| Records |
| Author |
Parker, G.A.; Rubenstein, D.I. |
| Title |
Role assessment, reserve strategy, and acquisition of information in asymmetric animal conflicts |
Type |
Journal Article |
| Year |
1981 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
29 |
Issue |
1 |
Pages |
221-240 |
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| Abstract |
It was formerly argued that alternative evolutionarily stable strategies (ESSs) are possible for animal contests characterized by some asymmetry that can be perceived with perfect accuracy. Where roles A and B refer to the asymmetry between opponents, ESSs are: [`]fight when A, retreat when B', and vice versa. Either can be an ESS, but only if the [`]reserve strategy' (=what an animal does when it fights) is sufficiently damaging. We examine the [`]war of attrition' (winner = opponent that persists longer). In a population at either ESS, reserve strategy is never normally shown; it is therefore subject to drift unless the selective action of rare individuals which break the convention is considered. These could arise either by mutation or by mistakes in role assessment. When mutations and mistakes simply specify that occasionally an animal fights when it [`]should' retreat, selection adjusts reserve strategy to a level where only one ESS (the [`]commonsense' ESS) is possible, if the asymmetry is relevant to payoff. Thus for asymmetries in fighting ability or resource value, the individual with the lower score will retreat. However, we are particularly concerned with cases where both payoff-relevant aspects (fighting ability and resource value) are asymmetric. If opponents sustain contest costs at rates KA and KB, and their resource values are VA and VB, an [`]optimal assessor' strategy defined by the interaction between the two asymmetries, is a unique ESS. It obeys the rule [`]fight on estimating role A, where VA/KA>VB/KB; retreat in B'. If mistakes can occur in both roles, but are very rate, the ESS is not fundamentally altered though there will be infinitesimal tendencies for persisting in role B. Selection to improve assessment abilities intensifies as abilities improve, but is weak if roles A and B are rather similar. Over a range of similarity between roles, an [`]owner wins' convention may be adopted if ownership correlates positively with role A and an individual cannot tell when it would otherwise pay him to break the convention. We also examine a contest in which information about roles can be acquired only during a contest itself, and at a cost. Much depends on the rate at which information is acquired relative to the rate at which costs are expended, and on whether contests normally escalate in intensity, remain at the same level, or de-escalate. Selection favours short contests when costs are high relative to resource value, where the outcome of a round contains much information about fighting ability, and where the actual disparity in fighting ability is large. |
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0003-3472 |
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Equine Behaviour @ team @ |
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5325 |
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| Author |
Hendricks, J.C.; Morrison, A.R. |
| Title |
Normal and abnormal sleep in mammals |
Type |
Journal Article |
| Year |
1981 |
Publication |
Journal of the American Veterinary Medical Association |
Abbreviated Journal |
J Am Vet Med Assoc |
| Volume |
178 |
Issue |
2 |
Pages |
121-126 |
| Keywords |
Animals; Cat Diseases/physiopathology; Cats; Cattle; Dog Diseases/physiopathology; Dogs; Dreams; Horses/physiology; Humans; Narcolepsy/physiopathology/veterinary; Sleep/*physiology; Sleep Apnea Syndromes/physiopathology/veterinary; Sleep Disorders/physiopathology/*veterinary; Sleep, REM/physiology |
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0003-1488 |
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| Notes |
PMID:7204232 |
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no |
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refbase @ user @ |
Serial |
101 |
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| Author |
Henning, J.M.; Zentall, T.R. |
| Title |
Imitation, social facilitation, and the effects of ACTH 4-10 on rats' bar-pressing behavior |
Type |
Journal Article |
| Year |
1981 |
Publication |
The American journal of psychology |
Abbreviated Journal |
Am J Psychol |
| Volume |
94 |
Issue |
1 |
Pages |
125-134 |
| Keywords |
Adrenocorticotropic Hormone/*pharmacology; Animals; Conditioning, Operant/*drug effects; Dose-Response Relationship, Drug; Extinction, Psychological/drug effects; Imitative Behavior/*drug effects; Male; Peptide Fragments/*pharmacology; Rats; *Social Facilitation |
| Abstract |
The effects of ACTH 4-10 on rats' imitation learning was examined during the acquisition and extinction of a bar-press response for water reinforcement. Rats were exposed to either a bar-pressing conspecific (OB), an experimentally naive conspecific (ON), or an empty box (OE) during bar-press acquisition. In a factorial design, each rat was then exposed to one of the same three conditions during extinction. An 80 mcg dose of ACTH 4-10 was administered to half of the rats in each group prior to observation. Performance differences during acquisition were generally small, but significant performance differences during extinction were found. Social facilitation was indicated by the finding that rats extinguished in the presence of a conspecific exhibited significantly greater resistance to extinction than rats extinguished in the presence of an empty box. An imitation effect was also found. Rats that observed a bar-pressing conspecific during both acquisition and extinction (group OB-OB) showed significantly greater resistance top extinction than did groups OB-ON, CB-OE, or OE-OE. There were no significant effects of the hormone, however, relative to saline controls. |
