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Author |
Shoshani, J.; Kupsky, W.J.; Marchant, G.H. |
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Title |
Elephant brain. Part I: gross morphology, functions, comparative anatomy, and evolution |
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Journal Article |
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Year |
2006 |
Publication |
Brain Research Bulletin |
Abbreviated Journal |
Brain Res Bull |
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Volume |
70 |
Issue |
2 |
Pages |
124-157 |
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Keywords  |
Animals; Brain/*anatomy & histology/blood supply/*physiology; Cats; Chinchilla; Elephants/*anatomy & histology/*physiology; Equidae; *Evolution; Female; Guinea Pigs; Haplorhini; Humans; Hyraxes; Male; Pan troglodytes; Sheep; Wolves |
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Abstract |
We report morphological data on brains of four African, Loxodonta africana, and three Asian elephants, Elephas maximus, and compare findings to literature. Brains exhibit a gyral pattern more complex and with more numerous gyri than in primates, humans included, and in carnivores, but less complex than in cetaceans. Cerebral frontal, parietal, temporal, limbic, and insular lobes are well developed, whereas the occipital lobe is relatively small. The insula is not as opercularized as in man. The temporal lobe is disproportionately large and expands laterally. Humans and elephants have three parallel temporal gyri: superior, middle, and inferior. Hippocampal sizes in elephants and humans are comparable, but proportionally smaller in elephant. A possible carotid rete was observed at the base of the brain. Brain size appears to be related to body size, ecology, sociality, and longevity. Elephant adult brain averages 4783 g, the largest among living and extinct terrestrial mammals; elephant neonate brain averages 50% of its adult brain weight (25% in humans). Cerebellar weight averages 18.6% of brain (1.8 times larger than in humans). During evolution, encephalization quotient has increased by 10-fold (0.2 for extinct Moeritherium, approximately 2.0 for extant elephants). We present 20 figures of the elephant brain, 16 of which contain new material. Similarities between human and elephant brains could be due to convergent evolution; both display mosaic characters and are highly derived mammals. Humans and elephants use and make tools and show a range of complex learning skills and behaviors. In elephants, the large amount of cerebral cortex, especially in the temporal lobe, and the well-developed olfactory system, structures associated with complex learning and behavioral functions in humans, may provide the substrate for such complex skills and behavior. |
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Department of Biology, University of Asmara, P.O. Box 1220, Asmara, Eritrea (Horn of Africa). hezy@bio.uoa.edu.er |
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0361-9230 |
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PMID:16782503 |
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Equine Behaviour @ team @ |
Serial |
2623 |
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Author |
Rumiantsev, S.N. |
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Title |
[Biological function of Clostridium tetani toxin (ecological and evolutionary aspects)] |
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Journal Article |
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Year |
1973 |
Publication |
Zhurnal Evoliutsionnoi Biokhimii i Fiziologii |
Abbreviated Journal |
Zh Evol Biokhim Fiziol |
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Volume |
9 |
Issue |
5 |
Pages |
474-480 |
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Keywords |
Animals; Cats; Chickens; Dogs; Ecology; Evolution; Goats; Guinea Pigs; Haplorhini; Horses; Insectivora; Mice; Perissodactyla; Rabbits; Rats; Sheep; *Tetanus Toxin |
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Russian |
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K voprosu biologicheskoi funktsii toksina Clostridium tetani (ekologicheskie i evolutsionnye aspekty |
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0044-4529 |
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PMID:4203684 |
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Equine Behaviour @ team @ |
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2713 |
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Author |
Jordan, J. |
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Title |
[Modern views on the structure and function of the vomeronasal (Jacobson's) organ in mammals] |
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Journal Article |
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Year |
1970 |
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Otolaryngologia Polska. The Polish Otolaryngology |
Abbreviated Journal |
Otolaryngol Pol |
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Volume |
24 |
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4 |
Pages |
457-462 |
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Keywords |
Animals; Cats; Dogs; Guinea Pigs; Horses; Humans; Mice; Nasal Septum/anatomy & histology/blood supply/cytology/innervation/physiology; Nose/*anatomy & histology/blood supply/innervation/*physiology; Rabbits; Rats; Sheep; Smell |
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Original Title |
Obecne poglady na budowe i czynnosc narzadu lemieszowo-nosowego (Jacobsona) u ssakow |
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0030-6657 |
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PMID:4918960 |
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Equine Behaviour @ team @ |
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4315 |
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Author |
Bell, F.R. |
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Title |
Sleep in the larger domesticated animals |
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Journal Article |
