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Bates, L.A.; Sayialel, K.N.; Njiraini, N.W.; Poole, J.H.; Moss, C.J.; Byrne, R.W. |
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Title |
African elephants have expectations about the locations of out-of-sight family members |
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Journal Article |
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Year |
2008 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol Lett |
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Volume |
4 |
Issue |
1 |
Pages |
34-36 |
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Keywords |
elephants, olfaction, urine, individual recognition |
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Abstract |
Monitoring the location of conspecifics may be important to social mammals. Here, we use an expectancy-violation paradigm to test the ability of African elephants (Loxodonta africana) to keep track of their social companions from olfactory cues. We presented elephants with samples of earth mixed with urine from female conspecifics that were either kin or unrelated to them, and either unexpected or highly predictable at that location. From behavioural measurements of the elephants' reactions, we show that African elephants can recognize up to 17 females and possibly up to 30 family members from cues present in the urine-earth mix, and that they keep track of the location of these individuals in relation to themselves. |
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yes |
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Equine Behaviour @ team @ |
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4332 |
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Baumgartner, T.; Heinrichs, M.; Vonlanthen, A.; Fischbacher, U.; Fehr, E. |
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Title |
Oxytocin Shapes the Neural Circuitry of Trust and Trust Adaptation in Humans |
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Year |
2008 |
Publication |
Neuron |
Abbreviated Journal |
Neuron |
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58 |
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4 |
Pages |
639-650 |
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Sysneuro; Sysbio |
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Trust and betrayal of trust are ubiquitous in human societies. Recent behavioral evidence shows that the neuropeptide oxytocin increases trust among humans, thus offering a unique chance of gaining a deeper understanding of the neural mechanisms underlying trust and the adaptation to breach of trust. We examined the neural circuitry of trusting behavior by combining the intranasal, double-blind, administration of oxytocin with fMRI. We find that subjects in the oxytocin group show no change in their trusting behavior after they learned that their trust had been breached several times while subjects receiving placebo decrease their trust. This difference in trust adaptation is associated with a specific reduction in activation in the amygdala, the midbrain regions, and the dorsal striatum in subjects receiving oxytocin, suggesting that neural systems mediating fear processing (amygdala and midbrain regions) and behavioral adaptations to feedback information (dorsal striatum) modulate oxytocin's effect on trust. These findings may help to develop deeper insights into mental disorders such as social phobia and autism, which are characterized by persistent fear or avoidance of social interactions. |
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Cell Press, |
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0896-6273 |
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Equine Behaviour @ team @ S0896-6273(08)00327-9 DOI - 10.1016/j.neuron.2008.04.009 |
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5647 |
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Begall, S.; Cervený, J.; Neef, J.; Vojtech, O.; Burda, H. |
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Title |
Magnetic alignment in grazing and resting cattle and deer |
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Journal Article |
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Year |
2008 |
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Proceedings of the National Academy of Sciences of the United States of America |
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Proc. Natl. Acad. Sci. U.S.A. |
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105 |
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36 |
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13451-13455 |
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We demonstrate by means of simple, noninvasive methods (analysis of satellite images, field observations, and measuring “deer beds” in snow) that domestic cattle (n = 8,510 in 308 pastures) across the globe, and grazing and resting red and roe deer (n = 2,974 at 241 localities), align their body axes in roughly a north–south direction. Direct observations of roe deer revealed that animals orient their heads northward when grazing or resting. Amazingly, this ubiquitous phenomenon does not seem to have been noticed by herdsmen, ranchers, or hunters. Because wind and light conditions could be excluded as a common denominator determining the body axis orientation, magnetic alignment is the most parsimonious explanation. To test the hypothesis that cattle orient their body axes along the field lines of the Earth's magnetic field, we analyzed the body orientation of cattle from localities with high magnetic declination. Here, magnetic north was a better predictor than geographic north. This study reveals the magnetic alignment in large mammals based on statistically sufficient sample sizes. Our findings open horizons for the study of magnetoreception in general and are of potential significance for applied ethology (husbandry, animal welfare). They challenge neuroscientists and biophysics to explain the proximate mechanisms. |
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10.1073/pnas.0803650105 |
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Equine Behaviour @ team @ |
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5316 |
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Behrens, T.E.J.; Hunt, L.T.; Woolrich, M.W.; Rushworth, M.F.S. |
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Title |
Associative learning of social value |
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Journal Article |
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Year |
2008 |
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Nature |
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456 |
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7219 |
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245-249 |
