| Records |
| Author |
Noë, R.; Hammerstein, P. |
| Title |
Biological markets: supply and demand determine the effect of partner choice in cooperation, mutualism and mating |
Type |
Journal Article |
| Year |
1994 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
35 |
Issue |
1 |
Pages |
1-11 |
| Keywords |
Biomedical and Life Sciences |
| Abstract |
The formation of collaborating pairs by individuals belonging to two different classes occurs in the contexts of reproduction and intea-specific cooperation as well as of inter-specific mutualism. There is potential for partner choice and for competition for access to preferred partners in all three contexts. These selective forces have long been recognised as important in sexual selection, but their impact is not yet appreciated in cooperative and mutualistic systems. The formation of partnerships between members of different classes has much in common with the conclusion of trade agreements in human markets with two classes of traders, like producers and consumers, or employers and employees. Similar game-theoretical models can be used to predict the behaviour of rational traders in human markets and the evolutionarily stable strategies used in biological markets. We present a formal model in which the influence of the market mechanism on selection is made explicit. We restrict ourselves to biological markets in which: (1) Individuals do not compete over access to partners in an agonistic manner, but rather by outcompeting each other in those aspects that are preferred by the choosing party. (2) The commodity the partner has to offer cannot be obtained by the use of force, but requires the consent of the partner. These two restrictions ensure a dominant role for partner choice in the formation of partnerships. In a biological market model the decision to cooperate is based on the comparison between the offers of several potential partners, rather than on the behaviour of a single potential partner, as is implicitly assumed in currently accepted models of cooperation. In our example the members of one class A offer a commodity of fixed value in exchange for a commodity of variable value supplied by the other class, B. We show that when the B-class outnumbers the A-class sufficiently and the cost for the A-class to sample the offers of the B-class are low, the choosiness of the A-class will lead to selection for the supply of high value commodities by the B-class (Fig. 3a). Under the same market conditions, but with a high sampling cost this may still be the evolutionariy stable outcome, but another pair of strategies proves to be stable too: relaxed choosiness of class A coupled with low value commodities supplied by class B (Fig. 3b). We give a number of examples of mating, cooperative and mutualistic markets that resemble the low sampling cost situation depicted in Fig. 3a. |
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| Publisher |
Springer Berlin / Heidelberg |
Place of Publication |
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Edition |
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| ISSN |
0340-5443 |
ISBN |
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no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5404 |
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| Author |
Houpt, K. A.; Boyd L. |
| Title |
Social Behaviour |
Type |
Book Chapter |
| Year |
1994 |
Publication |
Przewalski's horse |
Abbreviated Journal |
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Issue |
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Pages |
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| Publisher |
State university of New York Press |
Place of Publication |
Albany |
Editor |
Boyd L.; Houpt, K. A. |
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Summary Language |
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Original Title |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5433 |
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| Author |
Irvine, C.H.G.; Alexander, S.L. |
| Title |
Factors affecting the circadian rhythm in plasma cortisol concentrations in the horse |
Type |
Journal Article |
| Year |
1994 |
Publication |
Domestic Animal Endocrinology |
Abbreviated Journal |
Domest. Anim. Endocrinol. |
| Volume |
11 |
Issue |
2 |
Pages |
227-238 |
| Keywords |
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| Abstract |
In horses, a circadian rhythm in plasma cortisol concentrations has been reported in some but not all studies. When a rhythm occurred, horses were accustomed to a management routine, comprising stabling, feeding and sometimes exercise, which may entrain a circadian pattern. In this work, we monitored plasma cortisol by collecting jugular blood through indwelling cannulae from four groups: 1): 10 untrained, unperturbed mares grazing excess pasture, bled hourly for 26 hr; 2) 4 mares housed in a barn for 48 hr before sampling every 15 min for 20–24 hr; 3) 5 mares placed in an outdoor yard for sampling every 30 min from 0930–2100 hr; and 4) 4 stabled racehorses in training, bled every 30 min from 0730–2000 hr and once the following morning at 0830 hr. Plasma cortisol showed a similarly-timed circadian rhythm (P<0.0001) in all Group 1 horses, with a peak at 0600–0900 hr, and a nadir at 1800–2100 hr. By contrast, cortisol concentrations did not vary with time in either Group 2 or 3. Neither daily mean nor peak cortisol values differed in Group 1 and 2 (i.e. bled for >= 20 hr); however nadir values were higher (P<0.05) in Group 2. In Group 4, cortisol declined (P=0.004) during the sampling period but had returned to initial