1998 |
Publication |
Animal Genetics |
Abbreviated Journal |
Anim Genet |
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29 |
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6 |
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456-459 |
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Animals; DNA, Mitochondrial/*genetics; Female; *Genetic Variation; Horses/*genetics; Male; Pedigree; RNA, Ribosomal/*genetics |
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Abstract |
Variation in the control region and the 12S rRNA gene of all surviving mitochondrial lineages of Przewalski's horse was investigated. Variation is low despite the present day population being descended from 13 individuals probably representing animals from three different regions of its range. Phylogenetic comparison of these sequences, with sequences for the domestic horse, does not resolve the ancestral status of either horse. |
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Center for Reproduction of Endangered Species, Zoological Society of San Diego, CA 92112, USA |
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English |
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0268-9146 |
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PMID:9883508 |
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Call Number |
Equine Behaviour @ team @ |
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5040 |
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Author |
Oliveira, R. F.; McGregor, P.K.; Latruffe, C. |
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Title |
Know thine enemy: fighting fish gather information from observing conspecific interactions |
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Journal Article |
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Year |
1998 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
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Proc. Roy. Soc. Lond. B Biol. Sci. |
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265 |
Issue |
1401 |
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1045-1049 |
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Many of the signals that animals use to communicate transmit relatively large distances and therefore encompass several potential signallers and receivers. This observation challenges the common characterization of animal communication systems as consisting of one signaller and one receiver. Furthermore, it suggests that the evolution of communication behaviour must be considered as occurring in the context of communication networks rather than dyads. Although considerations of selection pressures acting upon signallers in the context of communication networks have rarely been expressed in such terms, it has been noted that many signals exchanged during aggressive interactions will transmit far further than required for information transfer between the individuals directly involved, suggesting that these signals have been designed to be received by other, more distant, individuals. Here we consider the potential for receivers in communication networks to gather information, one aspect of which has been termed eavesdropping. We show that male Betta splendens monitor aggressive interactions between neighbouring conspecifics and use the information on relative fighting ability in subsequent aggressive interactions with the males they have observed. |
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Equine Behaviour @ team @ |
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2168 |
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Author |
Barton, N. |
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Title |
Evolutionary biology: The geometry of adaptation |
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Journal Article |
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Year |
1998 |
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Nature |
Abbreviated Journal |
Nature |
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395 |
Issue |
6704 |
Pages |
751-752 |
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0028-0836 |
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10.1038/27338 |
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Equine Behaviour @ team @ |
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5469 |
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Author |
Clayton, N.S.; Dickinson, A. |
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Title |
Episodic-like memory during cache recovery by scrub jays |
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Journal Article |
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1998 |
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Nature |
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395 |
Issue |
6699 |
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272-274 |
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The recollection of past experiences allows us to recall what a particular event was, and where and when it occurred1,2, a form of memory that is thought to be unique to humans3. It is known, however, that food-storing birds remember the spatial location4, 5, 6 and contents6, 7, 8, 9 of their caches. Furthermore, food-storing animals adapt their caching and recovery strategies to the perishability of food stores10, 11, 12, 13, which suggests that they are sensitive to temporal factors. Here we show that scrub jays (Aphelocoma coerulescens) remember 'when' food items are stored by allowing them to recover perishable 'wax worms' (wax-moth larvae) and non-perishable peanuts which they had previously cached in visuospatially distinct sites. Jays searched preferentially for fresh wax worms, their favoured food, when allowed to recover them shortly after caching. However, they rapidly learned to avoid searching for worms after a longer interval during which the worms had decayed. The recovery preference of jays demonstrates memory of where and when particular food items were cached, thereby fulfilling the behavioural criteria for episodic-like memory in non-human animals. |
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0028-0836 |
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10.1038/26216 |
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Equine Behaviour @ team @ |
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4788 |
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Author |
Redbo, I.; Redbo-Torstensson, P.; Ödberg, F.O.; Hedendahl, A.; Holm, J. |
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Title |
Factors affecting behavioural disturbances in race-horses |
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Journal Article |
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Year |
1998 |
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Animal Science |
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66 |
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2 |
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475-481 |
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Cited By (since 1996): 30; Export Date: 21 October 2008 |
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Equine Behaviour @ team @ |
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4541 |
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Author |
Byrne, R. W.; Russon, A. E. |
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Title |
Learning by imitation: a hierachical approach |
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Journal Article |
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Year |
1998 |
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Behav. Brain Sci. |
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21 |
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667-721 |
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Equine Behaviour @ team @ |
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5598 |
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Author |
McLaren I.P.L. |
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Title |
Animal Learning and Cognition: A neural network approach |
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1998 |
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Trends in Cognitive Sciences |
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Trends. Cognit. Sci. |
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2 |
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236-236 |
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refbase @ user @ |
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3464 |
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Author |
Vallortigara G. |
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Title |
Minds of Their Own |
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1998 |
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Trends in Cognitive Sciences |
Abbreviated Journal |
Trends. Cognit. Sci. |
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2 |
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118-118 |
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3466 |
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Sutton J.E.; Roberts W.A. |
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Title |
Do pigeons show incidental timing? Some experiments and a suggested hierarchical framework for the study of attention in animal cognition |
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1998 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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44 |
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263-275 |
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refbase @ user @ |
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