Records |
Author |
Dunbar, R. |
Title |
Evolution of the social brain |
Type |
Journal Article |
Year |
2003 |
Publication |
Science |
Abbreviated Journal |
Science |
Volume |
302 |
Issue |
5648 |
Pages |
1160-1161 |
Keywords |
Animals; Animals, Wild; *Cognition; Endorphins/physiology; *Evolution; Female; Grooming; Hierarchy, Social; Language; Neocortex/anatomy & histology/physiology; Papio/physiology/*psychology; *Reproduction; *Social Behavior; Social Dominance; Social Support; Vocalization, Animal |
Abstract |
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Address |
School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, UK. rimd@liv.ac.uk |
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Thesis |
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Language |
English |
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Series Editor |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1095-9203 |
ISBN |
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Conference |
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Notes |
PMID:14615522 |
Approved |
no |
Call Number |
refbase @ user @ |
Serial |
548 |
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Author |
Isenbugel, E. |
Title |
[From wild horse to riding horse] |
Type |
Journal Article |
Year |
2002 |
Publication |
Schweizer Archiv fur Tierheilkunde |
Abbreviated Journal |
Schweiz Arch Tierheilkd |
Volume |
144 |
Issue |
7 |
Pages |
323-329 |
Keywords |
Animal Husbandry/*history; Animals; Animals, Domestic; Animals, Wild; *Bonding, Human-Pet; Breeding/history; Evolution; Female; History, 15th Century; History, 16th Century; History, 17th Century; History, 18th Century; History, 19th Century; History, 20th Century; History, Ancient; History, Medieval; *Horses/physiology/psychology; Humans; Male; Paintings; Predatory Behavior; Sculpture; Sports/history |
Abstract |
Over 45 million years of evolution the horse developed to a highly specialized animal in anatomy, physiology and behavior. No other animal had influenced the economic and cultural history of men to such extent. Hunting prey since the ice age, domesticated 4000 B.C. and used for thousands of years as unique animal all over the world has attained a new role today as partner in sport, as companion animal and even as cotherapeutic. The well known behavioral demands in use and keeping are still often not fulfilled. |
Address |
Zoologischer Garten Zurich |
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Thesis |
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Place of Publication |
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Editor |
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Language |
German |
Summary Language |
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Original Title |
Vom Wildpferd zum Reitpferd |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0036-7281 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
PMID:12174680 |
Approved |
no |
Call Number |
refbase @ user @ |
Serial |
1913 |
Permanent link to this record |
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Author |
Cameron, E.Z. |
Title |
Facultative adjustment of mammalian sex ratios in support of the Trivers-Willard hypothesis: evidence for a mechanism |
Type |
Journal Article |
Year |
2004 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
Volume |
271 |
Issue |
1549 |
Pages |
1723-1728 |
Keywords |
Age Factors; Animals; Body Constitution; *Evolution; Female; Glucose/metabolism/physiology; Litter Size; Male; Mammals/*physiology; *Models, Biological; Reproduction/physiology; Seasons; Sex Factors; *Sex Ratio; Time Factors |
Abstract |
Evolutionary theory predicts that mothers of different condition should adjust the birth sex ratio of their offspring in relation to future reproductive benefits. Published studies addressing variation in mammalian sex ratios have produced surprisingly contradictory results. Explaining the source of such variation has been a challenge for sex-ratio theory, not least because no mechanism for sex-ratio adjustment is known. I conducted a meta-analysis of previous mammalian sex-ratio studies to determine if there are any overall patterns in sex-ratio variation. The contradictory nature of previous results was confirmed. However, studies that investigated indices of condition around conception show almost unanimous support for the prediction that mothers in good condition bias their litters towards sons. Recent research on the role of glucose in reproductive functioning have shown that excess glucose favours the development of male blastocysts, providing a potential mechanism for sex-ratio variation in relation to maternal condition around conception. Furthermore, many of the conflicting results from studies on sex-ratio adjustment would be explained if glucose levels in utero during early cell division contributed to the determination of offspring sex ratios. |
Address |
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa. ezcameron@zoology.up.ac.za |
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English |
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Series Volume |
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Edition |
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ISSN |
0962-8452 |
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Conference |
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Notes |
PMID:15306293 |
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no |
Call Number |
refbase @ user @ |
Serial |
413 |
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Author |
Barrett, L.; Henzi, P. |
Title |
The social nature of primate cognition |
Type |
Journal Article |
Year |
2005 |
Publication |
Proceedings. Biological Sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
Volume |
272 |
Issue |
1575 |
Pages |
1865-1875 |
Keywords |
Animals; Brain/anatomy & histology/*physiology; Cognition/*physiology; *Evolution; Intelligence/*physiology; Primates/*physiology; *Social Behavior |
Abstract |
