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Author |
Janik, V.M. |
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Title  |
Whistle matching in wild bottlenose dolphins (Tursiops truncatus) |
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Journal Article |
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Year |
2000 |
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Science (New York, N.Y.) |
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Science |
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289 |
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5483 |
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1355-1357 |
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Animals; Animals, Wild/physiology; Dolphins/*physiology; *Imitative Behavior; *Learning; *Social Behavior; *Vocalization, Animal |
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Dolphin communication is suspected to be complex, on the basis of their call repertoires, cognitive abilities, and ability to modify signals through vocal learning. Because of the difficulties involved in observing and recording individual cetaceans, very little is known about how they use their calls. This report shows that wild, unrestrained bottlenose dolphins use their learned whistles in matching interactions, in which an individual responds to a whistle of a conspecific by emitting the same whistle type. Vocal matching occurred over distances of up to 580 meters and is indicative of animals addressing each other individually. |
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School of Biology, University of St. Andrews, Bute Building, Fife KY16 9TS, UK |
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0036-8075 |
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PMID:10958783 |
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refbase @ user @ |
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550 |
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Regolin, L.; Tommasi, L.; Vallortigara, G. |
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Title |
Visual perception of biological motion in newly hatched chicks as revealed by an imprinting procedure |
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Journal Article |
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Year |
2000 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
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1 |
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53-60 |
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Day-old chicks were exposed to point-light animation sequences depicting either a walking hen or a rotating cylinder. On a subsequent free-choice test (experiment 1) the chicks approached the novel stimulus, irrespective of this being the hen or the cylinder. In order to obtain equivalent local motion vectors, in experiments 2 and 3 newly hatched chicks were exposed either to a point-light animation sequence depicting a walking hen, or to a positionally scrambled walking hen (i.e. an animation in which exactly the same set of dots in motion as that employed for the walking hen was presented, but with spatially randomized starting positions). Chicks tested on day 1 (experiment 2) or on day 2 (i.e. after a period in the dark following exposure on day 1 (experiment 3)) proved able to discriminate the two animation sequences: males preferentially approached the novel stimulus, females the familiar one. These results indicate that discrimination was not based on local motion vectors, but rather on the temporally integrated motion sequence. |
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Equine Behaviour @ team @ |
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3314 |
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Author |
Pichardo, M. |
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Title |
Valsequillo biostratigraphy. III: Equid ecospecies in Paleoindian sites |
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Journal Article |
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Year |
2000 |
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Anthropologischer Anzeiger; Bericht Uber die Biologisch-Anthropologische Literatur |
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Anthropol Anz |
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58 |
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3 |
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275-298 |
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Animals; *Ecology; Horses/*classification; Mexico; *Paleodontology; Species Specificity |
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Greater precision in North American Pleistocene equid taxonomy makes it now possible to exploit the ubiquitous horse remains in Paleoindian sites as ecological index-fossils. The horses of Central Mexico and the Southern Plains can be sorted by tooth size alone, except for two rare large horses of the Southern Plains. The species endemic to these grasslands and south to Central Mexico are Equus pacificus (large), E. conversidens (small), E. francisci (smallest). The Southern Plains were also occupied by a specialized grazer E. excelsus (Burnet and Sandia caves) and E. occidentalis (Dry and Sandia caves). West of the Rocky Mountains E. occidentalis was dominant. East of the Mississippi River two woodland species are found: E. fraternus and E. littoralis. |
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0003-5548 |
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PMID:11082786 |
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Equine Behaviour @ team @ |
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2648 |
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Goncalves, D.M.; Oliveira, R.F.; Korner, K.; Poschadel, J.R.; Schlupp, I. |
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Title |
Using video playbacks to study visual communication in a marine fish, Salaria pavo |
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Journal Article |
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Year |
2000 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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60 |
Issue |
3 |
Pages |
351-357 |
