| Records |
| Author |
Wallner, B.; Brem, G.; Muller, M.; Achmann, R. |
| Title |
Fixed nucleotide differences on the Y chromosome indicate clear divergence between Equus przewalskii and Equus caballus |
Type |
Journal Article |
| Year |
2003 |
Publication |
Animal Genetics |
Abbreviated Journal |
Anim Genet |
| Volume |
34 |
Issue  |
6 |
Pages |
453-456 |
| Keywords |
Animals; Base Sequence; DNA, Mitochondrial/genetics; Genetic Variation/*genetics; Horses/classification/*genetics; Male; Molecular Sequence Data; Phylogeny; Probability; Species Specificity; Y Chromosome/*genetics |
| Abstract |
The phylogenetic relationship between Equus przewalskii and E. caballus is often a matter of debate. Although these taxa have different chromosome numbers, they do not form monophyletic clades in a phylogenetic tree based on mtDNA sequences. Here we report sequence variation from five newly identified Y chromosome regions of the horse. Two fixed nucleotide differences on the Y chromosome clearly display Przewalski's horse and domestic horse as sister taxa. At both positions the Przewalski's horse haplotype shows the ancestral state, in common with the members of the zebra/ass lineage. We discuss the factors that may have led to the differences in mtDNA and Y-chromosomal observations. |
| Address |
Institut fur Tierzucht und Genetik, Veterinarmedizinische Universitat Wien, Veterinarplatz, Wien, Austria. wallner@i122server.vu-wien.ac.at |
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English |
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| ISSN |
0268-9146 |
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| Notes |
PMID:14687077 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5038 |
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| Author |
Oakenfull, E.A.; Ryder, O.A. |
| Title |
Mitochondrial control region and 12S rRNA variation in Przewalski's horse (Equus przewalskii) |
Type |
Journal Article |
| Year |
1998 |
Publication |
Animal Genetics |
Abbreviated Journal |
Anim Genet |
| Volume |
29 |
Issue |
6 |
Pages |
456-459 |
| Keywords |
Animals; DNA, Mitochondrial/*genetics; Female; *Genetic Variation; Horses/*genetics; Male; Pedigree; RNA, Ribosomal/*genetics |
| 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. |
| Address |
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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| Notes |
PMID:9883508 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5040 |
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| Author |
Thor, D.H.; Holloway, W.R. |
| Title |
Social memory of the male laboratory rat |
Type |
Journal Article |
| Year |
1982 |
Publication |
Journal of Comparative and Physiological Psychology |
Abbreviated Journal |
J. Comp. Physiol. Psychol. |
| Volume |
96 |
Issue |
6 |
Pages |
1000-1006 |
| Keywords |
duration of social-investigatory behavior, measure of conspecific recognition &; social memory, male rats |
| Abstract |
Used duration of social-investigatory behavior by 36 mature male Long-Evans rats as a measure of individual recognition in 5 experiments to assess social memory. In Exp I, the duration of social investigation during a 2nd exposure to the same juvenile (n[en space]=[en space]12) was directly related to the length of the interexposure interval. In Exp II, Ss were exposed to the same or different juvenile 10 min after an initial 5-min exposure to a novel juvenile; reexposure to the same juvenile elicited significantly less social investigation than an exposure to a different juvenile. Exps III and IV demonstrated that following a 5-min introductory exposure, social memory of the juvenile was relatively brief in comparison with that of mature Ss. Exp V revealed a retroactive interference effect on recently acquired memory for an individual: 12 mature Ss exposed to interpolated social experience engaged in significantly longer investigation of a juvenile than those with no interpolated social experience. The combined results suggest that (1) the rat normally engages in spontaneous learning of individual identity and (2) social memory may be a significant aspect of complex social interactions. (16 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved) |
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0021-9940 |
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no |
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Equine Behaviour @ team @ |
Serial |
5133 |
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| Author |
Berger, J. |
| Title |
Induced abortion and social factors in wild horses |
Type |
Journal Article |
| Year |
1983 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
303 |
Issue |
5912 |
Pages |
59-61 |
| Keywords |
Abortion, Induced/*veterinary; Abortion, Veterinary/*etiology; Aggression/physiology; Animals; Evolution; Female; Horses/*physiology; Humans; Pregnancy; Sexual Behavior, Animal/*physiology |
| Abstract |
