| Records |
| Author |
Manson, J.H. |
| Title |
Male aggression: a cost of female mate choice in Cayo Santiago rhesus macaques |
Type |
Journal Article |
| Year |
1994 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
48 |
Issue |
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Pages |
473-475 |
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| Notes |
10.1006/anbe.1994.1262 |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4888 |
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| Author |
McLaren, B.E.; Peterson, R.O. |
| Title |
Wolves, Moose, and Tree Rings on Isle Royale |
Type |
Journal Article |
| Year |
1994 |
Publication |
Science |
Abbreviated Journal |
Science |
| Volume |
266 |
Issue |
5190 |
Pages |
1555-1558 |
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| Abstract |
Investigation of tree growth in Isle Royale National Park in Michigan revealed the influence of herbivores and carnivores on plants in an intimately linked food chain. Plant growth rates were regulated by cycles in animal density and responded to annual changes in primary productivity only when released from herbivory by wolf predation. Isle Royale's dendrochronology complements a rich literature on food chain control in aquatic systems, which often supports a trophic cascade model. This study provides evidence of top-down control in a forested ecosystem. |
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Equine Behaviour @ team @ |
Serial |
4995 |
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| Author |
Wilson, S. D.; Clark, A. B.; Coleman, K.; Dearstyne, T. |
| Title |
Shyness and boldness in humans and other animals |
Type |
Journal Article |
| Year |
1994 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
| Volume |
9 |
Issue |
11 |
Pages |
442-446 |
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| Abstract |
The shy-bold continuum is a fundamental axis of behavioral variation in humans and at least some other species, but its taxonomic distribution and evolutionary implications are unknown. Models of optimal risk, density- or frequency-dependent selection, and phenotypic plasticity can provide a theoretical framework for understanding shyness and boldness as a product of natural selection. We sketch this framework and review the few empirical studies of shyness and boldness in natural populations. The study of shyness and boldness adds an interesting new dimension to behavioral ecology by focusing on the nature of continuous behavioral variation that exists within the familiar categories of age, sex and size. |
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| ISSN |
0169-5347 |
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no |
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Equine Behaviour @ team @ |
Serial |
5161 |
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| Author |
Ballou, J. |
| Title |
Population Biology |
Type |
Book Chapter |
| Year |
1994 |
Publication |
Przewalski’s horse: The History and Biology of an Endangered Species |
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tate University of New York Press |
Place of Publication |
Albany |
Editor |
Boyd,L.;Houpt, C.A |
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no |
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Equine Behaviour @ team @ |
Serial |
5187 |
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| Author |
Petit, O.; Thierry, B. |
| Title |
Aggressive and peaceful interventions in conflicts in Tonkean macaques |
Type |
Journal Article |
| Year |
1994 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
48 |
Issue |
6 |
Pages |
1427-1436 |
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| Abstract |
Abstract. Peaceful interventions in conflicts are an extremely rare phenomenon in most primate species. In contrast to aggressive interventions, they cannot lead to gains in terms of competition. To clarify the function and origin of this behaviour, the patterning and consequences of peaceful and aggressive interventions were studied in a semi-free ranging group of tonkean macaques, Macaca tonkeana. Intense conflicts frequently elicited both types of intervention. Interveners preferentially targeted the initiator of the conflict, who was generally the dominant of the two opponents. Males tended to intervene more than females, especially using peaceful interventions. Interventions were frequently performed on behalf of the most closely kin-related opponent; this was true particularly for aggressive interventions. In peaceful interventions, the intervener was usually dominant over both parties. Lipsmacking, clasping, mounting and social play were mainly used, and were successful in halting aggression. Peaceful interventions were frequently followed by an affinitive interaction, such as grooming, between intervener and target. Peaceful interventions thus appear to protect the beneficiary while preserving the social relationship between intervener and target. The origin of the behaviour can be traced to the epigenetic constraints arising from the species-specific social organization. |
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0003-3472 |
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no |
