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Author Shettleworth, S.J.
Title Cognitive ecology: field or label? Type Journal Article
Year 2000 Publication Trends in Ecology & Evolution Abbreviated Journal Trends. Ecol. Evol
Volume 15 Issue 4 Pages 161
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Address Depts of Psychology and Zoology, University of Toronto, Toronto, Ontario, Canada M5S 3G3
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ISSN 0169-5347 ISBN Medium
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Notes PMID:10717686 Approved no
Call Number refbase @ user @ Serial 373
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Author Dugatkin, L.A.
Title Bystander effects and the structure of dominance hierarchies Type Journal Article
Year 2001 Publication Behavioral Ecology Abbreviated Journal Behav. Ecol.
Volume 12 Issue 3 Pages 348-352
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Abstract Prior modeling work has found that pure winner and loser effects (i.e., changing the estimation of your own fighting ability as a function of direct prior experience) can have important consequences for hierarchy formation. Here these models are extended to incorporate “bystander effects.” When bystander effects are in operation, observers (i.e., bystanders) of aggressive interactions change their assessment of the protagonists' fighting abilities (depending on who wins and who loses). Computer simulations demonstrate that when bystander winner effects alone are at play, groups have a clear omega (bottom-ranking individual), while the relative position of other group members remains difficult to determine. When only bystander loser effects are in operation, wins and losses are randomly distributed throughout a group (i.e., no discernible hierarchy). When pure and bystander winner effects are jointly in place, a linear hierarchy, in which all positions (i.e., {alpha} to {delta} when N = 4) are clearly defined, emerges. Joint pure and bystander loser effects produce the same result. In principle one could test the predictions from the models developed here in a straightforward comparative study. Hopefully, the results of this model will spur on such studies in the future.
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Notes 10.1093/beheco/12.3.348 Approved no
Call Number refbase @ user @ Serial 441
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Author Mesterton-Gibbons, M.; Dugatkin, L.A.
Title Toward a theory of dominance hierarchies: effects of assessment, group size, and variation in fighting ability Type Journal Article
Year 1995 Publication Behavioral Ecology Abbreviated Journal Behav. Ecol.
Volume 6 Issue 4 Pages 416-423
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Abstract We introduce assessment to the analysis of dominance hierarchies by exploring the effect of an evolutionarily stable fighting rule when there is variation in resource holding potential (RHP) and RHP is not a perfectly reliable predictor of the outcome of a fight. With assessment, the probability of a linear hierarchy decreases with group size but can remain appreciable for groups of up to seven or eight individuals, whereas it decreases virtually to zero if there is no assessment. The probability of a hierarchy that correlates perfectly with RHP is low unless group size is small.
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Notes 10.1093/beheco/6.4.416 Approved no
Call Number refbase @ user @ Serial 447
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Author Cameron, E. Z.,; Linklater, W. L.,; Stafford, K.J.,; Minot, E. O.,
Title Social grouping and maternal behaviour in feral horses (Equus caballus): the influence of males on maternal protectiveness Type Journal Article
Year 2003 Publication Behavioral Ecology and Sociobiology Abbreviated Journal Behav. Ecol. Sociobiol.
Volume 53 Issue 2 Pages 92-101
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Abstract The risk of infant injury or mortality influences maternal behaviour, particularly protectiveness. Mares are found in bands with a single stallion or bands with more than one stallion in which paternity is less certain. We investigated maternal behaviour in relation to band type. Mares in bands with more than one stallion were more protective of their foals, particularly when stallions and foals approached one another. The rate of aggression between the stallion and foal was a significant predictor of maternal protectiveness, and mare protectiveness was significantly correlated with reduced reproductive success in the subsequent year. Mares that changed band types with a foal at foot, or had their band type experimentally altered, were more protective of their foal in multi-stallion bands than they were in single-stallion bands. Equids are unusual amongst ungulates in that infanticide and feticide have been reported. Both occur where paternity has been uncertain, and equid social structure is similar to other species in which infanticide has been reported. Stallions benefit from infanticide as the mare has greater reproductive success in the subsequent year. Stallion aggression is a significant modifier of mare behaviour and maternal effort, probably due to the risk of infanticide.
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Call Number refbase @ user @ Serial 458
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Author Czaran, T.
Title Game theory and evolutionary ecology: Evolutionary Games & Population Dynamics by J. Hofbauer and K. Sigmund, and Game Theory & Animal Behaviour, edited by L.A. Dugatkin and H.K. Reeve Type Journal Article
Year 1999 Publication Trends in Ecology & Evolution Abbreviated Journal Trends. Ecol. Evol
Volume 14 Issue 6 Pages 246-247
Keywords Game theory; Evolutionary ecology; Population dynamics; Ethology
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Call Number refbase @ user @ Serial 485
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Author Dall, Sasha R. X; Houston, Alasdair I.; McNamara, John M.
Title The behavioural ecology of personality: consistent individual differences from an adaptive perspective Type Journal Article
Year 2004 Publication Ecology Letters Abbreviated Journal Ecol. Letters
Volume 7 Issue Pages 734-739
Keywords Adaptive individual differences, behavioural ecology, behavioural syndromes, evolutionary game theory, life history strategies, personality differences, state-dependent dynamic programming
Abstract Individual humans, and members of diverse other species, show consistent differences in

