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Author |
Klingel, H. |
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Title |
Kalameili – future home of the Przewalski horse? |
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Book Chapter |
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Year |
1990 |
Publication |
Proceedings of the 5th International Symposium on the Preservation of the Przewalski Horse, Leipzig |
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221-224 |
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Zoolog Garten |
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Leipzig |
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Seifert, S. |
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Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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Serial |
1323 |
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Author |
Byrne, R.W.; Whiten, A.; Henzi, S.P. |
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Title |
Social relationships of mountain baboons: Leadership and affiliation in a non-female-bonded monkey |
Type |
Journal Article |
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Year |
1990 |
Publication |
American journal of primatology |
Abbreviated Journal |
Am. J. Primatol. |
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Volume |
20 |
Issue |
4 |
Pages |
313-329 |
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Keywords |
relationships; one-male groups; female-bonding; spacing; support; Papio ursinus; Papio hamadryas |
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Abstract |
Abstract 10.1002/ajp.1350200409.abs Instead of close and differentiated relationships among adult females, the accepted norm for savanna baboons, groups of Drakensberg mountain baboons (Papio ursinus) showed strong affiliation of females towards a single male. The same male was usually the decision-making animal in controlling group movements. Lactating or pregnant females focused their grooming on this “leader” male, producing a radially patterned sociogram, as in the desert baboon (P. hamadryas); the leader male supported young animals in the group against aggression and protected them against external threats. Unlike typical savanna baboons, these mountain baboons rarely displayed approach-retreat or triadic interactions, and entirely lacked coalitions among adult females. Both groups studied were reproductively one-male; male-female relationships in one were like those in a unit of a hamadryas male at his peak, while the other group resembled the unit of an old hamadryas male, who still leads the group, with a male follower starting to build up a new unit and already monopolizing mating. In their mountain environment, where the low population density suggests conditions as harsh for baboons as in deserts, adults in these groups kept unusually large distances apart during ranging; kin tended to range apart, and spacing of adults was greatest at the end of the dry, winter season. These facts support the hypothesis that sparse food is responsible for convergence with hamadryas social organization. It is suggested that all baboons, though matrilocal, are better categorized as “cross-sex-bonded” than “female bonded”. |
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Wiley Subscription Services, Inc., A Wiley Company |
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1098-2345 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5309 |
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Author |
Cheney D.L.; Seyfarth, R.M. |
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Title |
How monkeys see the world: Inside the mind of another species |
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Book Whole |
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Year |
1990 |
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University of Chicago Press |
Place of Publication |
Chicago |
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no |
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refbase @ user @ |
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706 |
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Author |
Edgar, G.K.; Smith, A.T. |
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Title |
Hemifield differences in perceived spatial frequency |
Type |
Journal Article |
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Year |
1990 |
Publication |
Perception |
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Volume |
19 |
Issue |
6 |
Pages |
759-766 |
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Abstract |
Measurements of the perceived spatial frequency of stationary sinewave gratings were made with the gratings presented at the same eccentricity in the left, right, upper, and lower visual hemifields. Ten subjects performed the task binocularly with spatial frequencies of 1, 2, and 4 cycles deg-1. Two of these subjects also performed the task monocularly at 2 cycles deg-1. In the majority of cases, the spatial frequency of stimuli presented in the left and lower visual hemifields was overestimated relative to stimuli presented in the right and upper visual hemifields. The results were similar for all spatial frequencies tested, and the direction of the asymmetry was the same whether viewing was with the left eye, right eye or binocular, suggesting that the differences in perceived spatial frequency are not retinal in origin. |
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Pion Ltd |
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Call Number |
Equine Behaviour @ team @ |
Serial |
5374 |
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Author |
Byrne, R.W.; Whiten, A. |
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Title |
Tactical deception in primates: the 1990 database |
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Book Whole |
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Year |
1990 |
Publication |
Primate Reports |
Abbreviated Journal |
Primate Rep. |
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Volume |
27 |
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1-101 |
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German Primate Center |
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no |
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Equine Behaviour @ team @ |
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6172 |
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Author |
Tomasello, M. |
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Title |
Cultural transmission in the tool use and communicatory signalling of chimpanzees? |
Type |
Book Chapter |
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Year |
1990 |
Publication |
Language and Intelligence in Monkeys and Apes. |
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Pages |
274-311 |
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Cambridge University Press |
Place of Publication |
Cambridge |
Editor |
Parker,S.T.;Gibson,K.R. |
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no |
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Equine Behaviour @ team @ |
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5267 |
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Author |
Houpt, K.A.; Zahorik, D.M.; Swartzman-Andert, J.A. |
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Title |
