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	Author	Dugatkin, L.A.
	Title	A comment on Lafleur et al.'s re-evaluation of mate-choice copying in guppies			Type	Journal Article
	Year	1998	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	56	Issue	2	Pages	513-514
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	Publisher		Place of Publication		Editor
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	Series Volume		Series Issue		Edition
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	Area		Expedition		Conference
	Notes				Approved	no
	Call Number				Serial	1812
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	Author	Dugatkin, L.A.; Wilson, D.S.
	Title	Choice experiments and cognition: a reply to Lamprecht & Hofer			Type	Journal Article
	Year	1994	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	47	Issue	6	Pages	1459-1461
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	479
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	Author	Dugatkin, L.A.
	Title	Tit for Tat, by-product mutualism and predator inspection: a reply to Connor			Type	Journal Article
	Year	1996	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	51	Issue	2	Pages	455-457
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	Publisher		Place of Publication		Editor
	Language		Summary Language		Original Title
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	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	refbase @ user @			Serial	487
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	Author	Hasenjager, M.J.; Dugatkin, L.A.
	Title	Social Network Analysis in Behavioral Ecology			Type	Book Chapter
	Year		Publication		Abbreviated Journal
	Volume		Issue		Pages
	Keywords	Animal personalities; Animal social networks; Collective behavior; Cooperation; Dynamic networks; Emergent properties; Network theory; Social behavior; Social learning; Social structure
	Abstract	Abstract In recent years, behavioral ecologists have embraced social network analysis (SNA) in order to explore the structure of animal societies and the functional consequences of that structure. We provide a conceptual introduction to the field that focuses on historical developments, as well as on novel insights generated by recent work. First, we discuss major advances in the analysis of nonhuman societies, culminating in the use of SNA by behavioral ecologists. Next, we discuss how network-based approaches have enhanced our understanding of social structure and behavior over the past decade, focusing on: (1) information transmission, (2) collective behaviors, (3) animal personality, and (4) cooperation. These behaviors and phenomena possess several featuresÂ—e.g., indirect effects, emergent propertiesÂ—that network analysis is well equipped to handle. Finally, we highlight recent developments in SNA that are allowing behavioral ecologists to address increasingly sophisticated questions regarding the structure and function of animal sociality.
	Address
	Corporate Author				Thesis
	Publisher	Academic Press	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title	Advances in the Study of Behavior	Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @ Hasenjager			Serial	5863
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	Author	Chase, I.D.; Bartolomeo, C.; Dugatkin, L.A.
	Title	Aggressive interactions and inter-contest interval: how long do winners keep winning?			Type	Journal Article
	Year	1994	Publication	Animal Behaviour.	Abbreviated Journal	Anim. Behav.
	Volume	48	Issue	2	Pages	393-400
	Keywords
	Abstract	Abstract. Considerable evidence across many taxa demonstrates that prior social experience affects the outcome of subsequent aggressive interactions. Although the 'loser effect', in which an individual losing one encounter is likely to lose the next, is relatively well understood, studies of the 'winner effect', in which winning one encounter increases the probability of winning the next, have produced mixed results. Earlier studies differ concerning whether a winner effect exists, and if it does, how long it lasts. The variation in results, however, may arise from different inter-contest intervals and procedures for selecting contestants employed across previous studies. These methodological differences are addressed through a series of experiments using randomly selected winners and three different inter-contest intervals in the pumpkinseed sunfish, Lepomis gibbosus. The results indicate that a winner effect does in fact exist in pumpkinseed sunfish, but that it only lasts between 15 and 60 min. Based on these results, predictions about the behavioural dynamics of hierarchy formation are discussed, and it is suggested that it may be impossible, in principle, to predict the outcome of dominance interactions between some individuals before they are actually assembled to form a group. Finally, the possible mechanisms underlying the winner effect are explored.
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	873
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	Author	Earley, R.L.; Dugatkin, L.A.
	Title	Eavesdropping on visual cues in green swordtail (Xiphophorus helleri) fights: a case for networking			Type	Journal Article
	Year	2002	Publication	Proceedings. Biological sciences / The Royal Society	Abbreviated Journal	Proc Biol Sci
	Volume	269	Issue	1494	Pages	943-952
	Keywords	Aggression; Animals; Behavior, Animal; *Cyprinodontiformes; Female; Male
	Abstract	Aggressive contests probably occur in networking environments where information about fighting ability is conveyed both to an opponent and to individuals peripheral to the fight itself, the bystanders. Our primary aim was to investigate the relative influences of eavesdropping and prior social experience on the dynamics of aggressive contests in Xiphophorus helleri. A bystander's ability to witness an encounter was manipulated using clear, one-way mirror, and opaque partitions. After watching (or not watching) the initial contest, the bystander encountered either the winner or loser of the bout. Treatment comparisons of bystander-winner or bystander-loser contest dynamics indicated the presence or absence of winner, loser, or eavesdropping effects. Winner and loser effects had negligible influences on bystander contest dynamics. Eavesdropping significantly reduced the bystander's propensity to initiate aggression, escalate, and win against seen winners regardless of whether the watched bout had escalated or not. Though eavesdropping had relatively little effect on bystander-loser contest dynamics, bystanders were less prone to initiate aggression and win against losers that had escalated in the witnessed bout. Thus, bystanders appear to preferentially retain and utilize information gained about potentially dangerous opponents (winners or persistent losers). Our data lend clear support for the importance of eavesdropping in visually based aggressive signalling systems.
