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Jedrzejewski, W.; Schmidt, K.; Theuerkauf, J.; Jedrzejewska, B.; Selva, N.; Zub, K. |
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Kill rate and predation by wolves on ungulate populations in Bialowieza primeval forest (Poland) |
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2002 |
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Ecology |
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83 |
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Equine Behaviour @ team @ Jedrzejewski2002 |
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6481 |
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Gazzola, A.; Avanzinelli, E.; Mauri, L.; Scandura, M.; Apollonio, M. |
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Temporal changes of howling in south European wolf packs |
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2002 |
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Ital J Zool |
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Equine Behaviour @ team @ Gazzola2002 |
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6495 |
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Moons, C.; Heleski, C.R.; Leece, C.M.; Zanella, A.J. |
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Title |
Conflicting Results in the Association Between Plasma and Salivary Cortisol Levels in Foals |
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Manuscript |
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2002 |
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Havemeier Workshop |
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Introduction
Glucocorticoids are present in many biological fluids as a free fraction or bound to Corticoid
Binding Globulins (CBG) (Matteri et al, 2000). There are conflicting claims regarding the validity of
saliva as a biological fluid to measure cortisol in horses (Lebelt et al, 1996; McGreevy and Pell, 1998;
van der Kolk et al, 2001). Measuring changes in salivary cortisol levels in normal horses and horses
with Cushing`s disease van der Kolk and collaborators (2001) demonstrated the validity of saliva to
assess adrenal function. Puzzling results were reported by McGreevy and Pell (1998) who suggested
that plasma and salivary cortisol concentrations in horses showing oral stereotypies were correlated
but this association was non-existent in control animals. Investigating the responses of foals to
branding and foot-trimming Zanella et al (unpublished results) were unable to identify a relationship
between plasma and salivary cortisol levels in foals. In several species, levels of cortisol in plasma and
saliva are tightly correlated (Fenske, 1996). Cortisol found in blood consists of a fraction bound to
corticoid binding globulin (CBG) and a free, unbound fraction. Free cortisol represents the
biologically active fraction of this steroid hormone. Salivary cortisol reflects the unbound fraction
found in plasma or serum and it passes readily through the parotid membrane (Riad-Fahmy, 1983;
Horning Walker et al,1977). Unbound steroids transfer rapidly between plasma and saliva
(Walker,1989; Scott et al 1990). Saliva flow-rate does not appear to influence saliva cortisol levels in
different species (Hubert and de Jong-Meyer, 1989; Walker 1989, Scott et a, 1990). In horses, Lebelt
et al (1996) reported that salivary and plasma total cortisol in stallions were correlated. We
hypothesized that changes in salivary cortisol in foals would show a pattern that is correlated to that of
plasma free and plasma total cortisol concentrations in foals. In addition, we anticipated that the lack
of good sampling techniques provides an explanation for the failure in determining the association
between salivary and plasma cortisol in foals. |
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no |
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refbase @ user @ |
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470 |
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Wakeling,E |
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Title |
Feral Horses of the West |
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2002 |
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refbase @ user @ |
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516 |
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Orbell, J.; Morikawa, T.; Allen,N. |
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Title |
The Evolution of Political Intelligence: Simulation Results |
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2002 |
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British Journal of Political Science |
Abbreviated Journal |
Br. J. Polit. Sci. |
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32 |
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613-639 |
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Several bodies of theory develop the idea that the intelligence of highly social animals – most interestingly, humans is significantly organized around the adaptive problems posed by their sociality. By this “political intelligence” hypothesis, sociality selects for, among other attributes, capacities for “manipulating” information others can gather about one's own future behaviour, and for “mindreading” such manipulations by others. Yet we have little theory about how diverse parameters of the games that social animals play select for political intelligence. We begin to address that with an evolutionary simulation in which agents choose between playing Prisoner's Dilemma and Hawk-Dove games on the basis of the information they can retrieve about each other given four broad information processing capacities. We show that political intelligence – operationally, the aggregate of those four capacities evolves to its highest levels when co-operative games are generally more attractive than conflictual ones, but when conflictual games are at least sometimes also attractive. |
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Cambridge University Press |
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English |
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no |
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refbase @ user @ |
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609 |
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Author |
Byrne, R.W. |
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Title |
Imitation of novel complex actions: What does the evidence from animals mean? |
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2002 |
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Advances in the Study of Behavior |
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Adv Stud Behav |
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31 |
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77-105 |
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Summary Underlying the various behaviors that are classified as imitation, there may be several distinct mechanisms, differing in adaptive function, cognitive basis, and computational power. Experiments reporting “true motor imitation” in animals do not as yet give evidence of production learning by imitation; instead, contextual imitation can explain their data, and this can be explained by a simple mechanism (response facilitation) which matches known neural findings. When imitation serves a function in social mimicry, which applies to a wide range of phenomena from neonatal imitation in humans and great apes to pair-bonding in some bird species, the fidelity of the behavioral match is crucial. Learning of novel behavior can potentially be achieved by matching the outcome of a model's action, and it is argued that vocal imitation by birds is a clear example of this method (which is sometimes called emulation). Alternatively, the behavior itself may be perceived in terms of actions that the observer can perform, and thus it may be copied. If the imitation is linear and stringlike (action level), following the surface form rather than the underlying plan, then its utility for learning new instrumental methods is limited. However, the underlying plan of hierarchically organized behavior is visible in output behavior, in subtle but detectable ways, and imitation could instead be based on this organization (program level), extracted automatically by string parsing. Currently, the most likely candidates for such capacities are all great apes. It is argued that this ability to perceive the underlying plan of action, in addition to allowing highly flexible imitation of novel instrumental methods, may have resulted in the competence to understand the intentions (theory of mind) of others. |