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Video playbacks have been successfully applied to the study of visual communication in several groups of animals. However, this technique is controversial as video monitors are designed with the human visual system in mind. Differences between the visual capabilities of humans and other animals will lead to perceptually different interpretations of video images. We simultaneously presented males and females of the peacock blenny, Salaria pavo, with a live conspecific male and an online video image of the same individual. Video images failed to elicit appropriate responses. Males were aggressive towards the live male but not towards video images of the same male. Similarly, females courted only the live male and spent more time near this stimulus. In contrast, females of the gynogenetic poecilid Poecilia formosa showed an equal preference for a live and video image of a P. mexicana male, suggesting a response to live animals as strong as to video images. We discuss differences between the species that may explain their opposite reaction to video images. |
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refbase @ user @ |
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541 |
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McKinley, J.; Sambrook, T.D. |
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Title |
Use of human-given cues by domestic dogs (Canis familiaris) and horses (Equus caballus) |
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Journal Article |
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Year |
2000 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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3 |
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1 |
Pages |
13-22 |
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Sixteen domestic dogs (Canis familiaris) and four horses (Equus caballus) were tested for their ability to use human-given manual and facial cues in an object-choice task. Two of the four horses used touch as a cue and one horse successfully used pointing. The performance of the dogs was considerably better, with 12 subjects able to use pointing as a cue, 4 able to use head orientation and 2 able to use eye gaze alone. Group analysis showed that the dogs performed significantly better in all experimental conditions than during control trials. Dogs were able to use pointing cues even when the cuer's body was closer to the incorrect object. Working gundogs with specialised training used pointing more successfully than pet dogs and gundog breeds performed better than non-gundog breeds. The results of this experiment suggest that animals' use of human given communicative signals depends on cognitive ability, the evolutionary consequences of domestication and enculturation by humans within the individual's lifetime. |
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Equine Behaviour @ team @ |
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3555 |
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Author |
Hohmann, G.; Fruth, B. |
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Title |
Use and function of genital contacts among female bonobos |
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Journal Article |
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Year |
2000 |
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Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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60 |
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1 |
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107-120 |
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Female bonobos, Pan paniscus, show a mounting behaviour that differs physically from that in other primate species. They embrace each other ventroventrally and rub their genital swellings against each other. We investigated five hypotheses on the function of ventroventral mounting (genital contacts) that derive from previous studies of both primate and nonprimate species: (1) reconciliation; (2) mate attraction; (3) tension regulation; (4) expression of social status; and (5) social bonding. We collected data in six field seasons (1993-1998) from members of a habituated, unprovisioned community of wild bonobos at Lomako, Democratic Republic of Congo. No single hypothesis could account for the use of genital contacts, which appeared to be multifunctional. We found support for hypotheses 1 and 3. Rates of postconflict genital contacts exceeded preconflict rates suggesting that the display is used in the context of reconciliation. Rates of genital contacts were high when food could be monopolized and tension was high. However, genital contacts also occurred independently of agonistic encounters. Our study shows rank-related asymmetries in initiation and performance of genital contacts supporting the social status hypothesis: low-ranking females solicited genital contacts more often than high-ranking females while the latter were more often mounter than mountee. Although subordinates took more initiative to achieve genital contact, dominants mostly responded to the solicitation (ventral presentation) with mounting, indicating that the performance benefits both individuals. We suggest that genital contacts can be used to investigate both quality and dynamics of dyadic social relationships among female bonobos. Copyright 2000 The Association for the Study of Animal Behaviour. |
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Max Planck Institute of Evolutionary Anthropology, Leipzig |
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0003-3472 |
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PMID:10924210 |
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refbase @ user @ |
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2879 |
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McComb, K.; Moss, C.; Sayialel, S.; Baker, L. |
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Unusually extensive networks of vocal recognition in African elephants |
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2000 |
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Anim Behav |
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59 |
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Equine Behaviour @ team @ McComb2000 |
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6281 |
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Gangemi, A.; Pisanelli, D.M.; Steve, G. |
