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	Author	Dugatkin, L.A.
	Title	Winner and loser effects and the structure of dominance hierarchies			Type	Journal Article
	Year	1997	Publication	Behavioral Ecology	Abbreviated Journal	Behav. Ecol.
	Volume	8	Issue	6	Pages	583-587
	Keywords
	Abstract	In the literature on dominance hierarchies, “winner” and “loser” effects usually are denned as an increased probability of winning at time T, bated on victories at time T-l, T-2, etc, and an increased probability of losing at time T, based on losing at T-1, T-2, etc., respectively. Despite some early theoretical work on winner and loser effects, these factors and how they affect the structure of dominance hierarchies have not been examined in detail. I developed a computer simulation to examine winner and loser effects when such effects are independent of one another (as well as when they interact) and when combatants assess each other's resource-holding power. When winner effects alone were important, a hierarchy in which all individuals held an unambiguous rank was found. When only loser effects were important, a dear alpha individual always emerged, but the rank of others in the group was often unclear because of the scarcity of aggressive interactions. Increasing winner effects for a given value of the loser effect increase the number of individuals with unambiguous positions in a hierarchy and the converse is true for increasing the value of the loser effect for a given winner effect Although winner and loser effects have been documented in a number of species, no study has documented both winner and loser effects (using some controlled, pairwise testing system) and the detailed nature of behavioral interactions when individuals are in groups. I hope the results of this model will spur such studies in the future.
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	Notes	10.1093/beheco/8.6.583			Approved	no
	Call Number	refbase @ user @			Serial	759
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	Author	Kahurananga, J.; Silkiluwasha, F.
	Title	The migration of zebra and wildebeest between Tarangire National Park and Simanjiro Plains, northern Tanzania, in 1972 and recent trends			Type	Journal Article
	Year	1997	Publication	African Journal of Ecology	Abbreviated Journal	Afr J Ecol
	Volume	35	Issue	3	Pages	179-185
	Keywords
	Abstract	In 1972, four aerial censuses were carried out to assess the annual migration of zebra and wildebeest between Tarangire National Park and Simanjiro Plains. About 6000 zebra and 10,000 wildebeest were in the Plains in the middle of the rainy season, in April. During the dry season in August the animals were concentrated in the Park. The migration from the Park to the Plains started at beginning of the rains, in November/December. Recent censuses by Tanzania Wildlife Conservation Monitoring (TWCM, 1991, 1995) indicate that an estimated 23,000 zebra and 11,000 wildebeest migrate into the Park from Simanjiro and other wet season areas. Encroaching cultivation is a threat to the migration corridors and sustainability of the ecosystem . Providing benefits from wildlife to communities around the park would safeguard the future of the wildlife.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @ Kahurananga1997			Serial	2312
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	Author	Di Bitetti, M.S.
	Title	Evidence for an important social role of allogrooming in a platyrrhine primate			Type	Journal Article
	Year	1997	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	54	Issue	1	Pages	199-211
	Keywords
	Abstract	Allogrooming behaviour was analysed in a wild group of tufted capuchin monkeys,Cebus apellain Iguazu National Park, Argentina. Evidence is provided that allogrooming in this platyrrhine species serves an important social function, as has been demonstrated for catarrhine primates. Using ad libitum sampling, 654 grooming sessions were recorded during 740 contact hours with one group. Seasonal variation was found in daily time allocation to allogrooming and the mean duration and reciprocity of sessions. Individual dominance rank was an important determinant of grooming relationships. The dominant male and female were the most actively involved in grooming. Among adults, dominant individuals were involved in more sessions than were subordinate individuals. The females maintained strong grooming relationships with each other and tended to reciprocate more within sessions than did males. Oestrous females engaged in more grooming bouts with adult males than did non-oestrous females. Females with newborn infants were attractive social partners for the remaining members of the group. A social function for allogrooming inCebusis indicated by the close relationship between allogrooming, the social system and coalition formation, and by the changes in quantity and direction of grooming in response to oestrous behaviour and to the birth of infants.
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	Notes				Approved	no
	Call Number				Serial	2079
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	Author	Bateson, M.; Kacelnik, A.
