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Author Parelli, P.
Title Type Book Whole
Year 1993 Publication Natural Horsemanship Abbreviated Journal
Volume Issue Pages
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Notes Cited By (since 1996): 5; Export Date: 21 October 2008 Approved no
Call Number Equine Behaviour @ team @ Serial 4538
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Author de Waal, F.B.M.
Title Animal Social Conflict Type Miscellaneous
Year 1993 Publication Abbreviated Journal
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Notes Approved no
Call Number Equine Behaviour @ team @ Serial 4894
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Author
Title Wolves in Europe: status and perspectives Type Book Whole
Year 1993 Publication Abbreviated Journal
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Publisher Munich Wildlife Society Place of Publication Ettal, Germany Editor
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Notes Approved no
Call Number Equine Behaviour @ team @ ref8 Serial 6449
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Author Rutberg, A.T.; Keiper, R.R.
Title Proximate causes of natal dispersal in feral ponies: some sex differences Type Journal Article
Year 1993 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.
Volume 46 Issue 5 Pages 969-975
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Abstract Abstract. Fifteen years of data on natal dispersal age and the context of dispersal for the feral ponies of Assateague Island, Maryland are presented. Ninety-seven per cent of males and 81% of females dispersed from their natal groups by 5 years of age. For animals that left their natal group, average age of dispersal was 20[middle dot]8 months for males and 24[middle dot]6 months for females. Male dispersal age was strongly and significantly correlated with number of peers in the natal group, and males dispersing with peers were significantly older than males dispersing without peers, suggesting that males delayed dispersal when peers were available for interaction. Female dispersal age was not influenced by number of peers, but was correlated with age of first reproduction. Factors not influencing dispersal age in either sex were presence of a younger sibling, maternal band transfers, and maternal age and dominance rank. The relatively high frequency of females failing to disperse from their natal groups is puzzling in light of data showing diminished fecundity in non-dispersing pony mares.
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Notes Approved no
Call Number refbase @ user @ Serial 518
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Author SYLVAIN GAGNON,FRANCOISY. DORE
Title Search behavior of dogs (Canis familiaris) in invisible displacement problems Type Journal Article
Year 1993 Publication Animal Learning & Behavior Abbreviated Journal Anim Learn. & Behav.
Volume 21 Issue 3 Pages 246-254
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Abstract Gagnon and Dor (1992) showed that domestic dogs are able to solve a Piagetian object permanence

task called the invisible displacement problem. A toy is hidden in a container which is

moved behind a screen where the toy is removed and left. Dogs make more errors in these problems

than they do in visible displacement tests, in which the object is hidden directly behind

the target screen. In Experiment 1, we examinedcomponents ofthe standard procedure of invisible

displacements that may make encoding or retention of the hiding location more difficult than

it is in visible displacements. In Experiment 2, we compared dogs performances in visible and

invisible displacement problems when delays of 0, 10, and 20 sec were introduced between the

objects final disappearance and the subjects release. The results revealed that dogs poorer performance

in invisible displacement tests is related to the complex sequence of events that have

to be encoded or remembered as well as to a difficulty in representing the position change that

is signaled, but not directly perceived.
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Notes Approved no
Call Number refbase @ user @ Serial 538
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Author Chalmeau, R.; Gallo, A.
Title Social constraints determine what is learned in the chimpanzee Type Journal Article
Year 1993 Publication Behavioural Processes Abbreviated Journal Behav. Process.
Volume 28 Issue 3 Pages 173-179
Keywords Operant conditioning; Social influence; Individual strategy; Chimpanzee
Abstract A group of six chimpanzees was placed in a social learning situation, without training. The learning task was an operant conditioning situation; that is, a subject had to pull two handles simultaneously to cause a piece of fruit to fall into the cage. Only three individuals acquired the operant behaviour. For the operant individuals, social influences on the expression of the learning task were then examined; the dominant chimpanzee during feeding had an inhibiting effect when close to the operant subjects. Depending on the subject, social factors may influence not only the specific expression of what is learnt, but also the nature of what is learnt. Chimpanzees appear to experience situations differently: they develop an individual problem-solving strategy according to their social relationships even if the experimental procedure is the same for all.
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Notes Approved no
Call Number refbase @ user @ Serial 569
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Author RÖHRS, M.; EBINGER, P.
Title Progressive und regressive Hirngrößenveränderungen bei Equiden Type Journal Article
Year 1993 Publication Abbreviated Journal Z zool Syst Evolut forsch
Volume 31 Issue Pages 233-239
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Notes from Professor Hans Klingels Equine Reference List Approved yes
Call Number Serial 1513
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Author Schuhmann K,
Title Untersuchung zur Sozialstruktur des persischen Wildesels Type Manuscript
Year 1993 Publication Abbreviated Journal
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Corporate Author Thesis Doctoral thesis
Publisher Place of Publication Freiburg Editor
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Notes from Professor Hans Klingels Equine Reference List Approved yes
Call Number Serial 1578
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Author Shah Nv,
Title Ecology of wild ass in Little Rann of Kutch Type Manuscript
Year 1993 Publication Abbreviated Journal
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Corporate Author Thesis Doctoral thesis
Publisher Place of Publication Baroda University, India. Editor
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Notes from Professor Hans Klingels Equine Reference List Approved yes
Call Number Serial 1587
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Author Goldschmidt, T.; Bakker, T.C.M.; Feuth-de Bruijn, E.
Title Selective copying in mate choice of female sticklebacks Type Journal Article
Year 1993 Publication Animal Behaviour. Abbreviated Journal Anim. Behav.
Volume 45 Issue 3 Pages 541-547
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Abstract There is evidence that female three-spined sticklebacks, Gasterosteus aculeatus L., prefer to mate with males whose nests contain eggs rather than with males with empty nests. While there is consensus on this point, a dispute exists about whether this preference should be attributed to a direct effect of the eggs on the female's entering the nest or, alternatively, to a positive impact of the eggs on the courtship behaviour and breeding coloration of the male. In the field experiment reported here females strongly preferred nests with eggs over empty nests. Additionally, females were less likely to enter risky nests with eggs: nests that contained fewer eggs than one average clutch or more eggs than the average nest content of parental males in this population. However, in the field possible differences in male attractiveness were not controlled for. In supplementary laboratory experiments the effect on female choice of possible changes in male attractiveness (intensified courtship and coloration) as a result of the presence of eggs in the nest was tested. Other differences in male attractiveness as a result of differences in male quality (body size, breeding coloration before the test, territory quality and size) were controlled for. When females had no access to the nests, they showed no preference for males with eggs in their nests in simultaneous choice tests. These results, together with the earlier published data, make it likely that the preference of females for nests with eggs is partly a direct consequence of the eggs themselves. So female sticklebacks are influenced by the mate choice behaviour of other females, but remain selective as to the actual nest content.
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Notes Approved no
Call Number Serial 1818
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