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Whiten A.; Byrne, R. W. (eds) |
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Machiavellian Intelligence II – Extensions and Evaluations |
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1997 |
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Cambridge University Press |
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Cambridge |
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Whiten A.; Byrne, R. W. |
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Equine Behaviour @ team @ |
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5233 |
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Palme, R.; Moestl, E. |
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Title |
Measurement of cortisol metabolites in faeces of sheep as a parameter of cortisol concentration in blood |
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1997 |
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Zeitschrift für Säugetierkunde |
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J. Mammal. Biol. |
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62 |
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192-197 |
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glucocorticoids, metabolites, animal biology, sheep, immunoenzyme techniques, |
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Equine Behaviour @ team @ |
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6044 |
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Huber, R.; van Staaden, M.J.; Kaufman, L.S.; Liem, K.F. |
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Title |
Microhabitat Use, Trophic Patterns, and the Evolution of Brain Structure in African Cichlids |
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Journal Article |
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1997 |
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Brain, Behavior and Evolution |
Abbreviated Journal |
Brain Behav Evol |
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50 |
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3 |
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167-182 |
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The species assemblages of cichlids in the three largest African Great Lakes are among the richest concentrations of vertebrate species on earth. The faunas are broadly similar in terms of trophic diversity, species richness, rates of endemism, and taxonomic composition, yet they are historically independent of each other. Hence, they offer a true and unique evolutionary experiment to test hypotheses concerning the mutual dependencies of ecology and brain morphology. We examined the brains of 189 species of cichlids from the three large lakes: Victoria, Tanganyika, and Malawi. A first paper demonstrated that patterns of evolutionary change in cichlid brain morphology are similar across taxonomic boundaries as well as across the three lakes [van Staaden et al., 1995 ZACS 98: 165–178]. Here we report a close relationship between the relative sizes of various brain structures and variables related to the utilization of habitat and prey. Causality is difficult to assign in this context, nonetheless, prey size and agility, turbidity levels, depth, and substrate complexity are all highly predictive of variation in brain structure. Areas associated with primary sensory functions such as vision and taste relate significantly to differences in feeding habits. Turbidity and depth are closely associated with differences in eye size, and large eyes are associated with species that pick plankton from the water column. Piscivorous taxa and others that utilize motile prey are characterized by a well developed optic tectum and a large cerebellum compared to species that prey on molluscs or plants. Structures relating to taste are well developed in species feeding on benthos over muddy or sandy substrates. The data militated against the existence of compensatory changes in brain structure. Thus enhanced development of a particular function is generally not accompanied by a parallel reduction of structures related to other modalities. Although genetic and environmental influences during ontogeny of the brain cannot be isolated, this study provides a rich source of hypotheses concerning the way the nervous system functions under various environmental conditions and how it has responded to natural selection. |
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0006-8977 |
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Equine Behaviour @ team @ |
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5454 |
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Author |
Dulac, C. |
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Title |
Molecular biology of pheromone perception in mammals |
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Journal Article |
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Year |
1997 |
Publication |
Seminars in Cell & Developmental Biology |
Abbreviated Journal |
Semin Cell Dev Biol |
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8 |
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2 |
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197-205 |
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accessory olfactory bulb; olfaction; olfactory receptor; pheromone; vomeronasal |
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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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refbase @ user @ |
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797 |
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Author |
Delacour, J. |
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Title |
Object Perception and Recognition: A Model for the Scientific Study of Consciousness |
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Journal Article |
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Year |
1997 |
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Theory Psychology |
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7 |
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2 |
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257-262 |
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The main obstacles to the scientific study of consciousness are its subjectivity and its complexity. Object perception and recognition (OPR) can be a useful model in such a study because there is a remarkable agreement between the subjective and objective aspects of OPR; in addition, while OPR is somewhat simpler than other forms of cognition, it adequately represents one characteristic feature of consciousness: intentionality. It thus allows convergent studies of experimental psychology, artificial intelligence and biology, in both humans and animals. Recent advances in the neurophysiology of visual OPR in subhuman primates and its brain imaging in humans provide a vital thread to the neural basis of consciousness, especially of its integrative, unifying character. |
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10.1177/0959354397072007 |
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Equine Behaviour @ team @ |
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2967 |
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Author |
Slabbert, J.M.; Rasa, O.A.E. |
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Title |
Observational learning of an acquired maternal behaviour pattern by working dog pups: an alternative training method? |
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Journal Article |
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Year |
1997 |
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Applied Animal Behaviour Science |