	Title	Starlings' preferences for predictable and unpredictable delays to food			Type	Journal Article
	Year	1997	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	53	Issue	6	Pages	1129-1142
	Keywords
	Abstract	Risk-sensitive foraging theory is based on the premise that unpredictable runs of good or bad luck can cause a variable food source to differ in fitness value from a fixed food source yielding the same average rate of gain but no unpredictability. Thus, risk-sensitive predictions are dependent on the food intake from variable sources being not only variable but also unpredictable or `risky' in outcome. This study tested whether unpredictability is a component of the value that foraging starlings,Sturnus vulgarisattribute to food sources that are variable in the delay to obtain food. Two groups of birds chose between a fixed and a variable delay option; the variable option was unpredictable in the risky group and predictable in the risk-free group in the overall rate of intake it yielded. In both groups the fixed option was adjusted by titration to quantify the magnitude of preference for predictable and unpredictable variance. On negative energy budgets both groups were significantly risk-prone, with the risky group being significantly more risk-prone than the risk-free group. Switching the birds to positive budgets by doubling the size of each food reward had no significant effect on preference, and similar trends to those found with negative budgets were observed. These results are not readily explained by risk-sensitive foraging theory, but may be explained by the algorithm used by the birds to attribute value to average expected rewards.
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	Publisher		Place of Publication		Editor
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	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number				Serial	2108
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	Author	Castley, J.G.; Knight, M.H.
	Title	Population status of plains zebra, Equus burchelli, in South African National Parks.			Type	Journal Article
	Year	1997	Publication	Scientific Services, National Parks Board	Abbreviated Journal
	Volume		Issue		Pages
	Keywords
	Abstract
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication	Kimberley, South Africa.	Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2254
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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
	Keywords
	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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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2292
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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
	Keywords
	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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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2388
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	Author	Gallagher, M.; Rapp, P.R.
	Title	The Use Of Animal Models To Study The Effects Of Aging On Cognition			Type	Journal Article
	Year	1997	Publication	Annual Review of Psychology	Abbreviated Journal
	Volume	48	Issue	1	Pages	339-370
	Keywords
	Abstract	This review addresses the importance of animal models for understanding the effects of normal aging on the brain and cognitive functions. First, studies of laboratory animals can help to distinguish between healthy aging and pathological conditions that may contribute to cognitive decline late in life. Second, research on individual differences in aging, a theme of interest in studies of elderly human beings, can be advanced by the experimental control afforded in the use of animal models. The review offers a neuropsychological framework to compare the effects of aging in human beings, monkeys, and rodents. We consider aging in relation to the role of the medial temporal lobe in memory, the information processing functions of the prefrontal cortex in the strategic use of memory, and the regulation of attention by distributed neural circuitry. We also provide an overview of the neurobiological effects of aging that may account for alterations in psychological functions.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
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	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2971
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	Author	Bayley,L.; Maxwell, R. (eds)
	Title	Understanding Your Horse: How to Overcome Common Behaviour Problems			Type	Book Whole
	Year	1997	Publication		Abbreviated Journal
	Volume		Issue		Pages
	Keywords
	Abstract	Editorial Reviews From Booklist “Problem” horses are usually horses that are trying to tell their owners that something is wrong and reacting in the only way they know how. Lesley Bayley leads the reader through Richard Maxwell's system of understanding equine psychology and for overcoming some of the natural responses that horses use in situations that frighten or confuse them. Beginning with two chapters on how horses communicate with each other (and with their owners), the authors go on to describe the effects of pain on the horse's behavior. Two chapters on establishing trust with older, difficult horses and with “starting” (breaking in) foals and young horses lead into the final sections on dealing with specific behavioral problems. The authors stress that positive reinforcement of desired behaviors will achieve the desired results, and that understanding why a horse is acting the way it does goes a long way toward getting it to develop desirable habits or toward changing undesirable conduct. This will be an extremely useful adjunct to all of the how-to books on riding and horse care. Nancy Bent Book Description A wealth of sound advice on how to “listen to” and really understand your horse, with a caring approach to techniques for training and overcoming behavioral problems.
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	Corporate Author				Thesis
	Publisher	Trafalgar Square Publishing	Place of Publication		Editor	Bayley,L.; Maxwell, R.
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN	978-1570760730	Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	3593
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	Author	Rundgren, M.; Nordin, A.
	Title	Personality profile and simple learning tests for horses			Type	Journal Article
	Year	1997	Publication	Proceedings of the 48th Annual Meeting of the European Association of Animal Production	Abbreviated Journal
	Volume		Issue		Pages	1-4
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	Abstract
	Address
	Corporate Author				Thesis
	Publisher		Place of Publication	Vienna	Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	3598
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