The hypothesis that the enlarged brain size of the primates was selected for by social, rather than purely ecological, factors has been strongly influential in studies of primate cognition and behaviour over the past two decades. However, the Machiavellian intelligence hypothesis, also known as the social brain hypothesis, tends to emphasize certain traits and behaviours, like exploitation and deception, at the expense of others, such as tolerance and behavioural coordination, and therefore presents only one view of how social life may shape cognition. This review outlines work from other relevant disciplines, including evolutionary economics, cognitive science and neurophysiology, to illustrate how these can be used to build a more general theoretical framework, incorporating notions of embodied and distributed cognition, in which to situate questions concerning the evolution of primate social cognition. |
Address |
School of Biological Sciences, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK. louiseb@liv.ac.uk |
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English |
Summary Language |
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Series Editor |
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Series Volume |
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Series Issue |
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ISSN |
0962-8452 |
ISBN |
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Conference |
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Notes |
PMID:16191591 |
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no |
Call Number |
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Serial |
2086 |
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Author |
Joffe, T.H.; Dunbar, R.I. |
Title |
Visual and socio-cognitive information processing in primate brain evolution |
Type |
Journal Article |
Year |
1997 |
Publication |
Proceedings. Biological Sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
Volume |
264 |
Issue |
1386 |
Pages |
1303-1307 |
Keywords |
Animals; Brain/anatomy & histology/*physiology; Cognition/physiology; *Evolution; Geniculate Bodies/anatomy & histology/physiology; Humans; Mental Processes/physiology; Neocortex/physiology; Primates/anatomy & histology/*physiology/*psychology; *Social Behavior; Visual Cortex/anatomy & histology/physiology |
Abstract |
Social group size has been shown to correlate with neocortex size in primates. Here we use comparative analyses to show that social group size is independently correlated with the size of non-V1 neocortical areas, but not with other more proximate components of the visual system or with brain systems associated with emotional cueing (e.g. the amygdala). We argue that visual brain components serve as a social information 'input device' for socio-visual stimuli such as facial expressions, bodily gestures and visual status markers, while the non-visual neocortex serves as a 'processing device' whereby these social cues are encoded, interpreted and associated with stored information. However, the second appears to have greater overall importance because the size of the V1 visual area appears to reach an asymptotic size beyond which visual acuity and pattern recognition may not improve significantly. This is especially true of the great ape clade (including humans), that is known to use more sophisticated social cognitive strategies. |
Address |
School of Life Sciences, University of Liverpool, UK |
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English |
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Series Issue |
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Edition |
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ISSN |
0962-8452 |
ISBN |
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Medium |
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Area |
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Conference |
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Notes |
PMID:9332015 |
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no |
Call Number |
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Serial |
2095 |
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Author |
Thrower, W.R. |
Title |
Aggression in horses |
Type |
Journal Article |
Year |
1970 |
Publication |
Proceedings of the Royal Society of Medicine |
Abbreviated Journal |
Proc R Soc Med |
Volume |
63 |
Issue |
2 |
Pages |
163-167 |
Keywords |
*Aggression; Animals; Behavior, Animal; Breeding; Evolution; *Horses; Humans; Species Specificity; Territoriality |
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English |
Summary Language |
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Edition |
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ISSN |
0035-9157 |
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Notes |
PMID:5462347 |
Approved |
no |
Call Number |
refbase @ user @ |
Serial |
1966 |
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Author |
Garamszegi, L.Z.; Møller, A.P.; Erritzøe, J. |
Title |
Coevolving avian eye size and brain size in relation to prey capture and nocturnality |
Type |
Journal Article |
Year |
2002 |
Publication |
Proceedings of the Royal Society of London. Series B: Biological Sciences |
Abbreviated Journal |
Proc Roy Soc Lond B Biol Sci |
Volume |
269 |
Issue |
1494 |
Pages |
961-967 |
Keywords |
adaptation; behaviour; brain size; coevolution; eye size; vision |
Abstract |
Behavioural adaptation to ecological conditions can lead to brain size evolution. Structures involved in behavioural visual information processing are expected to coevolve with enlargement of the brain. Because birds are mainly vision–oriented animals, we tested the predictions that adaptation to different foraging constraints can result in eye size evolution, and that species with large eyes have evolved large brains to cope with the increased amount of visual input. Using a comparative approach, we investigated the relationship between eye size and brain size, and the effect of prey capture technique and nocturnality on these traits. After controlling for allometric effects, there was a significant, positive correlation between relative brain size and relative eye size. Variation in relative eye and brain size were significantly and positively related to prey capture technique and nocturnality when a potentially confounding variable, aquatic feeding, was controlled statistically in multiple regression of independent linear contrasts. Applying a less robust, brunching approach, these patterns also emerged, with the exception that relative brain size did not vary with prey capture technique. Our findings suggest that relative eye size and brain size have coevolved in birds in response to nocturnal activity and, at least partly, to capture of mobile prey. |