Much evidence now suggests that the postnatal killing of young in primates and carnivores, and induced abortions in some rodents, are evolved traits exerting strong selective pressures on adult male and female behaviour. Among ungulates it is perplexing that either no species have developed convergent tactics or that these behaviours are not reported, especially as ungulates have social systems similar to those of members of the above groups. Only in captive horses (Equus caballus) has infant killing been reported. It has been estimated that 40,000 wild horses live in remote areas of the Great Basin Desert of North America (US Department of Interior (Bureau of Land Management), unpublished report), where they occur in harems (females and young) defended by males. Here I present evidence that, rather than killing infants directly, invading males induce abortions in females unprotected by their resident stallions and these females are then inseminated by the new males. |
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English |
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Edition |
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0028-0836 |
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| Notes |
PMID:6682487 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4365 |
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| Author |
Blaisdell, A.P.; Sawa, K.; Leising, K.J.; Waldmann, M.R. |
| Title |
Causal reasoning in rats |
Type |
Journal Article |
| Year |
2006 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
311 |
Issue |
5763 |
Pages |
1020-1022 |
| Keywords |
Animals; *Association Learning; Bayes Theorem; *Cognition; Comprehension; Forecasting; Male; Rats; Rats, Long-Evans |
| Abstract |
Empirical research with nonhuman primates appears to support the view that causal reasoning is a key cognitive faculty that divides humans from animals. The claim is that animals approximate causal learning using associative processes. The present results cast doubt on that conclusion. Rats made causal inferences in a basic task that taps into core features of causal reasoning without requiring complex physical knowledge. They derived predictions of the outcomes of interventions after passive observational learning of different kinds of causal models. These competencies cannot be explained by current associative theories but are consistent with causal Bayes net theories. |
| Address |
Department of Psychology, University of California, Los Angeles, CA 90095, USA. blaisdell@psych.ucla.edu |
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English |
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Edition |
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1095-9203 |
ISBN |
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| Notes |
PMID:16484500 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
154 |
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| Author |
Danchin, E.; Giraldeau, L.-A.; Valone, T.J.; Wagner, R.H. |
| Title |
Public information: from nosy neighbors to cultural evolution |
Type |
Journal Article |
| Year |
2004 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
305 |
Issue |
5683 |
Pages |
487-491 |
| Keywords |
Animals; *Behavior, Animal; Cues; *Cultural Evolution; *Decision Making; Environment; Evolution; Feeding Behavior; Female; Genes; Humans; Male; Reproduction; Sexual Behavior, Animal |
| Abstract |
Psychologists, economists, and advertising moguls have long known that human decision-making is strongly influenced by the behavior of others. A rapidly accumulating body of evidence suggests that the same is true in animals. Individuals can use information arising from cues inadvertently produced by the behavior of other individuals with similar requirements. Many of these cues provide public information about the quality of alternatives. The use of public information is taxonomically widespread and can enhance fitness. Public information can lead to cultural evolution, which we suggest may then affect biological evolution. |
| Address |
U.P.M.C. CNRS-UMR7625, Bat A-7e etage-Case 237, 7 quai Saint Bernard, 75252 Paris Cedex 05, France. edanchin@snv.jussieu.fr |
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English |
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1095-9203 |
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| Notes |
PMID:15273386 |
Approved |
no |
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Serial |
2131 |
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| Author |
Subiaul, F.; Cantlon, J.F.; Holloway, R.L.; Terrace, H.S. |
| Title |
Cognitive imitation in rhesus macaques |
Type |
Journal Article |
| Year |
2004 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
305 |
Issue |
5682 |
Pages |
407-410 |
| Keywords |
Animals; *Cognition; *Imitative Behavior; *Learning; Macaca mulatta/*physiology/psychology; Male |
| Abstract |
Experiments on imitation typically evaluate a student's ability to copy some feature of an expert's motor behavior. Here, we describe a type of observational learning in which a student copies a cognitive rule rather than a specific motor action. Two rhesus macaques were trained to respond, in a prescribed order, to different sets of photographs that were displayed on a touch-sensitive monitor. Because the position of the photographs varied randomly from trial to trial, sequences could not be learned by motor imitation. Both monkeys learned new sequences more rapidly after observing an expert execute those sequences than when they had to learn new sequences entirely by trial and error. |