concentrations the next morning. Values did not differ from those for Group 1, except between 1000 and 1300 hr when cortisol in Group 4 was lower (P<0.05). We conclude that a circadian cortisol rhythm exists in horses in the absence of any known cues imposed by humans. However, this rhythm can be obliterated by the minor perturbation of removing the horse from its accustomed environment. By contrast, the rhythm occurs in trained racehorses, suggesting either that they have adapted to their environment thereby allowing an endogenous rhythm to emerge, or that the rhythm is entrained by their daily routine. These observations highlight the difficulties in determining the cortisol status of a horse, since measurements will be affected by time of day, the occurrence of short-term fluctuations, and how accustomed the horse is to its environment. |
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Edition |
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| ISSN |
0739-7240 |
ISBN |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5590 |
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| Author |
Vlajkoviç, S.; Nikoliç, V.; Nikoliç, A.; Milanoviç, S.žA.; Jankoviç, B.D. |
| Title |
Asymmetrical Modulation of Immune Reactivity in Left- and Right-Biased Rats After Ipsilateral Ablation of the Prefrontal, Parietal and Occipital Brain Neocortex |
Type |
Journal Article |
| Year |
1994 |
Publication |
Int J Neurosci |
Abbreviated Journal |
International Journal of Neuroscience |
| Volume |
78 |
Issue |
1-2 |
Pages |
123-134 |
| Keywords |
Brain asymmetry, brain neocortex, cortical ablation, rotational behavior, rotational bias, immune responses, neuroimmunomodulation, neuroimmunology |
| Abstract |
We report here on the lateralized brain immunomodulation in male Wistar rats, a phenomenon related to the rotational bias of animal and the site of cortical lesion. Rats assigned to left- and right-rotators in a cylindrical Plexiglass rotometer were subjected to the ablation of the ipsilateral prefrontal cortex (PFC), parietal cortex (PC) and occipital cortex (OC) and sensitized with bovine serum albumin (BSA) in complete Freund's adjuvant. Intact and sham-lesioned left-biased animals demonstrated increased Arthus and delayed hypersensitivity skin reactions and antibody production to BSA in comparison with corresponding right-biased animals. PFC ablation decreased humoral and cellular immune responses to BSA in left- but increased in right-biased rats. Lesioning of PC decreased humoral immune reactions in left- but increased in right-rotating animals. OC ablation failed to produce immunological abnormalities, These results suggest that immunopotentiation is associated with the left neocortex, and immunosuppression with the right neocortex. The prefrontal cortex appears to be particularly associated with immune reactions. |
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Informa Clin Med |
Place of Publication |
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Edition |
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| ISSN |
0020-7454 |
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| Notes |
doi: 10.3109/00207459408986051 |
Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5777 |
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| Author |
Thun, R.; Schwarz-Porsche, D. |
| Title |
Nebennierenrinde |
Type |
Book Whole |
| Year |
1994 |
Publication |
Veterinärmedizinische Endokrinologie. |
Abbreviated Journal |
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| Volume |
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Issue |
3. Aufl. |
Pages |
309-351 |
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| Publisher |
Verlag Gustav Fischer |
Place of Publication |
Jena, Stuttgart |
Editor |
F.H.Döcke |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
5998 |
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| Author |
Fisher, J.; Hinde, R. A. |
| Title |
The opening of milk bottles by birds |
Type |
Journal Article |
| Year |
1994 |
Publication |
British Birds |
Abbreviated Journal |
British Birds |
| Volume |
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Issue |
42 |
Pages |
347-357 |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
6525 |
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| Author |
Byrne R.W. |
| Title |
The evolution of intelligence |
Type |
Book Chapter |
| Year |
1994 |
Publication |
Behaviour and Evolution |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
223-265 |
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Cambridge University Press |
Place of Publication |
Cambridge,UK |
Editor |
P.J.B. Slater and T.R. Halliday |
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Approved |
no |
| Call Number |
Equine Behaviour @ team @ |
Serial |
6566 |
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| Author |
Aviad, A.D.; Houpt, J.B. |
| Title |
The molecular weight of therapeutic hyaluronan (sodium hyaluronate): how significant is it? |
Type |
Journal Article |
| Year |
1994 |
Publication |
The Journal of rheumatology |
Abbreviated Journal |
J Rheumatol |
| Volume |
21 |
Issue |
2 |
Pages |
297-301 |
| Keywords |
Animals; Horse Diseases/drug therapy; Horses; Humans; Hyaluronic Acid/*chemistry/*therapeutic use; Joint Diseases/*drug therapy/veterinary; Molecular Weight; Osteoarthritis/drug therapy/veterinary; Synovial Fluid/drug effects/physiology; Viscosity |
| Abstract |