aggressiveness, shyness, sociability and activity. Such intraspecific differences in

behaviour have been widely assumed to be non-adaptive variation surrounding

(possibly) adaptive population-average behaviour. Nevertheless, in keeping with recent

calls to apply Darwinian reasoning to ever-finer scales of biological variation, we sketch

the fundamentals of an adaptive theory of consistent individual differences in behaviour.

Our thesis is based on the notion that such .personality differences. can be selected for if

fitness payoffs are dependent on both the frequencies with which competing strategies

are played and an individual`s behavioural history. To this end, we review existing models

that illustrate this and propose a game theoretic approach to analyzing personality

differences that is both dynamic and state-dependent. Our motivation is to provide

insights into the evolution and maintenance of an apparently common animal trait:

personality, which has far reaching ecological and evolutionary implications.
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Call Number refbase @ user @ Serial 494
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Author Naguib, M.; Amrhein, V.; Kunc, H.P.
Title Effects of territorial intrusions on eavesdropping neighbors: communication networks in nightingales Type Journal Article
Year 2004 Publication Behavioral Ecology Abbreviated Journal Behav. Ecol.
Volume 15 Issue 6 Pages 1011-1015
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Abstract Animal communication often occurs in communication networks in which multiple signalers and receivers are within signaling range of each other. In such networks, individuals can obtain information on the quality and motivation of territorial neighbors by eavesdropping on their signaling interactions. In songbirds, extracting information from interactions involving neighbors is thought to be an important factor in the evolution of strategies of territory defense. In a playback experiment with radio-tagged nightingales Luscinia megarhynchos we here demonstrate that territorial males use their familiar neighbors' performance in a vocal interaction with an unfamiliar intruder as a standard for their own response. Males were attracted by a vocal interaction between their neighbor and a simulated stranger and intruded into the neighbor's territory. The more intensely the neighbor had interacted with playback, the earlier the intrusions were made, indicating that males eavesdropped on the vocal contest involving a neighbor. However, males never intruded when we had simulated by a second playback that the intruder had retreated and sang outside the neighbor's territory. These results suggest that territorial males use their neighbors' singing behavior as an early warning system when territorial integrity is threatened. Simultaneous responses by neighboring males towards unfamiliar rivals are likely to be beneficial to the individuals in maintaining territorial integrity.
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Notes 10.1093/beheco/arh108 Approved no
Call Number refbase @ user @ Serial 499
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Author Rubenstein, D. I.; Hack, M. A.
Title Horse signals: The sounds and scents of fury Type Journal Article
Year 1992 Publication Evolutionary Ecology Abbreviated Journal Evol. Ecol.
Volume 6 Issue 3 Pages 254-260
Keywords ommunication – combat – fighting ability – individual identity – signals – information – assessment – displays
Abstract During contests animals typically exchange information about fighting ability. Among feral horses these signals involve olfactory or acoustical elements and each type can effectively terminate contests before physical contact becomes necessary. Dung transplant experiments show that for stallions, irrespective of rank, olfactory signals such as dung sniffing encode information about familiarity suggesting that such signals can be used as signatures. As such they can provide indirect information about fighting ability as long as opponents associate identity with past performance. Play-back experiments, however, show that vocalizations, such as squeals, directly provide information about status regardless of stallion familiarity. Sonographs reveal that squeals of dominants are longer than those of subordinates and that only those of dominants have at their onset high-frequency components.
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Call Number refbase @ user @ Serial 506
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Author Sharp, T.; Saunders, G.
Title mustering of feral horses Type Manuscript
Year Publication Ecology Abbreviated Journal
Volume Issue Pages
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Abstract Background