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Academic Press |
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San Diego |
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Snowdon, C. T.; Roper, T. J.;Rosenblatt,J. S. |
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refbase @ user @ |
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746 |
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McAfee L.M.; Mills D.S.; Cooper J.J. |
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The use of mirrors for the control of stereotypic weaving behaviour in the stabled horse |
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Journal Article |
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2002 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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78 |
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159-173 |
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Horse; Housing; Mirror; Stereotypy; Weaving |
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Weaving, a common locomotor stereotypy, has been associated with social isolation in stabled horses. In this study we investigated the effect of provision of mirrors on weaving as this may have a similar effect to access to conspecifics. The behaviour of six known weavers, each in one of three locations within a working equine yard, was recorded, 5 days a week for 12 weeks. After a pre-trial period of a week, one horse in each of the three locations was provided with a 1mx1.5m mirror for 5 weeks, after which time the mirrors were removed and placed in the stables of the other three subjects for the next 5 weeks. All mirrors were then removed and the horses observed for a final week (post-trial period). The provision of a mirror significantly reduced the incidence of both stereotypic weaving (P<0.001) and nodding (P<0.05) for the 5 weeks of treatment but did not affect the time the horses spent standing active, dozing or ingesting. The mirror may mimic visual contact with conspecifics (minimising the social isolation of the stable) and/or provide environmental distraction or additional visual stimuli, altering the horses' perception of the environment and their resultant responses to it. The use of mirrors in the stable appears to be a more effective treatment of weaving than many current popular treatments, including weaving bars. |
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2010 |
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King, S.R.B.; Gurnell, J. |
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Behavioural ecology of Przewalski horses (Equus przewalskii) reintroduced to Hustai National Park, Mongolia |
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2002 |
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Queen Mary, University of London |
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Ph.D. thesis |
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Equine Behaviour @ team @ |
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2320 |
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Author |
Moehlman, P. D. (ed) |
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Title |
Equids: zebras, asses and horses: status survey and conservation action plan |
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2002 |
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Once one of the most abundant grazing animals, now only seven species remain. Equids persist in some of the harshest climates and terrains in the world, habitats which are also home to many human populations. Conservation will depend on local nomadic pastoralists participating in, and benefiting from, the conservation management of their areas. Included are summaries of the conservation status, biology and ecology of wild zebras, asses, and horses and recommendations for conservation action
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Equids: Zebras, Asses And Horses: Status Survey And Conservation Action Plan
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Equids: Zebras, Asses And Horses: Status Survey And Conservation Action Plan (Paperback)
by Patricia D Moehlman (Editor)
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Editorial Reviews
Book Description
The new Equid Action Plan provides current knowledge on the biology, ecology and conservation status of wild zebras, asses, and horses. It specifies what information is lacking, and prioritizes needed conservation actions. The Action Plan also provides chapters on equid taxonomy, genetics, reproductive biology, and population dynamics. These chapters highlight unsolved issues of taxonomy and genetics. They also provide information and insight into the special demographic and genetic challenges of managing small populations. The chapter on disease provides a review of documented equine disease and epidemiology and focuses on priorities for equid conservation health. The final chapter deals with the importance of developing an assessment methodology that explicitly considers the role of equids in ecosystems and the ecological processes that are necessary for ecosystem viability. The approach of combining ecological field studies and ecosystem modeling should prove useful for the scientific management and conservation of wild equids worldwide. These chapters provide research and conservation practitioners with new information and paradigms. |
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IUCN |
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Gland, Switzerland |
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Moehlman, P. D. |
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978-2831706474 |
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Equine Behaviour @ team @ |
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2384 |
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Author |
Waring, George H. (ed) |
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Title |
Horse Behavior: The Behavioral Traits and Adaptations of Domestic and Wild Horses, Including Ponies |
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2002 |
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Noyes Publications |
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Reviews
Synopsis
The second edition of this informative book remains the most comprehensive and current overview of the behavioral traits and adaptations of horses. The book integrates findings from hundreds of international researchers to provide the reader with a factual synthesis of the behaviour of domestic and feral horses. Building on the strengths of the first edition, the author has thoroughly updated coverage of horse ancestry, development, perception, learning, play, social behavioral manipulation, maintenance activities, and sexual behaviour. Throughout these and other chapters, more emphasis has been given to animal husbandry and management. Additionally, the second edition includes an all-new section on ecological influences on activity patterns, habitat utilization, social behaviour and reproduction. An expanded section on applied ethnology provides behavioral considerations or management and insight regarding the behavioral indicators of horse health and well being. This is followed with an updated appendix listing behavioral symptoms and possible causes. The text contains numerous tables and nearly 100 illustrations and photos. Interesting Facts: Rich with international data, incorporated into text, tables, and figures Two new chapters on ecological influences dealing with interactions between environment feeding, ranging, shelter seeking, reproductive and social behavior, among other topics New chapter on behavioral considerations in horse management, plus updated material on health and well being, surveys atypical symptoms ranging from posture to social behaviour Update appendix provides an extensive listing of behavioral symptoms, with identifications of possible associated problems. |
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Noyes Publications |
Place of Publication |
Nrowich, NY |
Editor |
Waring, George H. |
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978-0815514848 |
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Equine Behaviour @ team @ |
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4233 |
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