| Records |
| Author |
R Development Core Team |
| Title |
R: A Language and Environment for Statistical Computing |
Type |
Software |
| Year |
2010 |
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Foundation for Statistical Computing |
Place of Publication |
Vienna |
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no |
| Call Number |
refbase @ user @ |
Serial |
822 |
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| Author |
McGreevy, P.D.; Harman, A.; McLean, A.; Hawson, L. |
| Title |
Over-flexing the horse's neck: A modern equestrian obsession? |
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Veterinary Behavior: Clinical Applications and Research |
Abbreviated Journal |
Journal of Veterinary Behavior: Clinical Applications and Research |
| Volume |
5 |
Issue |
4 |
Pages |
180-186 |
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| Abstract |
We used an opportunistic review of photographs of different adult and juvenile horses walking, trotting, and cantering (n = 828) to compare the angle of the nasal plane relative to vertical in feral and domestic horses at liberty (n = 450) with ridden horses advertised in a popular Australian horse magazine (n = 378). We assumed that horses in advertisements were shown at, what was perceived by the vendors to be, their best. Of the ridden horses, 68% had their nasal plane behind the vertical. The mean angle of the unridden horses at walk, trot, and canter (30.7 ± 11.5; 27.3 ± 12.0; 25.5 ± 11.0) was significantly greater than those of the ridden horses (1.4 ± 14.1; ?5.1 ± ?11.1; 3.1 ± 15.4, P < 0.001). Surprisingly, unridden domestic horses showed greater angles than feral horses or domestic horses at liberty. We compared adult and juvenile horses in all 3 gaits and found no significant difference. Taken together, these findings demonstrate that the longitudinal neck flexion of the degree desirable by popular opinion in ridden horses is not a common feature of unridden horses moving naturally. Moreover, they suggest that advertised horses in our series are generally being ridden at odds with their natural carriage and contrary to the international rules of dressage (as published by the International Equestrian Federation). These findings are discussed against the backdrop of the established doctrine, which states that carrying a rider necessitates changes in longitudinal flexion, and in the context of the current debate around hyperflexion. |
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Elsevier |
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1558-7878 |
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| Notes |
doi: 10.1016/j.jveb.2010.03.004 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
6501 |
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| Author |
Primack, R.B. |
| Title |
Essentials of conservation biology |
Type |
Book Whole |
| Year |
2010 |
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Edition |
Place of Publication |
Fifth |
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no |
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Equine Behaviour @ team @ Primack2010 |
Serial |
6444 |
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| Author |
Chaplin, S.J.; Gretgrix, L. |
| Title |
Effect of housing conditions on activity and lying behaviour of horses |
Type |
Journal Article |
| Year |
2010 |
Publication |
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Abbreviated Journal |
animal |
| Volume |
4 |
Issue |
5 |
Pages |
792-795 |
| Keywords |
lying, behaviour, activity, equine, housing |
| Abstract |
Housing conditions for horses impose various levels of confinement, which may compromise welfare. Lying behaviour and activity can be used as welfare indicators for domestic animals and rebound behaviour suggests a build-up of motivation resulting from deprivation. The objective of this study was to determine if activity and lying behaviour of horses are affected by housing conditions and to investigate the occurrence of rebound behaviour after release from confinement. Eight horses were subjected, in pairs, to each of four experimental treatments; paddock (P), fully stabled (FS), partly stabled (PS) and yard (Y). Each horse received 6 days acclimatisation prior to the 24 h recording period. Time spent in lying and activity were electronically recorded using a tilt switch and motion sensor connected to a data logger worn on the horse's left foreleg. Time spent active during the first 5 min of release from stable to paddock in the PS treatment (days 1 and 5) and at the same time of day in the P treatment was used as a measure of rebound behaviour. Effect of housing conditions on total time spent active was highly significant (FS = 123 s, PS = 158 s, Y = 377 s, P = 779 s, P < 0.001). Housing conditions did not significantly affect total time spent lying (P = 0.646). Horses were significantly more active, compared with baseline paddock behaviour, on release from stabling on both days 1 (P = 0.006) and 5 (P = 0.025) of PS treatment. These results suggest that activity patterns of horses, but not lying behaviour, are affected by the housing conditions tested and that rebound activity occurs in horses after a period of confinement. |
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Cambridge University Press |
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Edition |
2010/01/21 |
| ISSN |
1751-7311 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
6603 |
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| Author |
Bamford, A.J.; Monadjem, A.; Hardy, I.C.W. |
| Title |
Associations of Avian Facial Flushing and Skin Colouration with Agonistic Interaction Outcomes |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
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Issue |
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Pages |
no-no |
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| Abstract |