| Address |
Department of Anthropology, Columbia University, New York, NY 10027, USA. subiaul@aol.com |
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English |
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1095-9203 |
ISBN |
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| Notes |
PMID:15256673 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
2839 |
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| Author |
Dunbar, R. |
| Title |
Evolution of the social brain |
Type |
Journal Article |
| Year |
2003 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
302 |
Issue |
5648 |
Pages |
1160-1161 |
| Keywords |
Animals; Animals, Wild; *Cognition; Endorphins/physiology; *Evolution; Female; Grooming; Hierarchy, Social; Language; Neocortex/anatomy & histology/physiology; Papio/physiology/*psychology; *Reproduction; *Social Behavior; Social Dominance; Social Support; Vocalization, Animal |
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| Address |
School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, UK. rimd@liv.ac.uk |
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English |
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1095-9203 |
ISBN |
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| Notes |
PMID:14615522 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
548 |
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| Author |
Bergman, T.J.; Beehner, J.C.; Cheney, D.L.; Seyfarth, R.M. |
| Title |
Hierarchical classification by rank and kinship in baboons |
Type |
Journal Article |
| Year |
2003 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
302 |
Issue |
5648 |
Pages |
1234-1236 |
| Keywords |
Animals; Animals, Wild; Botswana; *Cognition; Family; Female; *Hierarchy, Social; Language; *Papio/psychology; Social Dominance; Vocalization, Animal |
| Abstract |
Humans routinely classify others according to both their individual attributes, such as social status or wealth, and membership in higher order groups, such as families or castes. They also recognize that people's individual attributes may be influenced and regulated by their group affiliations. It is not known whether such rule-governed, hierarchical classifications are specific to humans or might also occur in nonlinguistic species. Here we show that baboons recognize that a dominance hierarchy can be subdivided into family groups. In playback experiments, baboons respond more strongly to call sequences mimicking dominance rank reversals between families than within families, indicating that they classify others simultaneously according to both individual rank and kinship. The selective pressures imposed by complex societies may therefore have favored cognitive skills that constitute an evolutionary precursor to some components of human cognition. |
| Address |
Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA. thore@sas.upenn.edu |
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English |
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1095-9203 |
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| Notes |
PMID:14615544 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
689 |
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| Author |
Doligez, B.; Danchin, E.; Clobert, J. |
| Title |
Public information and breeding habitat selection in a wild bird population |
Type |
Journal Article |
| Year |
2002 |
Publication |
Science (New York, N.Y.) |
Abbreviated Journal |
Science |
| Volume |
297 |
Issue |
5584 |
Pages |
1168-1170 |
| Keywords |
*Animal Migration; Animals; Animals, Wild/physiology; *Behavior, Animal; Cognition; Cues; *Environment; Female; Male; *Nesting Behavior; Probability; *Reproduction; Songbirds/*physiology; Sweden |
| Abstract |
According to the “public information” hypothesis, some animal species may monitor the current reproductive success of conspecifics to assess local habitat quality and to choose their own subsequent breeding site. To test this hypothesis experimentally, we manipulated two components of public information, the mean number of offspring raised locally (“quantity”) and their condition (“quality”), in the collared flycatcher Ficedula albicollis. Immigration rate decreased with local offspring quantity but did not depend on local offspring quality, suggesting that immigrants are deprived of information regarding local quality. Conversely, emigration rate increased both when local offspring quantity or quality decreased, suggesting that residents can use both components of public information. |
| Address |
Laboratoire d'Ecologie CNRS-UMR 7625, Universite Pierre et Marie Curie, 7 quai Saint Bernard, Batiment A 7eme etage, Case 237, F-75252 Paris Cedex 05, France. blandine.doligez@esh.unibe.ch |
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1095-9203 |
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| Notes |
PMID:12183627 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2841 |
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