| Records |
Author  |
Dochtermann, N.A.; Jenkins, S.H. |
| Title |
Multivariate Methods and Small Sample Sizes |
Type |
Journal Article |
| Year |
2011 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
117 |
Issue |
2 |
Pages |
95-101 |
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| Publisher |
Blackwell Publishing Ltd |
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Edition |
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| ISSN |
1439-0310 |
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| Call Number |
Equine Behaviour @ team @ |
Serial |
5288 |
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| Author |
Dellert, B.; Ganslosser, U. |
| Title |
Experimental alterations of food distribution in two species of captive equids (Equus burchelli and E. hemionus kulan) |
Type |
Journal Article |
| Year |
1997 |
Publication |
Ethology Ecology & Evolution (EEE) |
Abbreviated Journal |
Ethol Ecol Evol |
| Volume |
9 |
Issue |
1 |
Pages |
1-17 |
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| Abstract |
n one group each of Plains zebra (six mares, one foal, one subadult) and Asiatic wild asses (seven mares, two foals) at Nuremberg Zoo, food distribution was experimentally changed from clumped (all food in one standard hay rack) to dispersed (one heap per animal). Both groups were characterized by different social structures, which basically remained during the experiment. Plains zebras had an individually structured system of social relationships in a dominance order, wild asses a more egalitarian system without clear-cut rank differences and low frequencies of agonistic interactions. Access to food accordingly was individually (but consistently) different for zebra mares, almost equal for wild ass mares. During the dispersed feeding situation frequencies of agonistic interactions in both species decreased (however non-significantly), individual distances increased but mares also frequently ''visited'' each others' heaps. Feeding time increased for all wild ass mares. Some individuals (in both groups) behaved ''against the trend'' in agonistic behaviour. The results are discussed with regard to food distribution for ungulates in general, and equid social systems. |
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no |
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Equine Behaviour @ team @ |
Serial |
2292 |
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| Author |
de Waal, F.B.M.; Luttrell, L.M. |
| Title |
Mechanisms of social reciprocity in three primate species: Symmetrical relationship characteristics or cognition? |
Type |
Journal Article |
| Year |
1988 |
Publication |
Ethology and Sociobiology |
Abbreviated Journal |
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| Volume |
9 |
Issue |
2–4 |
Pages |
101-118 |
| Keywords |
Reciprocity; Agonistic intervention; Cognition; Chimpanzees; Macaques |
| Abstract |
Agonistic intervention behavior was observed in captive groups of chimpanzees (Pan troglodytes), rhesus monkeys (Macaca mulatta), and stumptail monkeys (M. arctoides). Reciprocity correlations of interventions were determined while removing from the data the effects of several symmetrical relationship characteristics, that is, matrillineal kinship, proximity relations, and same-sex combination. It was considered likely that if significant reciprocity persisted after controlling for these characteristics, the reciprocity was based on cognitive mechanisms. Statistical significance was tested by means of recently developed matrix permutation procedures. All three species exhibited significant reciprocity with regard to beneficial interventions, even after controlling for symmetrical traits. Harmful interventions were, however, reciprocal among chimpanzees only. This species showed a “revenge system”, that is, if A often intervened against B, B did the same to A. In contrast, both macaque species showed significantly inversed reciprocity in their harmful interventions: if A often intervened against B, B rarely intervened against A. Further analysis indicates that the strict hierarchy of macaques prevents them from achieving complete reciprocity. Compared to chimpanzees, macaques rarely intervene against higher ranking group members. The observed contrast can be partially explained on the basis of differences in available space, as indicated by a comparison of indoor and outdoor living conditions for the chimpanzee colony. Yet, even when such spatial factors are taken into account, substantial behavior differences between chimpanzees and macaques remain. |
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0162-3095 |
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no |
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Equine Behaviour @ team @ |
Serial |
5809 |
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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 |
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 |
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1439-0310 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5181 |
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| Author |
Clucas, B.; Marzluff, J.M.; Mackovjak, D.; Palmquist, I. |
| Title |
Do American Crows Pay Attention to Human Gaze and Facial Expressions? |
Type |
Journal Article |
| Year |
2013 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
119 |
Issue |
4 |
Pages |
296-302 |
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| Abstract |