Abstract Facial flushing, a colour change caused by variation of blood flow through highly vascularized skin, has been observed in taxonomically diverse bird species but the function of the behaviour has not been assessed. Lappet-faced vultures, Aegypius tracheliotos, have unfeathered heads that can rapidly flush from pink to dark red, and this has been hypothesized to indicate contest ability in vulture gatherings. We show that adults with flushed heads won most interactions against those with pale heads. A previously unnoticed colour variation of the throat, visible only when the head is flushed, was also related to the outcome of interactions: blue-throated adults participated in, and won, more interactions than red-throated adults. We suggest that the non-fixed groups of which lappet-faced vulture populations consist promote the evolution of signals of dominance that can be adjusted extremely rapidly. |
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| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
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1439-0310 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5180 |
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| Author |
Collier, T.C.; Blumstein, D.T.; Girod, L.; Taylor, C.E. |
| Title |
Is Alarm Calling Risky? Marmots Avoid Calling from Risky Places |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
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Issue |
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Pages |
no-no |
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Abstract Alarm calling is common in many species. A prevalent assumption is that calling puts the vocalizing individual at increased risk of predation. If calling is indeed costly, we need special explanations for its evolution and maintenance. In some, but not all species, callers vocalize away from safety and thus may be exposed to an increased risk of predation. However, for species that emit bouts with one or a few calls, it is often difficult to identify the caller and find the precise location where a call was produced. We analyzed the spatial dynamics of yellow-bellied marmot (Marmota flaviventris) alarm calling using an acoustic localization system to determine the location from where calls were emitted. Marmots almost always called from positions close to the safety of their burrows, and, if they produced more than one alarm call, tended to end their calling bouts closer to safety than they started them. These results suggest that for this species, potential increased predation risk from alarm calling is greatly mitigated and indeed calling may have limited predation costs. |
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Blackwell Publishing Ltd |
Place of Publication |
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1439-0310 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5181 |
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| Author |
Martín, J.; López, P.; Bonati, B.; Csermely, D. |
| Title |
Lateralization When Monitoring Predators in the Wild: A Left Eye Control in the Common Wall Lizard (Podarcis muralis) |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
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Issue |
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Pages |
no-no |
| Keywords |
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| Abstract |
Abstract Lateralization is the function specialization between left and right brain hemispheres. It is now ascertained in ectotherms too, where bias in eye use for different tasks, i.e., visual lateralization, is widespread. The lateral eye position on the head of ectotherm animals, in fact, allows them to observe left/right stimuli independently and allows lateralized individuals to carry out left and right perceived tasks at the same time. A recent study conducted on common wall lizards, Podarcis muralis, showed that lizards predominantly monitor a predator with the left eye while escaping. However, this work was conducted in a controlled laboratory setting owing to the difficulty of carrying out lateralization experiments under natural conditions. Nevertheless, field studies could provide important information to support what was previously found in the laboratory and demonstrate that these traits occur in nature. In this study, we conducted a field study on the antipredatory behavior of P. muralis lizards. We simulated predatory attacks on lizards in their natural environment. We found no lateralization in the measure of eye used by the lizard to monitor the predator before escaping from it, but the eye used was probably determined by the relative position of the lizard and the predator just before the attack. This first eye used did not affect escape decisions; lizards chose to escape toward the nearest refuge irrespective of whether it was located to the lizard’s left or right side. However, once they had escaped to a refuge, lizards had a left eye–mediated bias to monitor the predator when first emerging from the refuge, and this bias was likely independent of other environmental variables. Hence, these field findings support a left eye–mediated observation of the predator in P. muralis lizards, which confirms previous findings in this and other species. |
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Blackwell Publishing Ltd |
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1439-0310 |
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| Notes |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5182 |
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| Author |
Harcourt, J.L.; Biau, S.; Johnstone, R.; Manica, A. |
| Title |
Boldness and Information Use in Three-Spined Sticklebacks |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
116 |
Issue |
5 |
Pages |
440-447 |
| Keywords |
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| Abstract |
