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Author |
Feh, C .; BOLDSUKH, T.; TOURENQ, C. |
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Title |
Are family groups in equids a response to cooperative hunting by predators? The case of Mongolian Kulans (Equus hemionus luteus Matschie) |
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1994 |
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Revue d´ écologie (Terre et Vie) |
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Rev Ecol (Terre Vie) |
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49 |
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11-20 |
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1083 |
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Author |
Macfadden, B.J. |
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Title |
Fossil horses Cambridge Univ Press |
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Book Whole |
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1994 |
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Synopsis
The family Equidae have an extensive fossil record spanning the last 58 million years, and the evolution of the horse has frequently been used as a classic example of long-term evolution. In recent years, however, there have been many important discoveries of fossil horses, and these, in conjunction with such new methods as cladistics, and techniques like precise geochronology, have allowed us to achieve a much greater understanding of the evolution and biology of this important group. This book synthesizes the large body of data and research relevant to an understanding of fossil horses from several disciplines including biology, geology and palaeontology. Using horses as the central theme, the author weaves together in the text such topics as modern geochronology, palaeobiogeography, climate change, evolution and extinction, functional morphology, and population biology during the Cenozoic period. |
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Cambridge University Press |
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Cambridge |
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978-0521477086 |
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1360 |
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Author |
Rubenstein, D. I. |
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Title |
The ecology of female social behaviour in horses, zebras and asses |
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Book Chapter |
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Year |
1994 |
Publication |
Animal Societies |
Abbreviated Journal |
Animal Societies |
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13-28 |
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Kyoto University Press |
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Jarman, P.J.;, Rositter, A. |
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4-87698-014-4 |
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yes |
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1528 |
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Witter, M.S.; Swaddle, J.P. |
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Title |
Fluctuating Asymmetries, Competition and Dominance |
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1994 |
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Proceedings of the Royal Society B: Biological Sciences |
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Proc. Roy. Soc. Lond. B Biol. Sci. |
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256 |
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1347 |
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299-303 |
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Levels of fluctuating asymmetry (FA) in the primary feathers of European starlings, Sturnus vulgaris, have been shown to be sensitive to nutritional and energetic stress. Furthermore, between-individual variation in plumage FA has been found to be related to social dominance, even without social interactions during feather growth, with dominant birds exhibiting the highest levels of FA. Here we examine whether the relation between dominance and FA differs when birds are housed in social groups, under different degrees of competition for food, during moult. We reason that dominants should derive a greater benefit from their social status as competition for food increases. Our results support this proposition. The relation between dominance and FA differed significantly according to the degree of competition for food. However, in no cases did the dominants exhibit lower levels of FA than subdominants. When competition for food was low, dominants had higher levels of FA than subdominants. When competition for food was high, there was no systematic relation between dominance and FA. These results suggest that dominants may only derive a net benefit from their social status, under the circumstances of our experiment, during severe conditions of competition. |
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Equine Behaviour @ team @ |
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2203 |
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Author |
Bauer, I. E.; McMorrow, J. Yalden,; D. W. |
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Title |
The Historic Ranges of Three Equid Species in North-East Africa: A Quantitative Comparison of Environmental Tolerances |
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1994 |
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Journal of Biogeography |
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J Biogeogr |
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21 |
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2 |
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169-182 |
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The historic ranges of three equid species native to north-east Africa are analysed with respect to annual rainfall, several temperature parameters and a satellite-derived multispectral index of primary productivity. Equus africanus Fitzinger, Equus grevyi Oustalet and Equus burchelli Gray used to largely replace each other, geographically, with narrow zones of range overlap occurring between E. africanus and E. grevyi in the Awash valley, and between E. grevyi and E. burchelli in southern Ethiopia and northern Kenya. The three species are shown to succeed each other along an environmental gradient. The position of each species on this gradient and the resulting location and extent of its range are discussed. Competitive exclusion, specific adaptations and historic events are likely determinants of equid distribution. In the area of sympatry between E. grevyi and E. burchelli, mixed habitat characters as well as environmental fluctuations seem to prevent either species from excluding the other. Different social organizations of E. grevyi and E. burchelli and the resulting migratory patterns may be adaptations to the environment in their allopatric ranges; in their sympatric range they could alleviate competition. |
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Equine Behaviour @ team @ |
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2222 |
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Author |
Burger, J.; Gochfeld. |
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Title |
Vigilance in African mammals: differences among mothers, other females, and males. |
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Journal Article |
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Year |
1994 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
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Volume |
131 |
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3-4 |
Pages |
153-169 |
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Equine Behaviour @ team @ |
