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| Author |
van Dierendonck, M.C.; Bandi, N.; Batdorj, D.; Dugerlham, S.; Munkhtsog, B. |
| Title |
Behavioural observations of reintroduced Takhi or Przewalski horses (Equus ferus przewalskii) in Mongolia |
Type |
Journal Article |
| Year |
1996 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
50 |
Issue |
2 |
Pages |
95-114 |
| Keywords |
Horse; Przewalski's horse; Reintroduction; Time budget; Social organisation; Basic reference dataset |
| Abstract |
During 1992 and 1993, 14 reintroduced Przewalski Horses or Takhi (Equus ferus przewalskii) were studied in the Hustain Nuruu Mountain Steppe reserve in Mongolia. Most of the individuals did not know each other before reintroduction. These Takhi were the first of five groups due to be released in the reserve after an acclimatisation period of at least 1 year. During acclimatisation the Takhi, lived visually and acoustically separately, in fenced enclosures of approximately 45 ha each. The observations, mostly scan-sampling, were carried out in each season. The observation bouts were divided over six periods and over two harem herds. Two of the periods were in the same consecutive seasons, so comparison over the years was possible. Social integration within the Takhi herds was very high from the beginning, as described by the spatial relation and synchronisation data. Between 50 and 89% of the observation time, the behaviour of all herd members was synchronised. The amount of time spent grazing by the Takhi (30-68% of the daylight period) was similar to that of feral horses and Takhi in captivity and semi-reserves. The Takhi tended to rest in the morning and have a bimodal period of grazing at dawn and in the afternoon. The Takhi displayed clear habitat preferences for certain activities. They had a strong preference to rest at the highest point in their enclosure. They fed preferably on two or three different vegetation types (with five types available in each enclosure). The amount of time spent grazing during the non-growing seasons (49 +/- 15%) indicates that the feeding value and availability of food were sufficient. Health changes were detected adequately using condition scoring sheets. No supplementary food or water was supplied during the harsh winters. Moreover, low mortality rates and high reproductive success show that the mountain steppe is a habitat which is potentially suitable for establishing a healthy Takhi population. Takhi is the first species to return to its native habitat after living only in zoos for so many generations. |
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762 |
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Barton, R.A.; Byrne, R.W.; Whiten, A. |
| Title |
Ecology, feeding competition and social structure in baboons |
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Journal Article |
| Year |
1996 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
38 |
Issue |
5 |
Pages |
321-329 |
| Keywords |
Key words Ecology – Competition – Group size – Baboons |
| Abstract |
Predictions of the model of van Schaik (1989) of female-bonding in primates are tested by systematically comparing the ecology, level of within-group contest competition for food (WGC), and patterns of social behaviour found in two contrasting baboon populations. Significant differences were found in food distribution (percentage of the diet from clumped sources), feeding supplant rates and grooming patterns. In accord with the model, the tendencies of females to affiliate and form coalitions with one another, and to be philopatric, were strongest where ecological conditions promoted WGC. Group fission in the population with strong WGC was “horizontal” with respect to female dominance rank, and associated with female-female aggression during a period of elevated feeding competition. In contrast, where WGC was low, females' grooming was focused on adult males rather than other females. Recent evidence suggests that group fission here is initiated by males, tends to result in the formation of one-male groups, and is not related to feeding competition but to male-male competition for mates. An ecological model of baboon social structure is presented which incorporates the effects of female-female competition, male-male competition, and predation pressure. The model potentially accounts for wide variability in group size, group structure and social relationships within the genus Papio. Socio-ecological convergence between common baboons and hamadryas baboons, however, may be limited in some respects by phylogenetic inertia. |
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807 |
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Wolff, A.; Hausberger, M. |
| Title |
Learning and memorisation of two different tasks in horses: the effects of age, sex and sire |
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Journal Article |
| Year |
1996 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
| Volume |
46 |
Issue |
3-4 |
Pages |
137-143 |
| Keywords |
Horse; Learning; Memory; Instrumental task; Spatial task |
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Learning and memory abilities of 1-3 year old horses were assessed using instrumental and spatial tasks. No important differences were observed in the success of learning of the instrumental task (chest opening) according to sex or age. Younger females, however, seemed to learn more quickly. The offspring of a particular stallion were slower to learn than other horses. All horses memorised this task and opened the chest in a very short time in the second session. The animals that learned the task easily were not necessarily faster in the memorisation test. In the spatial task, learning ability did not seem to be related to age but more females than males were successful. The offspring of one stallion were more successful than other horses. Only 76% of the horses succeeded in the memorisation test, independently of age or sex. No correlation was found between the tasks in the latencies of either the learning or the memorisation tests for the same horses. The instrumental and spatial tasks may involve different processes. |
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855 |
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Kraak, S.B.M. |
| Title |
`Copying mate choice': Which phenomena deserve this term? |
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Journal Article |
| Year |
1996 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
