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Author |
Shultz, S.; Finlayson, L.V. |
Title |
Large body and small brain and group sizes are associated with predator preferences for mammalian prey |
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Journal Article |
Year |
2010 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
Behav. Ecol. |
Volume |
21 |
Issue |
5 |
Pages |
1073-1079 |
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Abstract |
Predation is a major force in shaping biological communities, both over ecological and evolutionary timescales. In response to predation pressure, prey have evolved characteristics designed to mitigate predation pressure. We evaluated predator foraging biases in relation to prey characteristics across 16 vertebrate communities. We show that although predator biases vary, some prey traits are consistently associated with predator diet composition. Within their acceptable prey size range, predators show positive bias toward larger bodied prey, small-brained prey (controlling for body size), small group size, and terrestriality. Thus, whether predator foraging decisions are passive or active, predator choice exerts differential pressure on prey species according to prey characteristics. Predator biases also were positively associated with early age at maturity, supporting the role of mortality in driving life-history characteristics. These results support several theoretical models of predation including its role as a selective force driving evolutionary changes in life history, brain size and sociality, optimal diet theory, and antiapostatic predation. |
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10.1093/beheco/arq108 |
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Equine Behaviour @ team @ |
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5262 |
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Smith, J.E.; Van Horn, R.C.; Powning, K.S.; Cole, A.R.; Graham, K.E.; Memenis, S.K.; Holekamp, K.E. |
Title |
Evolutionary forces favoring intragroup coalitions among spotted hyenas and other animals |
Type |
Journal Article |
Year |
2010 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
Behav. Ecol. |
Volume |
21 |
Issue |
2 |
Pages |
284-303 |
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Abstract |
Coalitionary support in agonistic interactions represents cooperation because intervening in a fight is potentially costly to the donor of support but benefits the recipient. Here, we first review the characteristics of, and evolutionary forces favoring, intragroup coalitions in 49 species and find that patterns of intragroup coalition formation are remarkably similar between primates and nonprimates. We then test hypotheses suggesting kin selection, reciprocal altruism, and direct benefits as adaptive explanations for coalitionary interventions among adult female spotted hyenas (Crocuta crocuta) belonging to a large social group in Kenya. As predicted by kin selection theory, females supported close kin most often, and the density (connectedness) of cooperation networks increased with genetic relatedness. Nevertheless, kinship failed to protect females from coalitionary attacks. We found no evidence of enduring alliances based on reciprocal support among unrelated adult females. Instead, donors generally minimized costs to themselves, intervening most often during low-intensity fights and when feeding opportunities were unavailable. Females also gained direct benefits from directing coalitionary attacks toward subordinates. Finally, females monitored the number of dominant bystanders in the “audience” at fights and modified their level of cooperation based on this knowledge. Overall, hyenas made flexible decisions regarding whether or not to intervene in fights, modifying their tendency to cooperate based on multiple types of information about their immediate social and ecological environments. Taken together, these findings indicate that the combined evolutionary forces of kin selection and direct benefits derived from reinforcing the status quo drive coalitionary interventions among adult female spotted hyenas. |
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agonistic support, audience effect, cooperation network, direct benefits, kin selection * reciprocal altruism * review |
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10.1093/beheco/arp181 |
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no |
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Equine Behaviour @ team @ |
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5285 |
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Dingemanse, N.J.; de Goede, P. |
Title |
The relation between dominance and exploratory behavior is context-dependent in wild great tits |
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Journal Article |
Year |
2004 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
Behav. Ecol. |
Volume |
15 |
Issue |
6 |
Pages |
1023-1030 |
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Individual differences in personality affect behavior in novel or challenging situations. Personality traits may be subject to selection because they affect the ability to dominate others. We investigated whether dominance rank at feeding tables in winter correlated with a heritable personality trait (as measured by exploratory behavior in a novel environment) in a natural population of great tits, Parus major. We provided clumped resources at feeding tables and calculated linear dominance hierarchies on the basis of observations between dyads of color-ringed individuals, and we used an experimental procedure to measure individual exploratory behavior of these birds. We show that fast-exploring territorial males had higher dominance ranks than did slow-exploring territorial males in two out of three samples, and that dominance related negatively to the distance between the site of observation and the territory. In contrast, fast-exploring nonterritorial juveniles had lower dominance ranks than did slow-exploring nonterritorial juveniles, implying that the relation between dominance and personality is context-dependent in the wild. We discuss how these patterns in dominance can explain earlier reported effects of avian personality on natal dispersal and fitness. |
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Equine Behaviour @ team @ |
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5390 |
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Hildenbrandt, H.; Carere, C.; Hemelrijk, C.K. |
Title |
Self-organized aerial displays of thousands of starlings: a model |
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Journal Article |
Year |
2010 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
Behav. Ecol. |
Volume |
21 |
Issue |
6 |
Pages |
1349-1359 |
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Abstract |