Interactions between species can lead to the evolution of interspecific communication. Non-verbal communication by humans, both intentional and unintentional, can be interpreted by other species. We tested whether American crows (Corvus brachyrhynchos) were sensitive to human facial features under field conditions by comparing flight initiation distances and urgency of escape behavior to human approaches varying in eye contact and facial expression. We first examined whether crows distinguish between an approaching human who is directly gazing at them and a human approaching them with an averted gaze. In a second experiment, we tested whether crows differentiate a smiling from scowling human approaching them with direct or averted gaze. In the first experiment, we found that crows fled sooner and more urgently when humans were directly gazing at them. Similarly, in the second experiment, crows responded sooner to a direct vs. averted gaze; however, they did not react differently to varying human facial expressions. We suggest that crows use human gaze as a reliable visual cue compared with facial expressions when making decisions about responding to approaching humans. This is the first study to show that a wild corvid species changes its behavior based on human gaze, possibly representing an adaptation to living in human-dominated urban areas and suggesting crows might perceive human intention by this visual cue. |
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1439-0310 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5670 |
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| Author |
Ceacero, F.; Landete-Castillejos, T.; Garcia, A.J.; Estevez, J.A.; Gallego, L. |
| Title |
Kinship Discrimination and Effects on Social Rank and Aggressiveness Levels in Iberian Red Deer Hinds |
Type |
Journal Article |
| Year |
2007 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
113 |
Issue |
12 |
Pages |
1133-1140 |
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| Abstract |
Abstract Kin recognition is a widespread phenomenon that allows individuals to benefit by enhancing their inclusive fitness, and one of its most common forms is reducing aggressiveness towards relatives. We carried out an experiment with Iberian red deer hinds (Cervus elaphus hispanicus) in order to examine kin biases in dominance behaviour and its consequences on social rank. Three enclosed groups (n = 36, 23 and 21, respectively) were monitored during two lactation seasons and social rank hierarchies were assessed by analysing aggressive interactions matrices with Matman 1.1 software. Aggressive interactions between related hinds was significantly smaller than expected (chi2 = 5.02, df = 1, p = 0.025), not only between mother and daughter but also in second and third kinship degrees. Although rates of aggressiveness were similar to data published relating free-ranging C. e. scoticus, aggressive interactions with relatives were significantly smaller (chi2 = 39.0, df = 1, p < 0.001). This reduction of aggressiveness between related hinds was not the result of these hinds having a lower social rank: social rank was only related to age and weight, but not to kinship degree, calf sex or calving date. The decrease of aggressiveness towards first-, second- and third-degree relatives shows a complex kin recognition system in deer. Possible nepotistic roles in lactation include preventing milk thefts by non-kin and disturbing feeding of unrelated hinds. |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4311 |
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| Author |
Carson, K.; Wood-Gush, D.G.M. |
| Title |
Equine behaviour: II. A review of the literature on feeding, eliminative and resting behaviour |
Type |
Journal Article |
| Year |
1983 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
| Volume |
10 |
Issue |
3 |
Pages |
179-190 |
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| Abstract |
The literature on the feeding, eliminative and resting behaviour of horses has been reviewed to collate the information available on these subjects. The grazing and eliminative behaviour patterns of domestic horses are unlike those of free-ranging Equidae. The reasons for this are not known, but it can cause wasted grazing of up to 90% of a field. Certain conditions, such as provision of supplementary hay and lack of available herbage, can cause these behaviour patterns to change, although it is not known how to manipulate the grazing behaviour of horses to prevent deterioration of the pasture. Grazing behaviour is influenced by many variables and is more complex than the feeding behaviour of a stabled horse. Horses sleep for approximately 12% of the day and show 4 different sleep/wakefulness states -- alert wakefulness, drowsiness, slow-wave sleep and paradoxical sleep. Horses are able to maintain slow-wave sleep while standing, but they need to lie down for paradoxical sleep to occur, rarely spending more than 30 consecutive minutes in lateral recumbency. |
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no |
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refbase @ user @ |
Serial |
1990 |
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| Author |
Carson, K.; Wood-Gush, D.G.M. |
| Title |
Equine behaviour: I. A review of the literature on social and dam--Foal behaviour |
Type |
Journal Article |
| Year |
1983 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
