| Records |
| Author |
Leblanc, M.-A.; Duncan, P. |
| Title |
Can studies of cognitive abilities and of life in the wild really help us to understand equine learning? |
Type |
Journal Article |
| Year |
2007 |
Publication |
Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
| Volume |
76 |
Issue |
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Pages |
49-52 |
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refbase @ user @ |
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621 |
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| Author |
Duncan, P.; Vigne, N. |
| Title |
The effect of group size in horses on the rate of attacks by blood-sucking flies |
Type |
Journal Article |
| Year |
1979 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
27 |
Issue |
Part 2 |
Pages |
623-625 |
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refbase @ user @ |
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763 |
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| Author |
Duncan, P. |
| Title |
Determinants of the use of habitat by horses in a mediterranean wetland |
Type |
Journal Article |
| Year |
1983 |
Publication |
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Abbreviated Journal |
J. Anim. Ecol. |
| Volume |
52 |
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93-109 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1031 |
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| Author |
Boy, V.; Duncan, P. |
| Title |
Time-budgets of Camargue horses. I. Developmental changes in the time-budgets of foals. |
Type |
Journal Article |
| Year |
1979 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
| Volume |
71 |
Issue |
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Pages |
187-201 |
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no |
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1803 |
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| Author |
Duncan, P. |
| Title |
Time-budgets of Camargue horses III. Environmental influences |
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Journal Article |
| Year |
1985 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
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92 |
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188-208 |
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| Call Number |
Equine Behaviour @ team @ |
Serial |
2283 |
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| Author |
Grange, S.; Duncan, P. |
| Title |
Bottom-up and top-down processes in African ungulate communities: resources and predation acting on the relative abundance of zebra and grazing bovids |
Type |
Journal Article |
| Year |
2006 |
Publication |
Ecography |
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| Volume |
29 |
Issue |
6 |
Pages |
899-907 |
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| Abstract |
African ungulate populations appear to be limited principally by their food resources. Within ungulate communities, plains zebras coexist with grazing bovids of similar body size, but rarely are the dominant species. Given the highly effective nutritional strategy of the equids and the resistance of zebras to drought, this is unexpected and suggests that zebra populations may commonly be limited by other mechanisms. Long-term research in the Serengeti ecosystem and in the Kruger National Park suggests that zebra could be less sensitive to food shortage, and more sensitive to predation, than grazing bovids: if this is a general principle, then, at a larger scale, resource availability should have a weaker effect on the abundance of zebra than on grazing ruminants of similar body size (wildebeest and buffalo), and zebras should be relatively more abundant in ecosystems where predators are rare or absent. We test these expectations using data on 23 near-natural ecosystems in east and southern Africa. The abundance of wildebeest is more closely related to resources than is that of zebra; buffalo are intermediate. We show that hyena densities are closely correlated with those of lions, and use the abundance of lions as an index of predation by large predators. The numerical response of lions to increases in the abundance of their prey was linear for mesoherbivores, and apparently so for the three species alone. Finally, the abundance of zebra relative to grazing bovids is lower in ecosystems with high biomasses of lions. These results indicate that zebras may commonly be more sensitive to top-down processes than grazing bovids: the mechanism(s) have not been demonstrated, but predation could play a role. If it is true, then when numbers of the large mammalian predators decline, zebra populations should increase faster than buffalo and wildebeest. |
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Equine Behaviour @ team @ Grange2006 |
Serial |
2313 |
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| Author |
Mayes, E.; Duncan, P. |
| Title |
Temporal patterns of feeding behaviour in free-ranging horses |
Type |
Journal Article |
| Year |
1986 |
Publication |
Behavior |
Abbreviated Journal |
Behav. |
| Volume |
96 |
Issue |
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Pages |
105-129 |
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no |
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Equine Behaviour @ team @ |
Serial |
2351 |
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| Author |
Monard, A.-M.; Duncan, P. |
| Title |