Through combining theoretical models and empirical data, complexity science has increased our understanding of social behavior of animals, in particular of social insects, primates, and fish. What are missing are studies of collective behavior of huge swarms of birds. Recently detailed empirical data have been collected of the swarming maneuvers of large flocks of thousands of starlings (Sturnus vulgaris) at their communal sleeping site (roost). Their flocking maneuvers are of dazzling complexity in their changes in density and flock shape, but the processes underlying them are still a mystery. Recent models show that flocking may arise by self-organization from rules of co-ordination with nearby neighbors, but patterns in these models come nowhere near the complexity of those of the real starlings. The question of this paper, therefore, is whether such complex patterns can emerge by self-organization. In our computer model, called StarDisplay, we combine the usual rules of co-ordination based on separation, attraction, and alignment with specifics of starling behavior: 1) simplified aerodynamics of flight, especially rolling during turning, 2) movement above a “roosting area” (sleeping site), and 3) the low fixed number of interaction neighbors (i.e., the topological range). Our model generates patterns that resemble remarkably not only qualitative but also quantitative empirical data collected in Rome through video recordings and position measurements by stereo photography. Our results provide new insights into the mechanisms underlying complex flocking maneuvers of starlings and other birds. |
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Equine Behaviour @ team @ |
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5403 |
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Author |
Watt, L. M.; McDonnell, S. M. |
Title |
Demonstration of Concept Formation in the Horse. |
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Report |
Year |
2001 |
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Equine Behavior Laboratory, University of Pennsylvania School of Veterinary Medicine, August 2001 Interim Report. |
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University of Pennsylvania |
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Philadephia |
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Equine Behaviour @ team @ |
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5449 |
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Author |
Krueger, K. |
Title |
Perissodactyla Cognition |
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Book Chapter |
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2017 |
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Encyclopedia of Animal Cognition and Behavior |
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1-10 |
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Springer International Publishing |
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Cham |
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Vonk, J.; Shackelford, T. |
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978-3-319-47829-6 |
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Equine Behaviour @ team @ Krueger2017 |
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6187 |
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Krueger, K.; Marr, I.; Farmer, K. |
Title |
Equine Cognition |
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2017 |
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Encyclopedia of Animal Cognition and Behavior |
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1-11 |
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Springer International Publishing |
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Vonk, J.; Shackelford, T. |
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978-3-319-47829-6 |
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Equine Behaviour @ team @ Krueger2017 |
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6181 |
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Author |
de Jong, T.R.; Neumann, I.D. |
Title |
Oxytocin and Aggression |
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Book Chapter |
Year |
2018 |
Publication |
Behavioral Pharmacology of Neuropeptides: Oxytocin |
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175-192 |
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The neuropeptide oxytocin (OT) has a solid reputation as a facilitator of social interactions such as parental and pair bonding, trust, and empathy. The many results supporting a pro-social role of OT have generated the hypothesis that impairments in the endogenous OT system may lead to antisocial behavior, most notably social withdrawal or pathological aggression. If this is indeed the case, administration of exogenous OT could be the “serenic” treatment that psychiatrists have for decades been searching for. |
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Springer International Publishing |
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Cham |
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Hurlemann, R.; Grinevich, V. |
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978-3-319-63739-6 |
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Equine Behaviour @ team @ de Jong2018 |
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6424 |
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Author |
Bateson, P. |
Title |
Play, playfulness, creativity and innovation. |
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Journal Article |
Year |
2014 |
Publication |
Animal Behavior and Cognition |
Abbreviated Journal |
Anim. Behav. Cogn. |
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1 |
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2 |
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99-112 |
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Equine Behaviour @ team @ |
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6553 |
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Author |
Morley, K.I.; Montgomery, G.W. |
Title |
The genetics of cognitive processes: candidate genes in humans and animals |
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Journal Article |
Year |
2001 |
Publication |
Behavior Genetics |
Abbreviated Journal |
Behav Genet |
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31 |
Issue |
6 |
Pages |
511-531 |
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Animals; *Chromosome Mapping; Drosophila melanogaster; Genetic Markers/*genetics; Humans; Intelligence/*genetics; Mental Retardation/genetics; Mice; Phenotype; Quantitative Trait, Heritable |
Abstract |
It has been hypothesized that numerous genes contribute to individual variation in human cognition. An extensive search of the scientific literature was undertaken to identify candidate genes which might contribute to this complex trait. A list of over 150 candidate genes that may influence some aspect of cognition was compiled. Some genes are particularly strong candidates based on evidence for involvement in cognitive processes in humans, mice, and Drosophila melanogaster. This survey confirms that many genes are associated with cognitive variation and highlights the potential importance of animal models in the study of human cognition. |
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Genetic Epidemiology Laboratory, Queensland Institute of Medical Research, Brisbane, Australia |
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English |
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0001-8244 |
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PMID:11838530 |
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Equine Behaviour @ team @ |
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4141 |
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