36 |
Issue |
1 |
Pages |
99-102 |
| Keywords |
Copying mate choice; Proximate/ultimate causes |
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1816 |
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Levin, L.E. |
| Title |
Passage order through different pathways in groups of schooling fish, and the diversified leadership hypothesis |
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Journal Article |
| Year |
1996 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
37 |
Issue |
1 |
Pages |
1-8 |
| Keywords |
Animal sociality; Inter-individual variability; Aggregation-dispersion; Group problem solving |
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The diversified leadership hypothesis proposes that different individuals within a school of fish act as leaders in different circumstances. This `circumstantial leadership' results from inter-individual behavioral variability and a `cohesion-dispersion' tendency modulated by `failure-success' contingencies. The hypothesis predicts that when offered different pathways to escape the restriction of their swimming space, individuals within a group of fish will show 1. (a) consistent passage orders in each pathway, but2. (b) different passage orders in different pathways. Using an avoidance paddle and three different groups of fish (Aphyocharax erithrurus) the results confirmed prediction 1. (a) while prediction2. (b) was verified only in one group. |
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Equine Behaviour @ team @ room B 3.029 |
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2069 |
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| Author |
Packer, C; Heinsohn, R. |
| Title |
Response:Lioness leadership |
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Journal Article |
| Year |
1996 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
271 |
Issue |
5253 |
Pages |
1215-1216 |
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Animals; *Behavior; Animal; Cooperative Behavior; Female; Lions/*psychology; Territoriality |
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0036-8075 |
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Equine Behaviour @ team @ Jahn1996 |
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2072 |
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Gary C. Jahn; Craig Packer,Robert Heinsohn |
| Title |
Lioness leadership |
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Journal Article |
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1996 |
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Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
271 |
Issue |
5253 |
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1216-1219 |
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Animals; *Behavior; Animal; Cooperative Behavior; Female; Lions/*psychology; Territoriality |
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0036-8075 |
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Equine Behaviour @ team @ Jahn1996 |
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2073 |
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Brunner, D.; Kacelnik, A.; Gibbon, J. |
| Title |
Memory for inter-reinforcement interval variability and patch departure decisions in the starling,Sturnus vulgaris |
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Journal Article |
| Year |
1996 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
51 |
Issue |
5 |
Pages |
1025-1045 |
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An experiment with starlings was conducted to investigate the effect of variability in inter-reinforcement intervals on foraging decisions. The experimental design simulated an environment in which food was distributed in patches. Patches contained zero to four food items which could be collected by pecking at a key. All patches ended with sudden depletion. The time elapsed since the last reinforcement was the only way to detect the depletion of the patch. Once a patch was depleted, a new patch could be reached by completion of a travel requirement of 20 flights between two perches. Key pecks within a patch and the time of the last response in a patch (giving-in time) were recorded. The level of variability in the inter-reinforcement intervals was varied between different conditions. An increase in inter-reinforcement interval variability resulted in a flattening of response rate functions and giving-in time distributions, and in more asymmetry of the response functions, but not of the giving-in time distributions. Two theoretical models of decision making are presented, which differ in the assumptions about memory constraints. In one case, all inter-reinforcement intervals are remembered but in the other, only the intervals with extreme values are remembered. Both models accommodate response rates as a function of trial time, but only the second is compatible with the observed departure decision. Our results are compatible with net rate maximization. |
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2109 |
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| Author |
Kroodsma, D. E.; Miller, E. H. (eds) |
| Title |
Ecology and evolution of acoustic communication in birds |
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Book Whole |
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1996 |
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Cornell University Press |
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Ithaca |
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Kroodsma, D. E.; Miller, E. H. |
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978-0801482212 |
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no |
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Equine Behaviour @ team @ |
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2166 |
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Heyes, C.; Galef, B.G. (eds) |
| Title |
Social learning in animals: the roots of culture |
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1996 |
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Academic Press, Inc. |
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San Diego, CA |
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Heyes, C. ; Galef, B.G. |
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978-0122739651 |
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Equine Behaviour @ team @ home |
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2174 |
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