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	Author	Dusek, J.A.; Eichenbaum, H.
	Title	The hippocampus and memory for orderly stimulus relations			Type	Journal Article
	Year	1997	Publication	Proceedings of the National Academy of Sciences of the United States of America	Abbreviated Journal	Proc. Natl. Acad. Sci. U.S.A.
	Volume	94	Issue	13	Pages	7109-7114
	Keywords	Animals; Attention; Discrimination (Psychology)/physiology; Hippocampus/anatomy & histology/physiology; Male; Memory/physiology; Rats
	Abstract	Human declarative memory involves a systematic organization of information that supports generalizations and inferences from acquired knowledge. This kind of memory depends on the hippocampal region in humans, but the extent to which animals also have declarative memory, and whether inferential expression of memory depends on the hippocampus in animals, remains a major challenge in cognitive neuroscience. To examine these issues, we used a test of transitive inference pioneered by Piaget to assess capacities for systematic organization of knowledge and logical inference in children. In our adaptation of the test, rats were trained on a set of four overlapping odor discrimination problems that could be encoded either separately or as a single representation of orderly relations among the odor stimuli. Normal rats learned the problems and demonstrated the relational memory organization through appropriate transitive inferences about items not presented together during training. By contrast, after disconnection of the hippocampus from either its cortical or subcortical pathway, rats succeeded in acquiring the separate discrimination problems but did not demonstrate transitive inference, indicating that they had failed to develop or could not inferentially express the orderly organization of the stimulus elements. These findings strongly support the view that the hippocampus mediates a general declarative memory capacity in animals, as it does in humans.
	Address	Department of Psychology, Boston University, 64 Cummington Street, Boston, MA 02215, USA
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	ISSN	0027-8424	ISBN		Medium
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	Notes	PMID:9192700			Approved	no
	Call Number	refbase @ user @			Serial	607
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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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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @ Kahurananga1997			Serial	2312
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	Author	Dulac, C.
	Title	Molecular biology of pheromone perception in mammals			Type	Journal Article
	Year	1997	Publication	Seminars in Cell & Developmental Biology	Abbreviated Journal	Semin Cell Dev Biol
	Volume	8	Issue	2	Pages	197-205
	Keywords	accessory olfactory bulb; olfaction; olfactory receptor; pheromone; vomeronasal
	Abstract	In mammals, olfactory sensory perception is mediated by two anatomically and functionally distinct sensory organs: the main olfactory epithelium (MOE) and the vomeronasal organ (VNO). Pheromones activate the VNO and elicit a characteristic array of innate reproductive and social behaviors, along with dramatic neuroendocrine responses. Recent approaches have provided new insights into the molecular biology of sensory transduction in the vomeronasal organ. Differential screening of cDNA libraries constructed from single sensory neurons from the rat VNO has led to the isolation of a family of genes which are likely to encode mammalian pheromone receptors. The isolation of these receptors from the vomeronasal organ might permit the analysis of the molecular events which translate the bindings of pheromones into innate stereotypic behaviors and help to elucidate the logic of pheromone perception in mammals.
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	797
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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	Le Scolan, N.; Hausberger, M.; Wolff, A.
	Title	Stability over situations in temperamental traits of horses as revealed by experimental and scoring approaches			Type	Journal Article
	Year	1997	Publication	Behavioural Processes	Abbreviated Journal	Behav. Process.
	Volume	41	Issue	3	Pages	257-266
	Keywords	Behavioural tests; Horse; Ratings; Temperament
	Abstract	Individual behavioural reactions of adult horses in a variety of experimental tests were compared with ratings by riding teachers. The tests were made in a non working situation, with the animals being released in an arena, a box (arena test, new object test, learning tests) or handled (new object/handling situation). The traits rated by teachers were fearfulness, nervousness, gregariousness and learning abilities at work (ridden or handled). Despite a great homogeneity in the reactions exhibited by the horses in the different situations, large individual differences were present. Correlations appeared between the reactivity in the arena test and the score of gregariousness, between the reactivity in the novel object test and the rating of nervousness when ridden, between the results in the handling test and the rating of general fearfulness and between the ability to memorise an instrumental task and the score of general learning ability. Such results strengthen the idea that there are underlying behavioural dispositions that are stable across situations and that the experimental tests may be good predictors of the temperament in untrained animals.
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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	3591
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	Author	Lafleur, D.L.; Lozano, G.A.; Sclafani, M.
	Title	Female mate-choice copying in guppies,Poecilia reticulata: a re-evaluation			Type	Journal Article
	Year	1997	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	54	Issue	3	Pages	579-586
	Keywords
	Abstract	It has been argued that intraspecific mate-choice copying can be adaptive under certain conditions. Dugatkin's (1992,Am. Nat.139, 1384-1389) work with guppies,Poecilia reticulataremains the most influential experimental demonstration of this phenomenon. We replicated Dugatkin's work using several choice criteria to ensure that our results were not dependent upon any single method of judging mate choice. We also tested our findings against two null hypotheses of differing stringency. Irrespective of the choice criteria or null hypothesis used, we did not observe any relationship between female mate choice and copying. We conclude that further experimental evidence of female mate-choice copying is required before the existence of this behaviour can be affirmed.
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	484
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	Author	Brodbeck, D.R.