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Year |
1972 |
Publication |
Proceedings of the Royal Society of Medicine |
Abbreviated Journal |
Proc R Soc Med |
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65 |
Issue |
2 |
Pages |
176-177 |
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Keywords |
Animals; Cattle/*physiology; Dreams; Electroencephalography; Goats/*physiology; Horses/*physiology; Posture; Sheep/*physiology; *Sleep; Sleep, REM |
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0035-9157 |
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PMID:4343589 |
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no |
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Call Number |
Equine Behaviour @ team @ |
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2826 |
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Author |
Hoogstraal, H.; Dhanda, V.; Bhat, H.R. |
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Title |
Haemaphysalis (Kaiseriana) davisi sp. n. (Ixodoidea: Ixodidae), a parasite of domestic and wild mammals in Northeastern India, Sikkim, and Burma |
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Journal Article |
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Year |
1970 |
Publication |
The Journal of Parasitology |
Abbreviated Journal |
J Parasitol |
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Volume |
56 |
Issue |
3 |
Pages |
588-595 |
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Keywords |
Animals; Cattle; Cattle Diseases/etiology; Deer; Ecology; Goats; Horse Diseases/etiology; Horses; India; Mammals; Myanmar; Sheep; Sheep Diseases/etiology; Tick Infestations; Ticks/*classification/isolation & purification |
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0022-3395 |
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Notes |
PMID:4246255 |
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no |
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Equine Behaviour @ team @ |
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2736 |
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Author |
Dorzh, C.; Minar, J. |
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Warble flies of the families Oestridae and Gasterophilidae (Diptera) found in the Mongolian People's Republic |
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Journal Article |
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Year |
1971 |
Publication |
Folia Parasitologica |
Abbreviated Journal |
Folia Parasitol (Praha) |
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18 |
Issue |
2 |
Pages |
161-164 |
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Keywords |
Animals; Deer; Diptera/*classification; Duodenum; Ecology; Ectoparasitic Infestations/*veterinary; Goats; Horses; Larva; Mongolia; Nasal Mucosa; Nasopharynx; Pharynx; Sheep |
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0015-5683 |
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PMID:5163213 |
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Equine Behaviour @ team @ |
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2731 |
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Author |
Callinan, A.P. |
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The ecology of the free-living stages of Trichostrongylus axei |
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Journal Article |
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1978 |
Publication |
International Journal for Parasitology |
Abbreviated Journal |
Int J Parasitol |
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8 |
Issue |
6 |
Pages |
453-456 |
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Keywords |
Animals; Ecology; Horses; Larva/growth & development; Sheep; Trichostrongyloidea/*growth & development |
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ISSN |
0020-7519 |
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Notes |
PMID:748218 |
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no |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2697 |
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Author |
McBride, S.D.; Wolf, B. |
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Using multivariate statistical analysis to measure ovine temperament; stability of factor construction over time and between groups of animals |
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Journal Article |
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Year |
2007 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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Volume |
103 |
Issue |
1-2 |
Pages |
45-58 |
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Keywords |
Arena test; Factor analysis; Temperament; Sheep |
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The ovine arena test in conjunction with multivariate statistical analysis (factor analysis) may be a means of measuring ovine temperament for practical purposes. Stability of factor construction over time and between groups of animals is considered to demonstrate trait consistency and is, therefore, one of the first steps in validating a temperament/personality test from this perspective. The aim of this study, therefore, was to assess the stability of factor construction, as a measure of trait consistency, using arena test data from three groups of animals with one group (Group 1) tested repeatedly over three rounds (twice at 8 months and once at 22 months of age). Group 1 consisted of 193 mule (Bluefaced Leicester Sire x Scottish Blackface/Welsh Speckled Face dam), ewe lambs (8 months old). Groups 2 and 3 consisted of 189 and 185 mules, respectively (14 months old). All animals were tested for 6 min in a 13 m x 3 m arena. Factor analysis (varimax rotation) was performed twice on the behavioural data (latency to bleat, total number of vocalisations, distance travelled, time spent in different areas of the arena and number of times crossing in and out of pertinent areas), initially using all data recorded on a per minute basis (`Per Minute') for all 6 min of the test (10 factors extracted) and then using total values (`Total'), the summation of the 6 min for each behaviour measured (4 factors extracted). Stability of factor loadings between rounds and between groups was tested using Kendall's coefficient of concordance. For the `Per Minute' data, 5 out of the 10 factors showed significant (p < 0.05) concordance between rounds whilst 9 out of 10 factors showed significant (p < 0.05) concordance between groups. All four factors generated from the `Total' data demonstrated significant (p < 0.05) concordance between rounds and between groups. The four factors generated from the `Total' data were considered to be of potential merit for future studies. These factors were named--`conspecific motivation-fear', `conspecific motivation-distress', `activity' and `low conspecific motivation'. |