Various molecular weight hyaluronic acid (HA) preparations have been injected into joints for the treatment of human and equine osteoarthritis. A therapeutic advantage has been claimed for commercial products with a molecular weight in the range found in normal synovial fluid (SF), compared to lower molecular weight products. But a correlation between molecular weight and efficacy is not borne out by an analysis of the available literature on clinical results. SF viscosity, HA concentration, HA molecular weight and rate of synthesis in joint disease. It is proposed that the beneficial effect of injected HA in joint disease may be due to pharmacological rather than to physical properties. |
| Address |
Rheumatic Disease Unit, Mount Sinai Hospital, University of Toronto, ON, Canada |
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Thesis |
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Place of Publication |
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| Language |
English |
Summary Language |
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Original Title |
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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 |
0315-162X |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
PMID:8182640 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
35 |
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| Author |
Judge, P.G.; de Waal, F.B.; Paul, K.S.; Gordon, T.P. |
| Title |
Removal of a trauma-inflicting alpha matriline from a group of rhesus macaques to control severe wounding |
Type |
Journal Article |
| Year |
1994 |
Publication |
Laboratory animal science |
Abbreviated Journal |
Lab Anim Sci |
| Volume |
44 |
Issue |
4 |
Pages |
344-350 |
| Keywords |
*Aggression; Animals; Female; *Macaca mulatta; Male; *Monkey Diseases; *Social Dominance; Wounds and Injuries/epidemiology/prevention & control/*veterinary |
| Abstract |
Wounding in an 83-member group of rhesus macaques (Macaca mulatta) housed at the Yerkes Regional Primate Research Center Field Station became excessive to the point that intervention was deemed necessary. When observations indicated that three females from the group's alpha matriline were principally responsible for the wounding, the matriline (N = 7) was removed from the group. This study was conducted to document an atypical pattern of wounding in this group and to evaluate the effectiveness of removal as a procedure for controlling injuries. The aggression rates of 21 adult subjects and the wounds of all group members were recorded before and after the removal procedure and compared with those in a similar-sized group. Removing the alpha matriline did not alter aggression rates in the group or the rank order among the remaining matrilines. Aggression rates in the experimental group were also not significantly different from those in the comparison group before or after the removal. With the alpha matriline present, wounding levels in the group were significantly higher than those in the comparison group. After removal of the matriline, the frequency of wounds decreased significantly to levels similar to those of the comparison group. The pattern of excess wounding attributed to the extracted alpha females was idiosyncratic, involving removal of large patches of skin from the hindquarters of adult females or removal of the distal portion of the fingers, toes, or tail from juveniles.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Address |
Yerkes Regional Primate Research Center, Emory University, Atlanta, GA 30329 |
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| Language |
English |
Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0023-6764 |
ISBN |
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Medium |
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Conference |
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| Notes |
PMID:7983846 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
207 |
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| Author |
Judge, P.G.; de Waal, F.B. |
| Title |
Intergroup grooming relations between alpha females in a population of free-ranging rhesus macaques |
Type |
Journal Article |
| Year |
1994 |
Publication |
Folia primatologica; international journal of primatology |
Abbreviated Journal |
Folia Primatol (Basel) |
| Volume |
63 |
Issue |
2 |
Pages |
63-70 |
| Keywords |
Animals; Animals, Wild; Female; *Grooming; Macaca mulatta/*psychology; Male; Population Density; *Social Behavior |
| Abstract |
Intergroup affiliation among female rhesus macaques, Macaca mulatta, was examined in the captive free-ranging colony of Morgan Island, S.C., USA. The provisioned colony has many social groups (35) and is maintained at a relatively high population density (21 animals/ha) with a relatively low adult male to female ratio (1:8.8). Focal and ad libitum samples were collected on 32 adults (3 males and 29 females) from two groups. Although infrequent, grooming was observed between adult females from different groups, and alpha females were the main participants in these interactions. Colony records indicated that none of the intergroup grooms was between females formerly from a common group. Relations between familiar neighboring groups may be maintained by a combination of both affiliative and aggressive behavior. |
| Address |
Yerkes Regional Primate Research Center, Lawrenceville, Ga 30243 |
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Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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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 |
0015-5713 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
PMID:7813977 |
Approved |
no |
| Call Number |
refbase @ user @ |
Serial |
208 |
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