	Title	Picture fragment completion: priming in the pigeon			Type	Journal Article
	Year	1997	Publication	Journal of Experimental Psychology. Animal Behavior Processes	Abbreviated Journal	J Exp Psychol Anim Behav Process
	Volume	23	Issue	4	Pages	461-468
	Keywords	Animals; Attention; Awareness; Columbidae; Mental Recall; Pattern Recognition, Visual; *Perceptual Masking; Problem Solving
	Abstract	It has been suggested that the system behind implicit memory in humans is evolutionarily old and that animals should readily show priming. In Experiment 1, a picture fragment completion test was used to test priming in pigeons. After pecking a warning stimulus, pigeons were shown 2 partially obscured pictures from different categories and were always reinforced for choosing a picture from one of the categories. On control trials, the warning stimulus was a picture of some object (not from the S+ or S- category), on study trials the warning stimulus was a picture to be categorized on the next trial, and on test trials the warning stimulus was a randomly chosen picture and the S+ picture was the warning stimulus seen on the previous trial. Categorization was better on study and test trials than on control trials. Experiment 2 ruled out the possibility that the priming effect was caused by the pigeons' responding to familiarity by using warning stimuli from both S+ and S- categories. Experiment 3 investigated the time course of the priming effect.
	Address	Department of Psychology, University of Western Ontario, London, Ontario, Canada. brodbeck@thunderbird.auc.laurentian.ca
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	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
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	Series Volume		Series Issue		Edition
	ISSN	0097-7403	ISBN		Medium
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	Notes	PMID:9411019			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2777
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	Author	Palombit,R.A.; Seyfarth, R.M.; Cheney, D.L.
	Title	The adaptive value of 'friendships' to female baboons: experimental and observational evidence			Type	Journal Article
	Year	1997	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	54	Issue	3	Pages	599-614
	Keywords
	Abstract	Lactating female baboons, Papio cynocephalusoften maintain close associations with particular males. There are at least three proposed benefits of 'friendships' to females: (1) male protection against potentially infanticidal males; (2) male protection against harassment by dominant females; (3) male attachment to an infant that develops into future care of juveniles. These hypotheses were examined in a population of chacma baboons, P. c. ursinusin which male infanticide accounted for at least 38% of infant mortality. Almost all mothers of young infants formed strong bonds with one or two males with whom they had copulated during the cycle in which they conceived their infants. Females were primarily responsible for maintaining friendships during lactation, but they terminated these relationships if their infants died. In playbacks of females' screams, male friends responded more strongly than control males. They also responded more strongly to the screams of female friends than to the screams of control females. Following an infant's death, however, male friends responded less strongly than control males to the same females' screams. Finally, male friends responded more strongly than control males to playback sequences in which female screams were combined with the threat vocalizations of a potentially infanticidal alpha male, but not when female screams were combined with the threat calls of a non-infanticidal male or the alpha female. Both observations and experiments suggest that the benefits of friendships to females derive from the protection of their infants against infanticide.1997The Association for the Study of Animal Behaviour
	Address	Department of Psychology, University of Pennsylvania
	Corporate Author				Thesis
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	Language	English	Summary Language		Original Title
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	ISSN	0003-3472	ISBN		Medium
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	Notes	PMID:9299045			Approved	no
	Call Number	refbase @ user @			Serial	697
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	Author	Kaseda, Y.; Ogawa, H.; Khalil, A.M.
	Title	Causes of natal dispersal and emigration and their effects on harem formation in Misaki feral horses			Type	Journal Article
	Year	1997	Publication	Equine Veterinary Journal	Abbreviated Journal	Equine Vet J
	Volume	29	Issue	4	Pages	262-266
	Keywords	Age Factors; Animal Migration; Animals; Animals, Wild; Behavior, Animal/physiology; Female; Horses/physiology/psychology; Male; Reproduction; Seasons; Sexual Behavior, Animal; *Social Behavior
	Abstract	Misaki feral horses were separated into 2 herds and the difference between dispersal from natal group (natal dispersal) and dispersal from natal area (natal emigration) was studied. The causes of dispersal and emigration and their effects on harem formation were studied 1979-1994. The number of horses ranged from 73 (mature males: 8, mature females: 26, young males: 8, young females: 3, colt foals: 6, filly foals: 10 and geldings: 12) in 1979 and 86 (mature males: 14, mature females: 37, young males: 12, young females: 7, colt foals: 5, filly foals: 7 and geldings: 4) in 1994 when the present study ended. All 29 males which survived to age 4 years and 58 females which survived to age 3 years left their natal or mother groups at age one to 3. Seventeen of 22 dispersing males and 29 of 39 dispersing females left their natal groups around the birth of their siblings and significant correlations were found between natal dispersal and birth of a sibling. The number of emigrating young males correlated negatively and significantly with the total number of young males in another herd and the number of emigrating young females correlated positively and significantly with the total number of young females in the natal herd. All 13 emigrating stallions which survived to age 5 years formed stable harem groups and a significant correlation was found between natal emigration and harem formation. Twenty-three of 35 resident mares formed stable consort relations with harem stallions and a significant correlation was found between residence and formation of stable consort relations.
	Address	Faculty of Agriculture, Miyazaki University, Miyazaki-shi, 889-21, Japan
	Corporate Author				Thesis
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	Language	English	Summary Language		Original Title
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	Series Volume		Series Issue		Edition
	ISSN	0425-1644	ISBN		Medium
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	Notes	PMID:15338905			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	4630
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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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