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refbase @ user @ |
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295 |
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Author |
Sibbald, A.M.; Elston, D.A.; Smith, D.J.F.; Erhard, H.W. |
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Title |
A method for assessing the relative sociability of individuals within groups: an example with grazing sheep |
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Journal Article |
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Year |
2005 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
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Volume |
91 |
Issue |
1-2 |
Pages |
57-73 |
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Keywords |
Association; Grazing; Nearest neighbour; Sheep; Sociability; Social behaviour |
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Abstract |
We describe a method for quantifying relative sociability within a group of animals, which is defined as the tendency to be close to others within the group and based on the identification of nearest neighbours. The method is suitable for groups of animals in which all individuals are visible and identifiable and has application as a tool in other areas of behavioural research. A sociability index (SI) is calculated, which is equivalent to the relative proportion of time that an individual spends as the nearest neighbour of other animals in the group and is scaled to have an expectation of 1.0 under the null hypothesis of random mixing. Associated pairs, which are animals seen as nearest neighbours more often than would be expected by chance, are also identified. The method tests for consistency across a number of independent observation periods, by comparison with values obtained from simulations in which animal identities are randomised between observation periods. An experiment is described in which 8 groups of 7 grazing sheep were each observed for a total of 10, one-hour periods and the identities and distances away of the 3 nearest neighbours of each focal animal recorded at 5-min intervals. Significant within-group differences in SIs were found in four of the groups (P < 0.001). SIs calculated using the nearest neighbour, two nearest neighbours or three nearest neighbours, were generally highly correlated within all groups, with little change in the ranking of animals. There were significant negative correlations between SIs and nearest neighbour distances in five of the groups. It was concluded that there was no advantage in recording more than one neighbour to calculate the SI. Advantages of the SI over other methods for measuring sociability and pair-wise associations are discussed. |
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refbase @ user @ |
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317 |
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Author |
Pillot, M.-H.; Deneubourg, J.-L. |
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Title |
Collective movements, initiation and stops: Diversity of situations and law of parsimony |
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Journal Article |
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2010 |
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Behavioural Processes |
Abbreviated Journal |
Behav. Process. |
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84 |
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3 |
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657-661 |
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Collective movement; Decision-making; Sheep |
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The environment of animals is often heterogeneous, containing zones that may be dedicated specifically to resting, drinking or feeding. These functional zones may spread over a more or a less extensive area. Thus, mobile animals may have to move from one patch to another when resources are locally depleted or when they need to change activity. The mechanisms involved in collective movement appear simple at first glance, but a brief reflection shows the real difficulty of the problem in terms of the numerous environmental, physical, physiological and social parameters involved. This review is mainly concerned with collective movements, which are characterised by a directional and temporal coordination, where individuals mutually influence each other, meaning this coordination mainly depends on social interactions ([Huth and Wissel, 1992], [Warburton and Lazarus, 1991], [Couzin and Krause, 2003] and [Couzin et al., 2002]). In literature, two types of movement are discussed: large-scale movement and small-scale movement. First, we define these types of movement and then discuss the behavioural mechanisms involved. Secondly, we show that short and long movement but also moving and stopping may result from the outcome of parameters modulation underpinning collective decision-making. |
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0376-6357 |
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Equine Behaviour @ team @ |
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5088 |
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