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Appl. Anim. Behav. Sci. |
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53 |
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4 |
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309-316 |
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Dog; Learning; Parental behaviour; Narcotics |
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German shepherd pups from untrained bitches and bitches trained in the location of narcotics were either separated from their mothers at 6 weeks (standard raised) or at 3 months of age (extended maternal care). Pups with extended maternal care which were allowed to observe their trained mothers locating and retrieving a sachet of odour-producing narcotic between the ages of 6 and 12 weeks performed the same task significantly better than non-exposed pups when tested at the age of 6 months, without further reinforcement during the interim period. This difference in performance was independent of the duration of maternal care or maternal origin of the pups and was attributed to differences in early experience acquired through observational learning. |
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0168-1591 |
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Equine Behaviour @ team @ |
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5225 |
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Author |
Gallup, G.G.J. |
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On the rise and fall of self-conception in primates |
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1997 |
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Annals of the New York Academy of Sciences |
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Ann N Y Acad Sci |
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818 |
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72-82 |
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Animals; Phylogeny; Primates/*psychology; *Self Concept |
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Department of Psychology, State University of New York at Albany 12222, USA |
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0077-8923 |
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PMID:9237466 |
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Equine Behaviour @ team @ |
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4134 |
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Author |
Stephens, D.W.; Anderson, J.P.; Benson, K.E. |
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On the spurious occurrence of Tit for Tat in pairs of predator-approaching fish |
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1997 |
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Animal Behaviour. |
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Anim. Behav. |
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53 |
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1 |
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113-131 |
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An experimental analysis of the movements of predator-approaching fish is presented. The experiments evaluated two competing hypotheses. (1) Predator-approaching fish play the game-theoretical strategy Tit for Tat. Alternatively, (2) the movements of predator-approaching fish superficially resemble Tit for Tat, because fish independently orient to a predator and simultaneously attempt to stay close together. Experimental subjects were mosquito fish,Gambusia affinisapproaching a green sunfish,Lepomis cyanellusTwo experiments were performed. Experiment 1 replicated results of Milinski (1987) and Dugatkin (1991), showing thatGambusiacome closer to a visible predator when a mirror is oriented parallel to their direction of travel. Experiment 2 attempted to separate the effects of common orientation and social cohesion in accounting for the frequency of Tit-for-Tat-like motions in pairs of predator-approachingGambusia. Results of experiment 2 suggest that a simple additive combination of the effects of (1) social cohesion in the absence of a visible predator and (2) orientation to a visible predator in the absence of a visible companion can account for the observed frequency of Tit-for-Tat-like motions for pairs of predator-approachingGambusia. It is concluded that predator approach in shoaling fishes is probably a simple by-product mutualism, rather than cooperation maintained by reciprocity in a Prisoner's Dilemma. |
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refbase @ user @ |
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486 |
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Livoreil, B.; Giraldeau, L. |
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Patch departure decisions by spice finches foraging singly or in groups |
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1997 |
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Animal Behaviour. |
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Anim. Behav. |
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54 |
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4 |
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967-977 |
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The marginal value theorem predicts that when resources are clumped in space, a forager can maximize its rate of intake by deciding to leave a patch when its current feeding rate falls below the average for the habitat. A group version of the model predicts that when rate-maximizing group members share a patch, they should leave sooner, and each with less gain, than single animals exploiting the same patch. We tested these predictions in the laboratory by measuring patch departure decisions of spice finches, Lonchura punctulataexploiting food patches alone or in groups of three under two habitats that require different travel times. As predicted, group members left the patch sooner and with fewer seeds than single foragers. Unlike the model's assumptions, however, birds did not share the patch equally, and their exploitation curves could not be simply derived from those of single foragers. Grouping decreased the effect of travel time on patch exploitation. Moreover, within each group the bird expected to leave first delayed its departure although it collected fewer seeds than the others. This delayed departure could aim to maintain group membership. We noted an increased variability in seed number collected by group members compared with single foragers, which could be a cost of group foraging.Copyright 1997 The Association for the Study of Animal Behaviour1997The Association for the Study of Animal Behaviour |
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Department of Biology, Concordia University |
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0003-3472 |
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PMID:9344448 |
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2138 |
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unknown |
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Personality and Personality Disorders |
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1997 |
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Behavioural Genetics |
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195-207 |
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W. H. Freeman and Company |
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New York |
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Plomin, R.; DeFries, J.C.; McClearn, G.E.;Rutter, M. |
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Equine Behaviour @ team @ |
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4283 |
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