Consequences of natal dispersal in female horses |
Type |
Journal Article |
| Year |
1996 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
52 |
Issue |
3 |
Pages |
565-579 |
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| Abstract |
Social, genetic and reproductive consequences of natal dispersal were investigated in female horses,Equus caballus, living in a herd with a natural social structure. Dispersal did not as a rule reduce the level of competition the young mares faced: they did not selectively join groups with fewer resident females than the groups they left, and they did not attain higher ranks; there was also no tendency for females to disperse to groups with the fewest resident females, and they suffered more aggression from the mares in their new groups than in their natal groups. These results therefore do not support the hypothesis that a function of natal dispersal is to reduce intra-sexual competition. The young mares nevertheless dispersed non-randomly, generally joining harems with one stallion and at least two subadult females; and they preferred to move to groups with familiar females but no familiar males. As a result, most were closely related to some females of their new groups, but distantly related or unrelated to the male(s). Since after dispersal the young mares bred only with a male of their new groups, inbreeding coefficients of most (85%) of their offspring were lower than from matings between half siblings. These results are consistent with the hypothesis that a function of natal dispersal is to avoid close inbreeding. Dispersal did not appear to involve reproductive costs: the young mares suffered no delay in age at first reproduction, and the survival rates of their first foals tended to be higher if the females had emigrated, although not significantly so. |
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no |
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Equine Behaviour @ team @ |
Serial |
2386 |
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| Author |
Monard, A.-M.; Duncan, P.; Fritz, H.; Feh, C. |
| Title |
Variations in the birth sex ratio and neonatal mortality in a natural herd of horses |
Type |
Journal Article |
| Year |
1997 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
41 |
Issue |
4 |
Pages |
243-249 |
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| Abstract |
Variations in birth sex ratios and sex differences in juvenile mortality occur in a number of mammalian species, and in many cases have been linked to resource availability. Most of these biases in offspring sex ratios concern polygynous species with pronounced sexual dimorphism, and where females only are philopatric. Data on species with unusual life-history strategies, such as slight sexual dimorphism or dispersal by both sexes, are of particular interest. In this study of a natural herd of horses (Equus caballus) which experienced an eruptive cycle, and therefore a period of nutritional stress, male offspring had higher neonatal mortality rates in nutritionally poor years than in good ones, whereas “year quality” had no effect on the mortality of female offspring; year quality could therefore be used by mares as predictor of sex-specific offspring survival. We show that the environmental conditions that predicted lower survival of males were negatively related to their production: the birth sex ratio the following year was female-biased; and mares were less likely to produce a son when they had produced a son the preceding year. There was no significant effect of mother's parity, age or rank, or the timing of conception or birth on offspring sex ratios. The mechanism leading to biases in the birth sex ratio could have been the loss of male embryos by mares that did not foal. As there was no evidence for selective abortion of male foetuses in females that did foal the next year, it is not necessary to invoke maternal adjustment, though this remains a possibility. Finally, there was a suggestion that male offspring were more costly to raise than females, since mothers that reared a son in poor years tended to experience an increase in the interbirth interval between their two subsequent offspring. |
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no |
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Equine Behaviour @ team @ |
Serial |
2388 |
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| Author |
Duncan, P. |
| Title |
Foal killing by stallions |
Type |
Journal Article |
| Year |
1982 |
Publication |
Applied Animal Ethology |
Abbreviated Journal |
Appl. Animal. Ethol. |
| Volume |
8 |
Issue |
6 |
Pages |
567-570 |
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Feral horses live in social systems similar to those of some species in which infant killing has been reported (e.g. lions), but such behaviour has been reported neither in horses nor in any other ungulate. The results of interviews with owners of free-ranging horses (Camargue breed) are given which show that, though rare, infant killing occurs in this breed, and that it seems to be confined to male foals. It is argued that the observed behaviour cannot simply be considered as pathological, and that close attention should be paid to the possibility that it occurs in wild and feral equids. |
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0304-3762 |
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Equine Behaviour @ team @ |
Serial |
5260 |
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