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Our decisions are guided by information learnt from our environment. This information may come via personal experiences of reward, but also from the behaviour of social partners1, 2. Social learning is widely held to be distinct from other forms of learning in its mechanism and neural implementation; it is often assumed to compete with simpler mechanisms, such as reward-based associative learning, to drive behaviour3. Recently, neural signals have been observed during social exchange reminiscent of signals seen in studies of associative learning4. Here we demonstrate that social information may be acquired using the same associative processes assumed to underlie reward-based learning. We find that key computational variables for learning in the social and reward domains are processed in a similar fashion, but in parallel neural processing streams. Two neighbouring divisions of the anterior cingulate cortex were central to learning about social and reward-based information, and for determining the extent to which each source of information guides behaviour. When making a decision, however, the information learnt using these parallel streams was combined within ventromedial prefrontal cortex. These findings suggest that human social valuation can be realized by means of the same associative processes previously established for learning other, simpler, features of the environment. |
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Macmillan Publishers Limited. All rights reserved |
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0028-0836 |
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10.1038/nature07538 |
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Equine Behaviour @ team @ |
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4681 |
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Author |
Benhajali, H.; Richard-Yris, M. -A.; Leroux, M.; Ezzaouia, M.; Charfi, F.; Hausberger, M. |
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Title |
A note on the time budget and social behaviour of densely housed horses: A case study in Arab breeding mares |
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Journal Article |
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Year |
2008 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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112 |
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1-2 |
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196-200 |
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Behavioural repertoire; Time budget; Mare; Social behaviour; Density |
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We observed a high-density herd (200 mares/ha) of 44 Arab breeding mares, while in a bare paddock in Tunisia. Twenty-minute animal focal samples and scan sampling were used to determine the time budget of the mares during the period from 9 a.m. to 3 p.m. and study their social behaviour. The data obtained reveal restricted behavioural repertoires with missing behaviour like rolling, allogrooming and lying down; unusual time budgets with a high frequency of locomotion that constitutes the most frequent activity (27.9 ± 19.47%) of the mares. Social interactions were restricted to agonistic interactions but despite the high stocking density, aggressions were not that frequent among mares. |
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0168-1591 |
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Equine Behaviour @ team @ |
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4774 |
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Author |
Berge, J.; Cottier, F.; Last, K.S.; Varpe, O.; Leu, E.; Soreide, J.; Eiane, K.; Falk-Petersen, S.; Willis, K.; Nygard, H.; Vogedes, D.; Griffiths, C.; Johnsen, G.; Lorentzen, D.; Brierley, A.S. |
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Diel vertical migration of Arctic zooplankton during the polar night |
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Journal Article |
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2008 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol Lett |
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High-latitude environments show extreme seasonal variation in physical and biological variables. The classic paradigm of Arctic marine ecosystems holds that most biological processes slow down or cease during the polar night. One key process that is generally assumed to cease during winter is diel vertical migration (DVM) of zooplankton. DVM constitutes the largest synchronized movement of biomass on the planet, and is of paramount importance for marine ecosystem function and carbon cycling. Here we present acoustic data that demonstrate a synchronized DVM behaviour of zooplankton that continues throughout the Arctic winter, in both open and ice-covered waters. We argue that even during the polar night, DVM is regulated by diel variations in solar and lunar illumination, which are at intensities far below the threshold of human perception. We also demonstrate that winter DVM is stronger in open waters compared with ice-covered waters. This suggests that the biologically mediated vertical flux of carbon will increase if there is a continued retreat of the Arctic winter sea ice cover. |
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University Centre in Svalbard, Pb 156, 9171 Longyearbyen, Norway The Scottish Association for Marine Science, Dunstaffnage Marine Laboratories, Oban, Argyll PA37 1QA, UK |
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English |
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1744-9561 |
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PMID:18948249 |
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Equine Behaviour @ team @ |
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4629 |
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Author |
Bertolucci, C.; Giannetto, C.; Fazio, F.; Piccione, G. |
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Seasonal variations in daily rhythms of activity in athletic horses |
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Journal Article |
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Year |
2008 |
Publication |
Animal |
Abbreviated Journal |
Animal |
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2 |
Issue |
07 |
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1055-1060 |
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Circadian rhythms reflect extensive programming of biological activity that meets and exploits the challenges and opportunities offered by the periodic nature of the environment. In the present investigation, we recorded the total activity of athletic horses kept at four different times of the year (vernal equinox, summer solstice, autumn equinox and winter solstice), to evaluate the presence of seasonal variations of daily activity rhythms. Athletic Thoroughbred horses were kept in individual boxes with paddock. Digitally integrated measure of total activity of each mare was continuously recorded by actigraphy-based data loggers. Horse total activities were not evenly distributed over the day, but they were mainly diurnal during the year. Daily activity rhythms showed clear seasonal variations, with the highest daily amount of activity during the vernal equinox and the lowest during the winter solstice. Interestingly, the amount of activity during either photophase or scotophase changed significantly throughout the year. Circadian analysis of horse activities showed that the acrophase, the estimated time at which the peak of the rhythm occurs, did not change during the year, it always occurred in the middle of the photoperiod. Analysing the time structure of long-term and continuously measured activity and feeding could be a useful method to critically evaluate athletic horse management systems in which spontaneous locomotor activity and feeding are severely limited. Circadian rhythms are present in several elements of sensory motor and psychomotor functions and these would be taken into consideration to plan the training schedules and competitions in athletic horses. |
