| Records |
| Author |
Berger J, |
| Title |
Reproductive fates of dispersers in a harem-dwelling ungulate: the wild horse |
Type |
Journal Article |
| Year |
1987 |
Publication |
Mammalian Dispersal Patterns: The Effects of Social Structure on Population Genetics |
Abbreviated Journal  |
Mammalian dispersal Patterns |
| Volume |
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Issue |
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Pages |
41-54 |
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| Abstract |
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Place of Publication |
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Editor |
Chepko-Sade, B.D. ; Halpin, Z.T. |
| Language |
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Original Title |
Mammalian Dispersal Patterns: The Effects of Social Structure on Population Genetics |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
940 |
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| Author |
Terrace, H.S. |
| Title |
Chunking by a pigeon in a serial learning task |
Type |
Journal Article |
| Year |
1987 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
325 |
Issue |
7000 |
Pages |
149-151 |
| Keywords |
Animals; Cognition/*physiology; Columbidae/*physiology; Feedback; Learning/*physiology; Male |
| Abstract |
A basic principle of human memory is that lists that can be organized into memorable 'chunks' are easier to remember. Memory span is limited to a roughly constant number of chunks and is to a large extent independent of the amount of informaton contained in each chunk. Depending on the ingenuity of the code used to integrate discrete items into chunks, one can substantially increase the number of items that can be recalled correctly. Newly developed paradigms for studying memory in non-verbal organisms allow comparison of the abilities of human and non-human subjects to memorize lists. Here I present two types of evidence that pigeons 'chunk' 5-element lists whose components (colours and achromatic geometric forms) are clustered into distinct groups. Those lists were learned twice as rapidly as a homogeneous list of colours or heterogeneous lists in which the elements are not clustered. The pigeons were also tested for knowledge of the order of two elements drawn from the 5-element lists. They responded in the correct order only to those subsets that contained a chunk boundary. Thus chunking can be studied profitably in animal subjects; the cognitive processes that allow an organism to form chunks do no presuppose linguistic competence. |
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| Language |
English |
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| ISSN |
0028-0836 |
ISBN |
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| Notes |
PMID:3808071 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2792 |
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| Author |
Penzhorn Bl, |
| Title |
Descriptions of incisors of known – age Cape Mountain Zebras from the Mountain Zebra National park |
Type |
Journal Article |
| Year |
1987 |
Publication |
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Abbreviated Journal |
Onderstepoort J vet Res |
| Volume |
54 |
Issue |
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Pages |
135-141 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1459 |
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| Author |
Enileeva, N.K. |
| Title |
[Ecological characteristics of horse stomach botflies in Uzbekistan] |
Type |
Journal Article |
| Year |
1987 |
Publication |
Parazitologiia |
Abbreviated Journal |
Parazitologiia |
| Volume |
21 |
Issue |
4 |
Pages |
577-579 |
| Keywords |
Animals; Diptera/*physiology; Ecology; Female; Flight, Animal; Horses/*parasitology; Larva/physiology; Male; Population Dynamics; Uzbekistan |
| Abstract |
The paper describes the flight periods and dynamics of abundance of horse botflies, life span of females and males, effect of environmental factors on the activity of flies and their behaviour, potential fecundity of different species of botflies, duration of embryonal development, preservation of viability of larvae in egg membranes, localization of different stages of botflies in the host, and methods of their control. |
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| Language |
Russian |
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Original Title |
Ekologicheskie osobennosti zheludochnykh ovodov loshadei v Uzbekistane |
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Edition |
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| ISSN |
0031-1847 |
ISBN |
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Medium |
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Conference |
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| Notes |
PMID:2958767 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2680 |
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| Author |
Wasserman, S. |
| Title |
Conformity of two sociometric relations |
Type |
Journal Article |
| Year |
1987 |
Publication |
Psychometrika |
Abbreviated Journal |
Psychometrika |
| Volume |
52 |
Issue |
1 |
Pages |
3-18 |
| Keywords |
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| Abstract |