| Volume |
10 |
Issue |
3 |
Pages |
165-178 |
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| Abstract |
In most cases, the social organisation of each of the seven species of Equidae existing today outside captivity is either territorial or non-territorial. The striking differences found between these two types of organisation in the social grouping and bonds, mating behaviour, leadership and dominance hierarchies of the animals are examined. It is thought that the non-territorial species show a less primitive type of organisation than the territorial animals. Infant Equidae are precocious animals and are able to follow their dams soon after birth. They stay close by their dams and travel with the herd from an early age and are therefore classified as “followers”, in contrast to the species which have a period of hiding after birth. Dams recognise their foals immediately after birth, whereas it takes 2 or 3 days for a foal to form an attachment to its dam. Being in close proximity to their dams, foals are able to nurse frequently and, unless artificially weaned, a foal will nurse until its dam foals again. Foals start to graze during their first week and as they grow older they spend more time grazing and less time nursing and resting. It is normal for foals to be corprophagic until one month old, and this provides them with bacteria essential for the digestion of fibre. Play behaviour is solitary in very young foals, but after 4 weeks of age, foals play together, with male foals playing more than females and showing more aggressive, fighting movements in play. |
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no |
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Equine Behaviour @ team @ |
Serial |
2253 |
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| Author |
Carson, K.; Wood-Gush, D.G.M. |
| Title |
Equine behaviour: I. A review of the literature on social and dam--Foal behaviour |
Type |
Journal Article |
| Year |
1983 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
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| Volume |
10 |
Issue |
3 |
Pages |
165-178 |
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| Abstract |
In most cases, the social organisation of each of the seven species of Equidae existing today outside captivity is either territorial or non-territorial. The striking differences found between these two types of organisation in the social grouping and bonds, mating behaviour, leadership and dominance hierarchies of the animals are examined. It is thought that the non-territorial species show a less primitive type of organisation than the territorial animals. Infant Equidae are precocious animals and are able to follow their dams soon after birth. They stay close by their dams and travel with the herd from an early age and are therefore classified as “followers”, in contrast to the species which have a period of hiding after birth. Dams recognise their foals immediately after birth, whereas it takes 2 or 3 days for a foal to form an attachment to its dam. Being in close proximity to their dams, foals are able to nurse frequently and, unless artificially weaned, a foal will nurse until its dam foals again. Foals start to graze during their first week and as they grow older they spend more time grazing and less time nursing and resting. It is normal for foals to be corprophagic until one month old, and this provides them with bacteria essential for the digestion of fibre. Play behaviour is solitary in very young foals, but after 4 weeks of age, foals play together, with male foals playing more than females and showing more aggressive, fighting movements in play. |
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0304-3762 |
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no |
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Equine Behaviour @ team @ |
Serial |
6671 |
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| Author |
Campitelli, S.; Carenzi, C.; Verga, M. |
| Title |
Factors which influence parturition in the mare and development of the foal |
Type |
Journal Article |
| Year |
1982 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
| Volume |
9 |
Issue |
1 |
Pages |
7-14 |
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| Abstract |
Observations are reported of 127 foals born to 127 mares. In particular, comparisons are made between the mare's tendency to foal at night, the length of gestation, the weight of the foal and the weight of the foetal membrane, the time taken by the foal to attain a standing position and the time taken by the mare to expel the foetal membrane and the age of the mare and the season.
The new facts that emerge from the results are: (a) foals from middle-aged (6–11 years) mares are heavier; (b) variations of gestation length are related to the month of conception (just a trend, not a statistically significant result); (c) time for the foal to stand is related to the foal sex (females: 56.3 minutes; males 70.6 minutes, on average), and to the time taken by the mare to expel the foetal membrane; (d) parturitions take place mainly (80%) during the hours of darkness. In spring, the percentage of night births (85%) is higher than in winter (78%). |
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| Notes |
from Professor Hans Klingels Equine Reference List |
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984 |
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