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Equine Behaviour @ team @ |
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4823 |
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Author |
Bertram, J.E.A.; Gutmann, A. |
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Motions of the running horse and cheetah revisited: fundamental mechanics of the transverse and rotary gallop |
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Year |
2008 |
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Journal of The Royal Society Interface |
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Mammals use two distinct gallops referred to as the transverse (where landing and take-off are contralateral) and rotary (where landing and take-off are ipsilateral). These two gallops are used by a variety of mammals, but the transverse gallop is epitomized by the horse and the rotary gallop by the cheetah. In this paper, we argue that the fundamental difference between these gaits is determined by which set of limbs, fore or hind, initiates the transition of the centre of mass from a downward–forward to upward–forward trajectory that occurs between the main ballistic (non-contact) portions of the stride when the animal makes contact with the ground. The impulse-mediated directional transition is a key feature of locomotion on limbs and is one of the major sources of momentum and kinetic energy loss, and a main reason why active work must be added to maintain speed in locomotion. Our analysis shows that the equine gallop transition is initiated by a hindlimb contact and occurs in a manner in some ways analogous to the skipping of a stone on a water surface. By contrast, the cheetah gallop transition is initiated by a forelimb contact, and the mechanics appear to have much in common with the human bipedal run. Many mammals use both types of gallop, and the transition strategies that we describe form points on a continuum linked even to functionally symmetrical running gaits such as the tölt and amble. |
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10.1098/rsif.2008.0328 |
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Equine Behaviour @ team @ |
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4780 |
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Author |
Björk, N. |
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Is it possible to measure the welfare of the ridden horse? |
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2008 |
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horse, welfare, training, learning, measure, assess |
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Since the time of domestication, humans have trained horses for the purpose of serving man. Different training methods have been developed throughout the centuries; some were developed with consideration for the horse's welfare, while others disregarded welfare to a great extent. Most present day training is based upon making the horse perform a desired behaviour through dominance and subordination. Although cooperative training techniques have gained popularity, everyday training lacks the application of learning theory or neglects the horse's learning capacities and their species' specific behaviour. Thus, the horse's welfare may be jeopardised.
The aim with this review is to consider methods that allow an objective assessment of the welfare of horses undergoing training. The review gives a brief insight into the history of horse training and handling. It proceeds with an overview of the horse"s learning abilities which is argued to be of paramount importance for effective training. The review then describes a few selected training techniques that are used today, based on negative and positive reinforcement, and discusses parameters from which it could be possible to assess the welfare of the ridden horse. The work concludes with suggestion for future |
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Bachelor's thesis |
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Equine Behaviour @ team @ |
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4749 |
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Blackmore, T.L.; Foster, T.M.; Sumpter, C.E.; Temple, W. |
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An investigation of colour discrimination with horses (Equus caballus) |
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2008 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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78 |
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3 |
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387-396 |
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Chromatic discrimination; Colour vision; Horse; Operant |
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The ability of four horses (Equus caballus) to discriminate coloured (three shades of blue, green, red, and yellow) from grey (neutral density) stimuli, produced by back projected lighting filters, was investigated in a two response forced-choice procedure. Pushes of the lever in front of a coloured screen were occasionally reinforced, pushes of the lever in front of a grey screen were never reinforced. Each colour shade was randomly paired with a grey that was brighter, one that was dimmer, and one that approximately matched the colour in terms of brightness. Each horse experienced the colours in a different order, a new colour was started after 85% correct responses over five consecutive sessions or if accuracy showed no trend over sessions. All horses reached the 85% correct with blue versus grey, three horses did so with both yellow and green versus grey. All were above chance with red versus grey but none reached criterion. Further analysis showed the wavelengths of the green stimuli used overlapped with the yellow. The results are consistent with histological and behavioural studies that suggest that horses are dichromatic. They differ from some earlier data in that they indicate horses can discriminate yellow and blue, but that they may have deficiencies in discriminating red and green. |
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0376-6357 |
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Equine Behaviour @ team @ |
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5336 |
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