Abstract In foraging groups, individuals may utilise information from their social environment to aid decision making when choosing where to search for food. Little work has looked at the costs or benefits of behavioural differences, such as consistent individual variation in boldness, with respect to learning ability. Here, we investigate the response of three-spined stickleback (Gasterosteus aculeatus) to ‘social cues’, ‘local enhancement’ and ‘public information’ during foraging tasks. Our results confirm previous work suggesting that this species responds to social cues and local enhancement but not public information. Variation in boldness did not affect the use of different types of information. However, time taken to make a choice and reach a patch varied between fish with different levels of boldness. Contrary to expectation, shy fish were the more variable individuals, having a greater range of reaction times when responding to the tasks. This suggests that individual behavioural differences still play a role when utilising information obtained from the environment and may influence the relative benefits that could result in different contexts. |
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Blackwell Publishing Ltd |
Place of Publication |
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1439-0310 |
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Approved |
no |
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Equine Behaviour @ team @ |
Serial |
5198 |
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| Author |
McPhee, M.E.; Segal, A.; Johnston, R.E. |
| Title |
Hamsters Use Predator Odors as Indirect Cues of Predation Risk |
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
116 |
Issue |
6 |
Pages |
517-523 |
| Keywords |
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| Abstract |
Abstract Golden hamsters (Mesocricetus auratus) use olfactory cues to assess traits of conspecifics such as kinship, individual identity, and reproductive status. The environment, however, is full of a wide variety of other olfactory information such as signals emitted by some of the hamster’s primary predators. Given this, we hypothesized that hamsters use odors from predators as an indirect sign of increased predation risk in the environment. In addition, based on data that show that wild hamsters are diurnal while laboratory hamsters are nocturnal, we hypothesized that if golden hamsters did respond to the predator odors, perceived predator risk might influence daily activity patterns in hamsters. We tested male and female hamsters over 5 d with scent gland secretion from domestic ferrets (Mustela putorius furo) and compared their behavior to that observed when they were exposed to a clean arena. In response to the predator odor, subjects significantly decreased the amount of time active outside of their burrow, returned to their burrow more quickly, and spent less time near the predator odor than the clean control stimulus. These results strongly support our hypothesis that hamsters, like other species of small mammals, avoid predator odors. The results did not, however, support our second hypothesis that exposure to predator odors during the dark phase of the light cycle would elicit a switch to a more diurnal pattern of activity. More work is needed to understand how environmental cues and internal mechanisms interact to shape activity patterns. |
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Blackwell Publishing Ltd |
Place of Publication |
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1439-0310 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5212 |
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| Author |
Warner, S.M.; Koch, T.O.; Pfau, T. |
| Title |
Inertial sensors for assessment of back movement in horses during locomotion over ground |
Type |
Journal Article |
| Year |
2010 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
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| Volume |
42 |
Issue |
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Pages |
417-424 |
| Keywords |
horse; back movement; inertial sensors; kinematics; over ground locomotion |
| Abstract |
Reasons for performing study: Assessing back movement is an important part of clinical examination in the horse and objective assessment tools allow for evaluating success of treatment. Objectives: Accuracy and consistency of inertial sensor measurements for quantification of back movement and movement symmetry during over ground locomotion were assessed; sensor measurements were compared to optical motion capture (mocap) and consistency of measurements focusing on movement symmetry was measured. Methods: Six nonlame horses were trotted in hand with synchronised mocap and inertial sensor data collection (landmarks: T6, T10, T13, L1 and S3). Inertial sensor data were processed using published methods and symmetry of dorsoventral displacement was assessed based on energy ratio, a Fourier based symmetry measure. Limits of agreement were calculated and visualised to compare mocap and sensor data. Consistency of sensor measurements was assessed using Pearson correlation coefficients and linear regression to investigate the effect of speed on movement symmetry. Results: Dorsoventral and mediolateral sensor displacement was observed to lie within ± 4–5 mm (± 2 s.d., 9–28% of movement amplitude) and energy ratio to lie within ± 0.03 of mocap data. High levels of correlation were found between strides and trials (0.86–1.0) for each horse and each sensor and variability of symmetry was lowest for T13 followed by T10, T6, L1 and S3 with no significant effect of speed at T6, T10 and T13. Conclusions: Inertial sensor displacement and symmetry data showed acceptable accuracy and good levels of consistency for back movement. The small mediolateral movement amplitude means that changes of <25% in mediolateral amplitude (also unlikely to be detected by visual assessment) may go undetected. New sensor generations with improved sensor sensitivity and ease of use of equipment indicate good potential for use in a field situation. |
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Blackwell Publishing Ltd |
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Edition |
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2042-3306 |
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no |
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Equine Behaviour @ team @ |
Serial |
5926 |
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