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10.1098/rspb.2002.1967 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
5452 |
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Author |
Barton, R.A. |
Title |
Neocortex size and behavioural ecology in primates |
Type |
Journal Article |
Year |
1996 |
Publication |
Proceedings of the Royal Society B |
Abbreviated Journal |
Proc. R. Soc. Lond. B |
Volume |
263 |
Issue |
1367 |
Pages |
173-177 |
Keywords |
Animals; *Behavior, Animal; Brain/*anatomy & histology; Cerebral Cortex/*anatomy & histology/*physiology; *Ecology; Evolution; Primates/anatomy & histology/*physiology/psychology; Regression Analysis; Species Specificity |
Abstract |
The neocortex is widely held to have been the focus of mammalian brain evolution, but what selection pressures explain the observed diversity in its size and structure? Among primates, comparative studies suggest that neocortical evolution is related to the cognitive demands of sociality, and here I confirm that neocortex size and social group size are positively correlated once phylogenetic associations and overall brain size are taken into account. This association holds within haplorhine but not strepsirhine primates. In addition, the neocortex is larger in diurnal than in nocturnal primates, and among diurnal haplorhines its size is positively correlated with the degree of frugivory. These ecological correlates reflect the diverse sensory-cognitive functions of the neocortex. |
Address |
Department of Anthropology, University of Durham |
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English |
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ISSN |
0962-8452 |
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Conference |
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Notes |
PMID:8728982 |
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no |
Call Number |
Equine Behaviour @ team @ |
Serial |
4783 |
Permanent link to this record |
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Author |
Scheffer, M.; van Nes, E.H. |
Title |
Self-organized similarity, the evolutionary emergence of groups of similar species |
Type |
Journal Article |
Year |
2006 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc. Natl. Acad. Sci. U.S.A. |
Volume |
103 |
Issue |
16 |
Pages |
6230-6235 |
Keywords |
Animals; *Competitive Behavior; *Ecosystem; *Evolution; *Models, Biological |
Abstract |
Ecologists have long been puzzled by the fact that there are so many similar species in nature. Here we show that self-organized clusters of look-a-likes may emerge spontaneously from coevolution of competitors. The explanation is that there are two alternative ways to survive together: being sufficiently different or being sufficiently similar. Using a model based on classical competition theory, we demonstrate a tendency for evolutionary emergence of regularly spaced lumps of similar species along a niche axis. Indeed, such lumpy patterns are commonly observed in size distributions of organisms ranging from algae, zooplankton, and beetles to birds and mammals, and could not be well explained by earlier theory. Our results suggest that these patterns may represent self-constructed niches emerging from competitive interactions. A corollary of our findings is that, whereas in species-poor communities sympatric speciation and invasion of open niches is possible, species-saturated communities may be characterized by convergent evolution and invasion by look-a-likes. |
Address |
Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 8080, 6700 DD, Wageningen, The Netherlands. marten.scheffer@wur.nl |
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English |
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Edition |
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ISSN |
0027-8424 |
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Notes |
PMID:16585519 |
Approved |
no |
Call Number |
refbase @ user @ |
Serial |
510 |
Permanent link to this record |
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Author |
Bergstrom, C.T.; Lachmann, M. |
Title |
Signaling among relatives. III. Talk is cheap |
Type |
Journal Article |
Year |
1998 |
Publication |
Proceedings of the National Academy of Sciences of the United States of America |
Abbreviated Journal |
Proc. Natl. Acad. Sci. U.S.A. |
Volume |
95 |
Issue |
9 |
Pages |
5100-5105 |
Keywords |
Animal Communication; Animals; Costs and Cost Analysis; *Evolution; Interpersonal Relations; Models, Biological |
Abstract |
The Sir Philip Sidney game has been used by numerous authors to show how signal cost can facilitate honest signaling among relatives. Here, we demonstrate that, in this game, honest cost-free signals are possible as well, under very general conditions. Moreover, these cost-free signals are better for all participants than the previously explored alternatives. Recent empirical evidence suggests that begging is energetically inexpensive for nestling birds; this finding led some researchers to question the applicability of the costly signaling framework to nestling begging. Our results show that cost-free or inexpensive signals, as observed empirically, fall within the framework of signaling theory. |
Address |
Department of Biological Sciences, Stanford University, Stanford, CA 94305, USA. carl@charles.stanford.edu |
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English |
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ISSN |
0027-8424 |
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Notes |
PMID:9560235 |
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no |
Call Number |
refbase @ user @ |
Serial |
561 |
Permanent link to this record |