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Understanding systematic conceptual structures in polysemous medical terms |
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Journal Article |
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2000 |
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Proceedings / AMIA ... Annual Symposium. AMIA Symposium |
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Proc AMIA Symp |
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285-289 |
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*Linguistics; *Terminology; Vocabulary, Controlled |
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Polysemy is a bottleneck for the demanding needs of semantic data management. We suggest the importance of a well-founded conceptual analysis for understanding some systematic structures underlying polysemy in the medical lexicon. We present some cases studies, which exploit the methods (ontological integration and general theories) and tools (description logics and ontology libraries) of the ONIONS methodology defined elsewhere by the authors. This paper addresses an aspect (systematic metomymies) of the project we are involved in, which investigates the feasibility of building a large-scale ontology library of medicine that integrates the most important medical terminology banks. |
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Istituto di Tecnologie Biomediche, CNR Roma, Italy |
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1531-605X |
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PMID:11079890 |
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refbase @ user @ |
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613 |
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Hagen, S.J.; Eaton, W.A. |
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Two-state expansion and collapse of a polypeptide |
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Journal Article |
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2000 |
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Journal of Molecular Biology |
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J Mol Biol |
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301 |
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4 |
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1019-1027 |
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Animals; Computer Simulation; Cytochrome c Group/*chemistry/*metabolism; Horses; Kinetics; Lasers; Models, Chemical; Peptides/*chemistry/*metabolism; Protein Conformation; Protein Denaturation; *Protein Folding; Spectrometry, Fluorescence; Temperature; Thermodynamics |
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The initial phase of folding for many proteins is presumed to be the collapse of the polypeptide chain from expanded to compact, but still denatured, conformations. Theory and simulations suggest that this collapse may be a two-state transition, characterized by barrier-crossing kinetics, while the collapse of homopolymers is continuous and multi-phasic. We have used a laser temperature-jump with fluorescence spectroscopy to measure the complete time-course of the collapse of denatured cytochrome c with nanosecond time resolution. We find the process to be exponential in time and thermally activated, with an apparent activation energy approximately 9 k(B)T (after correction for solvent viscosity). These results indicate that polypeptide collapse is kinetically a two-state transition. Because of the observed free energy barrier, the time scale of polypeptide collapse is dramatically slower than is predicted by Langevin models for homopolymer collapse. |
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Laboratory of Chemical Physics, NIDDK, National Institutes of Health, Building 5, Bethesda, MD, 20892-0520, USA |
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0022-2836 |
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PMID:10966803 |
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Equine Behaviour @ team @ |
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3790 |
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Hemelrijk, C.K. |
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Towards the integration of social dominance and spatial structure |
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2000 |
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Animal Behaviour. |
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Anim. Behav. |
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59 |
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5 |
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1035-1048 |
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My aim was to show how individual-oriented (or artificial life) models may provide an integrative background for the development of theories about dominance by including effects of spatial structure. Dominance interactions are thought to serve two different, contrasting functions: acquisition of high rank and reduction of aggression. The model I present consists of a homogeneous virtual world inhabited by artificial agents whose actions are restricted to grouping and dominance interactions in which the effects of winning and losing are self-reinforcing. The two functions are implemented as strategies to initiate dominance interactions and the intensity of aggression and dominance perception (direct or memory based) are varied experimentally. Behaviour is studied by recording the same behavioural units as in real animals. Ranks appear to differentiate more clearly at high than at low intensity of aggression and also more in the case of direct than of memory-based rank perception. Strong differentiation of rank produces a cascade of unexpected effects that differ depending on which function is implemented: for instance, a decline in aggression, spatial centrality of dominants and a correlation between rank and aggression. Insight into the origination of these self-organized patterns leads to new hypotheses for the study of the social behaviour of real animals. |
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refbase @ user @ |
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863 |
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