Feral horses (Equus caballus) can cause significant environmental damage and losses to

rural industries. Although considered pests, feral horses are also a resource, providing

products such as pet meat for the domestic market and meat for human consumption

for the export market. Control methods include trapping, mustering exclusion fencing,

ground shooting and shooting from helicopters.

Feral horses are mustered by helicopter, motorbike or on horseback, sometimes with the

assistance of coacher horses. Once mustered into yards, net traps or fenced paddocks, the

horses are usually sold to abattoirs for slaughter which can offset the costs of capture and

handling. Less commonly, they are sold as riding horses or relocated to reserves or horse

sanctuaries. Where there is no market for them or where removal may be too costly or

impractical e.g. in conservation areas or remote areas without access to transportation,

horses are sometimes destroyed by shooting in the yards.

This standard operating procedure (SOP) is a guide only; it does not replace or

override the legislation that applies in the relevant State or Territory jurisdiction.

The SOP should only be used subject to the applicable legal requirements (including

OH&S) operating in the relevant jurisdiction.
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Notes Approved no
Call Number refbase @ user @ Serial 517
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Author Dugatkin, L.A.; Earley, R.L.
Title Group fusion: the impact of winner, loser, and bystander effects on hierarchy formation in large groups Type Journal Article
Year 2003 Publication Behavioral Ecology Abbreviated Journal Behav. Ecol.
Volume 14 Issue 3 Pages 367-373
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Abstract We present the results of a series of computer simulations that examined the impact of winner, loser, and bystander effects on hierarchy formation in fused groups. These effects and their implications for hierarchy structure and aggressive interactions were first examined in small four-member groups. Subsequent to this, the two small groups were fused into a single larger group. Further interactions took place in this fused group, generating a new hierarchy. Our models demonstrate clearly that winner, loser, and bystander effects strongly influence both the structure and types of interactions that emerge from the fusion of smaller groups. Four conditions produced results in which the same general patterns were uncovered in pre- and postfusion groups: (1) winner effects alone, (2) bystander loser effects alone, (3) winner and bystander winner effects operating simultaneously, and (4) all four effects in play simultaneously. Outside this parameter space, hierarchy structure and the nature of aggressive interactions differed in pre- and postfusion groups. When only loser effects were in play, one of the two clear alphas from the prefused groups dropped in rank in the eight-member fused group. When bystander winner effects were in play, it was difficult to rank any of the eight individuals in the fused group, and players interacted almost exclusively with those that were not in their original four-member group. When loser and bystander loser effects operated simultaneously, two top-ranking individuals emerged in the fused groups, but the relative rank of the other players was difficult to assign.
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Notes 10.1093/beheco/14.3.367 Approved no
Call Number refbase @ user @ Serial 519
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