	Address	Department of Biology, Life Science, Room 139, University of Louisville, Louisville, KY 40292, USA. rlearl01@athena.louisville.edu
	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0962-8452	ISBN		Medium
	Area		Expedition		Conference
	Notes	PMID:12028778			Approved	no
	Call Number	refbase @ user @			Serial	498
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	Author	Dugatkin, L.A.
	Title	Tendency to inspect predators predicts mortality risk in the guppy (Poecilia reticulata)			Type	Journal Article
	Year	1992	Publication	Behavioral Ecology	Abbreviated Journal	Behav. Ecol.
	Volume	3	Issue	2	Pages	124-127
	Keywords
	Abstract	Although predator inspection behavior in fishes has become a model system for examining game theoretical strategies such as Tit for Tat, the direct costs of inspection behavior have not been quantified. To begin quantifying such costs, I conducted an experiment that examined mortality due to predation as a function of predator inspection in the guppy (Poecilia reticulata). Before being subjected to a “survivorship” experiment, guppies were assayed for their tendency to inspect a predator. Groups were then composed of six guppies that differed in their tendency to inspect. These groups were placed into a pool containing a predator, and survivorship of guppies with different inspection tendencies was noted 36 and 60 h later. Results indicate that individuals that display high degrees of inspection behavior suffer greater mortality than their noninspecting shoalmates.
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	Notes	10.1093/beheco/3.2.124			Approved	no
	Call Number	refbase @ user @			Serial	526
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	Author	Earley, R.L.; Tinsley, M.; Dugatkin, L.A.
	Title	To see or not to see: does previewing a future opponent affect the contest behavior of green swordtail males (Xiphophorus helleri)?			Type	Journal Article
	Year	2003	Publication	Naturwissenschaften	Abbreviated Journal
	Volume	90	Issue	5	Pages	226-230
	Keywords
	Abstract	Animals assess the fighting ability of conspecifics either by engaging in aggressive interactions or observing contests between others. However, whether individuals assess physical prowess outside the context of aggressive interactions remains unknown. We examined whether male green swordtails (Xiphophorus helleri) extract information about the fighting ability of solitary individuals via observation and whether acquiring such information elicits behavioral modifications. Contests preceded by mutual visual assessment were significantly shorter than fights where only one or neither of the two individuals was informed in advance. Focal animals initiated aggressive behavior more often against larger opponents only after previewing their adversary, indicating that swordtails can extract information about relative body size from watching solitary conspecifics. When a fighting disadvantage is perceived, observers adopt tactics that increase their probability of winning the contest.
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	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2180
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	Author	Dugatkin, L.A.; Bekoff, M.
	Title	Play and the evolution of fairness: a game theory model			Type	Journal Article
	Year	2003	Publication	Behavioural Processes	Abbreviated Journal	Behav. Process.
	Volume	60	Issue	3	Pages	209-214
	Keywords	Play; Fairness; Game theory
	Abstract	Bekoff [J. Consci. Stud. 8 (2001) 81] argued that mammalian social play is a useful behavioral phenotype on which to concentrate in order to learn more about the evolution of fairness. Here, we build a game theoretical model designed to formalize some of the ideas laid out by Bekoff, and to examine whether `fair' strategies can in fact be evolutionarily stable. The models we present examine fairness at two different developmental stages during an individual's ontogeny, and hence we create four strategies--fair at time 1/fair at time 2, not fair at time 1/not fair at time 2, fair at time 1/not fair at time 2, not fair at time 1/fair at time 2. Our results suggest that when considering species where fairness can be expressed during two different developmental stages, acting fairly should be more common than never acting fairly. In addition, when no one strategy was evolutionarily stable, we found that all four strategies we model can coexist at evolutionary equilibrium. Even in the absence of an overwhelming database from which to test our model, the general predictions we make have significant implications for the evolution of fairness.
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	Notes				Approved	no
	Call Number	refbase @ user @			Serial	488
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	Author	Johnstone, R.A.; Dugatkin, L.A.
	Title	Coalition formation in animals and the nature of winner and loser effects			Type	Journal Article
	Year	2000	Publication	Proceedings of the Royal Society B: Biological Sciences	Abbreviated Journal	Proc. Roy. Soc. Lond. B Biol. Sci.
	Volume	267	Issue	1438	Pages	17-21
	Keywords
	Abstract	Coalition formation has been documented in a diverse array of taxa, yet there has been little formal analysis of polyadic interactions such as coalitions. Here, we develop an optimality model which examines the role of winner and loser effects in shaping coalition formation. We demonstrate that the predicted patterns of alliances are strongly dependent on the way in which winner and loser effects change with contestant strength. When winner and loser effects decrease with the resource-holding power (RHP) of the combatants, coalitions will be favoured between the strongest members of a group, but not between the weakest. If, in contrast, winner and loser effects increase with RHP, exactly the opposite predictions emerge. All other things being equal, intervention is more likely to prove worthwhile when the beneficiary of the aid is weaker (and its opponent is stronger), because the beneficiary is then less likely to win without help. Consequently, intervention is more probable when the impact of victory on the subsequent performance of a combatant increases with that individual's strength because this selects for intervention in favour of weaker combatants. The published literature on hierarchy formation does not reveal how winner and loser effects actually change with contestant strength and we therefore hope that our model will spur others to collect such data; in this light we suggest an experiment which will help to elucidate the nature of winner and loser effects and their impact on coalition formation in animals.
	Address	* aggression * dominance * hierarchy * intervention * reciprocity
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	Notes	10.1098/rspb.2000.0960			Approved	no
	Call Number	Equine Behaviour @ team @			Serial	5290
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