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2252 |
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Author |
Barber, J.A.; Crowell-Davis, S.L. |
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Title |
Maternal behavior of Belgian (Equus caballus) mares |
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Journal Article |
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Year |
1994 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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41 |
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3-4 |
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161-189 |
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Belgian; Draft horse; Ontogeny; Maternal aggression; Maternal behavior; Nursing behavior; Recumbency response |
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Abstract |
The relationship between ten Belgian mares and their offspring was studied from the first day of foal life to 17 weeks of age. Mares and foals spent more time at greater distances from each other as foals matured. Mares exhibited the recumbency response, being in closer proximity to their foals when foals were recumbent than when they were upright. Foals initiated the majority of nursing bouts. Frequency and duration of nursing bouts and percentage of time resting recumbently declined as foals matured. Foals also terminated the their foals, and they were most likely to do so in the first month of foal life. Maternal initiation of nursing. There was usually no discernible foal response to maternal aggression. Little difference between maternal behavior directed towards colts and fillies was found for all aspects of the study. Maternal behavior in the Belgian draft horse was similar to that reported for other equid breeds. |
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Equine Behaviour @ team @ |
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2268 |
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Crowell-Davis, S.L. |
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Title |
Daytime rest behavior of the Welsh pony (Equus caballus) mare and foal |
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Journal Article |
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Year |
1994 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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40 |
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3-4 |
Pages |
197-210 |
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Horse; Behavior; Rest; Sleep; Pony; Foal |
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Upright and recumbent rest of 15 Welsh pony foals and their mothers was studied over a 2 year period. During their first week of life, the foals spent 32% of the time in recumbent rest. Subsequently, the percentage of time spent in recumbent rest decreased, but was still greater than for the foal's mother by Week 21, when the foals spent 6.5% of their time in recumbent rest. Adults spent little time in recumbent rest. Foals rested upright only 3.5% of the time during their first week of life. Mares rested upright more than foals did to Week 13, at which time peak values for time spent in upright rest occurred for both mares (32.5%) and foals (23%). Subsequently, mares and foals spent equal, but decreasing, amounts of time resting upright. The total time spent resting by the foals decreased gradually, and was characterized by a transition from recumbent rest to upright rest. Foals were more likely to be resting, either recumbent or upright, if their mother was resting upright. During the late spring, summer, and early autumn, mares and foals were most likely to be resting upright between 09:00 and 17:00 h. |
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Equine Behaviour @ team @ |
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2269 |
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Author |
Sappington, B.F.; Goldman, L. |
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Title |
Discrimination learning and concept formation in the Arabian horse |
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1994 |
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Journal of Animal Science |
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J. Anim Sci. |
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72 |
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12 |
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3080-3087 |
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Discrimination learning and concept formation abilities were investigated in four mature Arabian horses. A series of two-choice discrimination problems were presented on stimulus panels that could open to allow access to food bowls. Selection of the correct stimulus resulted in food reinforcement, and an incorrect choice was not rewarded. The positions of the correct and incorrect stimuli were varied randomly during each test session, and the criterion for learning each problem was 85% correct for two consecutive sessions of 30 or 40 trials. Testing progressed through six discrimination problems. The first four were simple pattern discriminations, but the last two incorporated several different triangles as correct stimuli and thus involved the concept of triangularity. Two of the subjects successfully completed only simple pattern discriminations, one showed evidence of learning in the first concept problem, and one completed all six tests, including the two concept formation problems. The results demonstrate complex pattern discrimination ability in horses, and suggest that they may also have the ability to form and use concepts in problem solving. |
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Equine Behaviour @ team @ |
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3569 |
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Author |
Marinier, S.L.; Alexander, A.J. |
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Title |
The use of a maze in testing learning and memory in horses |
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Year |
1994 |
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Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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39 |
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2 |
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177-182 |
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Horses; Learning; Memory; Maze; Exercise |
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Two mazes were used to test the learning ability and memory of horses, and changes in these abilities. Testing was done on four occasions. On Occasion 1, the horses were run through Maze A until they had reached the criterion of three consecutive correct runs. A week later (Occasion 2), they were retested in Maze A to the same criterion as a measure of memory. On Occasion 3,2 months later, the horses were run through Mazes A and B until they reached the criterion. Occasion 4 took place 1 week later when they were run through Mazes A and B. An estimation of changes in ability to learn came from a comparison of results from Occasions 1 and 3. Similarly, changes in ability to remember came from a comparison of results from Occasions 2 and 4. Nine horses with a variable amount of riding training were the subjects. All horses were able to learn the maze, but the ability varied among horses. There was no obvious correlation between quality of handling of the horses and learning ability. Once the horses had learned the maze, they remembered it perfectly on subsequent occasions. There were changes in the memory and learning ability of the horses, but no clear explanation for this could be found. |
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Equine Behaviour @ team @ |
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3573 |
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