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Title |
Wolves in Europe: status and perspectives |
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1993 |
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Munich Wildlife Society |
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Ettal, Germany |
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Equine Behaviour @ team @ ref8 |
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6449 |
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Author |
Neveu, P.J. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Brain Lateralization and Immunomodulation |
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Journal Article |
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Year |
1993 |
Publication |
International Journal of Neuroscience |
Abbreviated Journal |
Int J Neurosci |
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70 |
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1-2 |
Pages |
135-143 |
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Psychoneuroimmunology, brain lateralization |
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Abstract |
The two sides of the brain may be differently involved in the modulation of immune responses as demonstrated by lesional and behavioral approaches in rodents. Lesions of right or left neocortex induced opposite effects on various immune parameters including mitogen-induced lymphoproliferation, interleukin-2 production, macrophage activation or natural killer cell activity. This animal model, useful to elucidate whereby the brain and the immune system can communicate, appears to be suitable for studying the immune perturbations observed during stroke in humans. Brain asymmetry in modulation of immune reactivity may also be demonstrated in intact animal using a behavioral paradigm. The direction of a lateralized motor behavior ie paw preference in a food reaching task, correlated with an asymmetrical brain organization, was shown to be associated with lymphocyte reactivity, natural killer cell activity and auto-antibody production. The association between paw preference and immune reactivity in mice varies according to the immune parameters tested and is a sex-dependent phenomenon in which genetic background may be involved. The experimental models for investigating asymmetrical brain modulation of the immune system should be useful for studying several physiological, pathological and genetic aspects of neuroimmunomodulation. |
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Informa Clin Med |
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0020-7454 |
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doi: 10.3109/00207459309000569 |
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Equine Behaviour @ team @ |
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5778 |
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Author |
Byrne, R.W. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Do larger brains mean greater intelligence? |
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Journal Article |
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Year |
1993 |
Publication |
Behavioral and Brain Sciences |
Abbreviated Journal |
Behav. Brain Sci. |
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16 |
Issue |
4 |
Pages |
696-697 |
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Cambridge University Press |
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1469-1825 |
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Equine Behaviour @ team @ |
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6171 |
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Author |
Rutberg, A.T.; Keiper, R.R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Proximate causes of natal dispersal in feral ponies: some sex differences |
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Journal Article |
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Year |
1993 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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46 |
Issue |
5 |
Pages |
969-975 |
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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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refbase @ user @ |
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518 |
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Author |
SYLVAIN GAGNON,FRANCOISY. DORE |
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Title |
Search behavior of dogs (Canis familiaris) in invisible displacement problems |
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Journal Article |
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Year |
1993 |
Publication |
Animal Learning & Behavior |
Abbreviated Journal |
Anim Learn. & Behav. |
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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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no |
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Call Number |
refbase @ user @ |
Serial |
538 |
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Author |
Chalmeau, R.; Gallo, A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Social constraints determine what is learned in the chimpanzee |
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Journal Article |
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Year |
1993 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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28 |
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3 |
Pages |
173-179 |
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Keywords |
Operant conditioning; Social influence; Individual strategy; Chimpanzee |
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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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no |
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refbase @ user @ |
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569 |
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Author |
RÖHRS, M.; EBINGER, P. |
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Title |
Progressive und regressive Hirngrößenveränderungen bei Equiden |
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Journal Article |
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Year |
1993 |
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Abbreviated Journal |
Z zool Syst Evolut forsch |
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31 |
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233-239 |
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Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
yes |
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1513 |
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Author |
Schuhmann K, |
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Title |
Untersuchung zur Sozialstruktur des persischen Wildesels |
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Manuscript |
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1993 |
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Doctoral thesis |
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Freiburg |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1578 |
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Author |
Shah Nv, |
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Title |
Ecology of wild ass in Little Rann of Kutch |
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1993 |
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Doctoral thesis |
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Publisher ![sorted by Publisher field, descending order (down)](img/sort_desc.gif) |
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Baroda University, India. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1587 |
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Author |
Goldschmidt, T.; Bakker, T.C.M.; Feuth-de Bruijn, E. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Selective copying in mate choice of female sticklebacks |
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Journal Article |
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Year |
1993 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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45 |
Issue |
3 |
Pages |
541-547 |
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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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1818 |
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