Abstract The problem of comparing two sociometric relations or measurements (A andB) recorded in distinct sociomatrices was originally discussed by Katz and Powell in the early 1950's and Hubert and Baker in the late 1970's. The problem is considered again using a probabilistic model designed specifically for discrete-valued network measurements. The model allows for the presence of various structural tendencies, such as reciprocity and differential popularity. A parameter that isolates the tendency for actors to choose other actors on both relations simultaneously is introduced, and estimated conditional on the presence of other parameters that reflect additional important network properties. The parameter is presented as a symmetric index but is also generalized to the predictive (A onB orB onA) situation. This approach to the problem is illustrated with the same data used by the earlier solutions, and the unique nature of the two relations in the data set (A = received choices,B = perceived choices), as it affects the modeling, is discussed. Significance tests for the parameter and related parameters are described, as well as an extension to more than two relations. |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5027 |
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| Author |
Olivier W, |
| Title |
Is it possible to bring back the quagga? |
Type |
Journal Article |
| Year |
1987 |
Publication |
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Abbreviated Journal |
Roan News |
| Volume |
4 |
Issue |
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Pages |
1-2 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1435 |
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| Author |
Penzhorn Bl, G.R. |
| Title |
Incisor wear in free – ranging Cape mountain zebras |
Type |
Journal Article |
| Year |
1987 |
Publication |
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Abbreviated Journal |
S Afr J Wildl Res |
| Volume |
17 |
Issue |
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Pages |
99-102 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
Approved |
no |
| Call Number |
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Serial |
1461 |
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| Author |
Illius,A. W.; Gordon, I. J. |
| Title |
The Allometry of Food Intake in Grazing Ruminants |
Type |
Journal Article |
| Year |
1987 |
Publication |
The Journal of Animal Ecology |
Abbreviated Journal |
T. J. Anim. Ecol. |
| Volume |
56 |
Issue |
3 |
Pages |
989-999 |
| Keywords |
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| Abstract |
A simulation model of grazing mechanics in ruminants shows that, due to the allometric relations of bite size and metabolic requirements to body size, small animals are able to subsist on shorter swards than large animals. (2) The density of nutrients in the grazed horizon of the modelled swards markedly affected the ability of animals of a given body size to satisfy their energy requirements. (3) By extension, the allometric relationships would be expected to apply in selective grazing and browsing species in their choice of food items of different size and nutrient content. (4) The results support the argument that sexual segregation and habitat choice of dimorphic species is an effect of scramble competition for limited resources, the males thus being excluded from mutually preferred swards. (5) The model provides an explanation for two interspecific phenomena amongst grazers: grazing succession and grazing facilitation. |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
4265 |
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| Author |
Pusey, A.E. |
| Title |
Sex-biased dispersal and inbreeding avoidance in birds and mammals |
Type |
Journal Article |
| Year |
1987 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
| Volume |
2 |
Issue |
10 |
Pages |
295-299 |
| Keywords |
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| Abstract |
Sex differences in dispersal distance are widespread in birds and mammals, but the predominantly dispersing sex differs consistently between the classes. There has been persistent debate over the relative importance of two factors -- intrasexual competition and inbreeding avoidance -- in producing sex-biased dispersal, and over the sources of the difference in dispersal patterns between the two classes. Recent studies cast new light on these questions. |
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Edition |
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| ISSN |
0169-5347 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5326 |
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| Author |
Hughes, K.L.; Sulaiman, I. |
| Title |
The ecology of Rhodococcus equi and physicochemical influences on growth |
Type |
Journal Article |
| Year |
1987 |
Publication |
Veterinary Microbiology |
Abbreviated Journal |
Vet Microbiol |
| Volume |
14 |
Issue |
3 |
Pages |
241-250 |
| Keywords |
Animals; Feces/microbiology; Horses; Hydrogen-Ion Concentration; Rhodococcus/*growth & development; *Soil Microbiology; Temperature |
| Abstract |
Growth of Rhodococcus equi was studied in vitro. Optimal growth occurred under aerobic conditions between pH 7.0 and 8.5, at 30 degrees C. R. equi survived better in a neutral soil (pH 7.3) than it did in two acid soils (pH less than 5.5). It grew substantially better in soils enriched with faeces than in soils alone. Simple organic acids in horse dung, especially acetate and propionate, appear to be important in supporting growth of R. equi in the environment. The ecology of R. equi can be best explained by an environmental cycle allowing its proliferation in dung, influenced by management, grazing behaviour and prevailing climatic conditions. Preventive measures should be aimed at reducing or avoiding focal areas of faecal contamination in the environment. |
| Address |
School of Veterinary Science, University of Melbourne, Parkville, Vic., Australia |
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English |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0378-1135 |
ISBN |
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| Notes |
PMID:3672866 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
2678 |
| Permanent link to this record |