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0002-9556 |
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PMID:6263117 |
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no |
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refbase @ user @ |
Serial |
267 |
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| Author |
Boice, R. |
| Title |
Behavioral comparability of wild and domesticated rats |
Type |
Journal Article |
| Year |
1981 |
Publication |
Behavior Genetics |
Abbreviated Journal |
Behav Genet |
| Volume |
11 |
Issue |
5 |
Pages |
545-553 |
| Keywords |
Animals; *Behavior, Animal; Female; Genetics, Behavioral; Intelligence; Learning; Male; Rats/*genetics |
| Abstract |
The oft-repeated concern for the lack of behavioral comparability of domestic rats with wild forms of Rattus norvegicus is unfounded. Laboratory rats appear to show the potential for all wild-type behaviors, including the most dramatic social postures. Moreover, domestics are capable of assuming a feral existence without difficulty, one where they readily behave in a fashion indistinguishable from wild rats. The one behavioral difference that is clearly established concerns performance in laboratory learning paradigms. The superiority of domestics in these laboratory tasks speaks more to quieting the concerns of degeneracy theorists than to problems of using domestic Norway rats as subjects representative of their species. |
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0001-8244 |
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| Notes |
PMID:7325955 |
Approved |
no |
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Equine Behaviour @ team @ |
Serial |
4144 |
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| Author |
R. A. J. Taylor |
| Title |
The Behavioural Basis of Redistribution I. The Delta -Model Concept |
Type |
Journal Article |
| Year |
1981 |
Publication |
The Journal of Animal Ecology |
Abbreviated Journal |
T. J. Anim. Ecol. |
| Volume |
50 |
Issue |
2 |
Pages |
573-586 |
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(1) A conceptual model is developed in which spatial behaviour is density-dependent. The behaviour is classified as congregatory or migratory according to whether it results in movement towards or away from population concentrations. (2) Spatial behaviour is shown to result from both individual and population interactions. (3) The stability properties of the model are explored and it is shown how, under particular conditions, populations obeying the model have a population density regulating mechanism. (4) The similarity between the model and the potential energy curve of physics is noted, but it is emphasized that this is a behavioural not a physical model. |
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no |
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refbase @ user @ |
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720 |
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| Author |
Bannikov Ag, |
| Title |
Kulan Moskau |
Type |
Book Whole |
| Year |
1981 |
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| Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
921 |
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| Author |
Gingerich Pd, |
| Title |
Variation, sexual dimorphism, and social structure in the early Eocene horse Hyracotherium |
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Journal Article |
| Year |
1981 |
Publication |
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Abbreviated Journal |
Paleobiol |
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Pages |
443-455 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1110 |
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| Author |
Kaseda Y, |
| Title |
The structure of the groups of Misaki horses in Toi Cape |
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Journal Article |
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1981 |
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Abbreviated Journal |
Jpn. J Zootech Sci |
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52 |
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Pages |
227-235 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1233 |
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| Author |
Rubenstein Di, |
| Title |
Behavioural ecology of island feral horeses |
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Journal Article |
| Year |
1981 |
Publication |
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Abbreviated Journal |
Equine. Vet. J. |
| Volume |
13 |
Issue |
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Pages |
27-34 |
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from Professor Hans Klingels Equine Reference List |
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no |
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Serial |
1524 |
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| Author |
SchäFer M, |
| Title |
Beobachtungen zum interspezifischen Aggressionsverhalten eines Halbeselhybrid |
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Journal Article |
| Year |
1981 |
Publication |
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Abbreviated Journal |
Säugetierk Mitt |
| Volume |
29 |
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49-58 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1560 |
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