Taste aversion learning in horses |
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Journal Article |
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Year |
1990 |
Publication |
Journal of animal science |
Abbreviated Journal |
J. Anim Sci. |
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Volume |
68 |
Issue |
8 |
Pages |
2340-2344 |
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Keywords |
Animal Feed; Animals; *Avoidance Learning; Feeding Behavior/*psychology; *Food Preferences; Horses/physiology/*psychology; *Taste |
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Abstract |
The ability of ponies to learn to avoid a relatively novel food associated with illness was tested in three situations: when illness occurred immediately after consuming a feed; when illness occurred 30 min after consuming a feed; and when illness was contingent upon eating one of three feeds offered simultaneously. Apomorphine was used to produce illness. The feeds associated with illness were corn, alfalfa pellets, sweet feed and a complete pelleted feed. The ponies learned to avoid all the fees except the complete feed when apomorphine injection immediately followed consumption of the feed. However, the ponies did not learn to avoid a feed if apomorphine was delayed 30 min after feed consumption. They could learn to avoid alfalfa pellets, but not corn, when these feeds were presented with the familiar “safe foods,” oats and soybean meal. Ponies apparently are able to learn a taste aversion, but there were constraints on this learning ability. Under the conditions of this study, they did not learn to avoid a food that made them sick long after consumption of the food, and they had more difficulty learning to avoid highly palatable feeds. |
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Cornell University, Ithaca, NY 14853 |
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English |
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0021-8812 |
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Notes |
PMID:2401656 |
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refbase @ user @ |
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41 |
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Author |
Rutberg, A.T.; Greenberg, S.A. |
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Title |
Dominance, aggression frequencies and modes of aggressive competition in feral pony mares |
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Journal Article |
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Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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40 |
Issue |
2 |
Pages |
322-331 |
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Abstract |
Feral pony mares, Equus caballus, at Assateague Island, Maryland, formed linear dominance hierarchies within bands. Generally, older mares dominated younger mares, and larger mares dominated smaller mares. Large mares initiated aggression more often than small mares when age was controlled for but, surprisingly, older mares initiated aggression less often than younger mares when size was controlled for. Thus, mares peak in aggressiveness fairly soon after achieving full size and then, while maintaining or improving their rank in the domainance hierarchy, progressively reduce their involvement in aggression as they grow older, Involvement in aggression per mare increased as number of mares in the group increased; this effect was independent of nearest-mare distances. Frequency of involvement in aggression did not differ between mares that had changed bands within the year and mares whose band association had continued for a year or more. Aggression was directed more frequently than expected at subordinate mares who were nursing, and also occurred more frequently than expected at water holes. The proportion of aggressive encounters during grazing closely matched the total proportion of time spent grazing. Subordinate mares with foals received aggression more often than subordinate mares without foals. The high frequency of aggression associated with foals and nursing suggests that interference with reproduction of subordiantes is an important mode of competition between mares. Such interference may be common in animals that feed on dispersed resources and live in small, cohesive groups. |
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refbase @ user @ |
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755 |
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Author |
Janson, C.H. |
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Title |
Social correlates of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
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Journal Article |
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Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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40 |
Issue |
5 |
Pages |
910-921 |
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Abstract |
Individuals in a foraging group of wild bronwn capuchin monkeys choose different spatial positions relative to the rest of the group. Markov analysis of sequencess of individual spatial positions demonstrated significant differnces between individuals, which coul be categorized a posteriori into four homogenous subgroups. An individual's spatial position was related primarily to the amount of aggression it received from the group's dominant male, but also varied with its sex. Spatial choice varied with changes in an individual's social status, but did not vary consistently with seasonal differences in food availability. These results support the hypothesis that individuals compete for preferred spatial positions within a foraging group. |
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refbase @ user @ |
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773 |
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Author |
Janson, C.H. |
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Title |
Ecological consequences of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
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Journal Article |
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Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
40 |
Issue |
5 |
Pages |
922-934 |
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Abstract |
Individuals in a foraging group of brown capuchin monkeys choose different spatial positions relative to the rest of the group. An individual's choice of spatial positiion affects its foraging success and perceived predation risk (as measured by vigilance behaviour). The two most dominant group members preferred to forage where their expected forwaging success was greatest. Juveniles chose to forage where their perceived predation risk was least, not where they would achieve the highest foraging success. The positions used by non-dominant adults neither maximized foraging success nor minimized predation risk. It is likely that subordinate adults accept spatial positions with suboptimal ecological consequences to avoid the costs of frequent confrontations with the dominant members of the group over foraging sites in poreferred positions. |
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refbase @ user @ |
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774 |
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