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Equine Behaviour @ team @ |
Serial |
5244 |
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| Author |
Houpt, K. A.; Boyd L. |
| Title |
Social Behaviour |
Type |
Book Chapter |
| Year |
1994 |
Publication |
Przewalski's horse |
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| Publisher |
State university of New York Press |
Place of Publication |
Albany |
Editor |
Boyd L.; Houpt, K. A. |
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no |
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Equine Behaviour @ team @ |
Serial |
5433 |
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| Author |
Irvine, C.H.G.; Alexander, S.L. |
| Title |
Factors affecting the circadian rhythm in plasma cortisol concentrations in the horse |
Type |
Journal Article |
| Year |
1994 |
Publication |
Domestic Animal Endocrinology |
Abbreviated Journal |
Domest. Anim. Endocrinol. |
| Volume |
11 |
Issue |
2 |
Pages |
227-238 |
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| Abstract |
In horses, a circadian rhythm in plasma cortisol concentrations has been reported in some but not all studies. When a rhythm occurred, horses were accustomed to a management routine, comprising stabling, feeding and sometimes exercise, which may entrain a circadian pattern. In this work, we monitored plasma cortisol by collecting jugular blood through indwelling cannulae from four groups: 1): 10 untrained, unperturbed mares grazing excess pasture, bled hourly for 26 hr; 2) 4 mares housed in a barn for 48 hr before sampling every 15 min for 20–24 hr; 3) 5 mares placed in an outdoor yard for sampling every 30 min from 0930–2100 hr; and 4) 4 stabled racehorses in training, bled every 30 min from 0730–2000 hr and once the following morning at 0830 hr. Plasma cortisol showed a similarly-timed circadian rhythm (P<0.0001) in all Group 1 horses, with a peak at 0600–0900 hr, and a nadir at 1800–2100 hr. By contrast, cortisol concentrations did not vary with time in either Group 2 or 3. Neither daily mean nor peak cortisol values differed in Group 1 and 2 (i.e. bled for >= 20 hr); however nadir values were higher (P<0.05) in Group 2. In Group 4, cortisol declined (P=0.004) during the sampling period but had returned to initial concentrations the next morning. Values did not differ from those for Group 1, except between 1000 and 1300 hr when cortisol in Group 4 was lower (P<0.05). We conclude that a circadian cortisol rhythm exists in horses in the absence of any known cues imposed by humans. However, this rhythm can be obliterated by the minor perturbation of removing the horse from its accustomed environment. By contrast, the rhythm occurs in trained racehorses, suggesting either that they have adapted to their environment thereby allowing an endogenous rhythm to emerge, or that the rhythm is entrained by their daily routine. These observations highlight the difficulties in determining the cortisol status of a horse, since measurements will be affected by time of day, the occurrence of short-term fluctuations, and how accustomed the horse is to its environment. |
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0739-7240 |
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no |
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Equine Behaviour @ team @ |
Serial |
5590 |
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| Author |
Thun, R.; Schwarz-Porsche, D. |
| Title |
Nebennierenrinde |
Type |
Book Whole |
| Year |
1994 |
Publication |
Veterinärmedizinische Endokrinologie. |
Abbreviated Journal |
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Issue |
3. Aufl. |
Pages |
309-351 |
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| Publisher |
Verlag Gustav Fischer |
Place of Publication |
Jena, Stuttgart |
Editor |
F.H.Döcke |
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no |
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Equine Behaviour @ team @ |
Serial |
5998 |
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| Author |
Fisher, J.; Hinde, R. A. |
| Title |
The opening of milk bottles by birds |
Type |
Journal Article |
| Year |
1994 |
Publication |
British Birds |
Abbreviated Journal |
British Birds |
| Volume |
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Issue |
42 |
Pages |
347-357 |
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no |
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Equine Behaviour @ team @ |
Serial |
6525 |
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| Author |
Byrne R.W. |
| Title |
The evolution of intelligence |
Type |
Book Chapter |
| Year |
1994 |
Publication |
Behaviour and Evolution |
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Issue |
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Pages |
223-265 |
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Cambridge University Press |
Place of Publication |
Cambridge,UK |
Editor |
P.J.B. Slater and T.R. Halliday |
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no |
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Equine Behaviour @ team @ |
Serial |
6566 |
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