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Author |
Rowell, T.E. |
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Title |
The concept of social dominance |
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Journal Article |
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1974 |
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Behavioral Biology |
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Behav Biol |
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11 |
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2 |
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131-154 |
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Dominance has been assumed to be a quality of overwhelming social importance but satisfactory definitions and measures have not been devised. As an indication of predictability of outcome of interaction between animals, it can be explained in terms of ordinary learning processes previous to and during a specific relationship. Agonistic interactions are usually determined and often initiated by the subordinate's behavior, and subordinate behavior is correlated with physiological changes, so that a subordination hierarchy is probably a more useful concept than a dominance hierarchy. Hierarchies develop in stressful conditions, especially in captivity where animals with overresponsive adrenal cortices are at a selective disadvantage. In wild groups hierarchies are tenuous or absent and stress-responsive members are probably advantageous to a group. Group defense and leadership roles are not correlated with rank, but policing is characteristic of high-ranking animals in species where it occurs. There is no evidence that formation of a hierarchy reduces aggression--hierarchies are actually associated with high rates of aggression in primate groups. There is no conclusive evidence that high ranking males have greater overall reproductive success, and an alternative hypothesis that adult males are sexually active for a relatively short stage of their lives fits existing data equally well. |
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2040 |
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Partridge, B.L. |
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Internal dynamics and the interrelations of fish in schools |
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Journal Article |
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1981 |
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Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology |
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J Comp Physiol Sensory Neural Behav Physiol |
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144 |
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3 |
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313-325 |
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The three-dimensional structure of schools of saithe (Pollachius virens) and the interactions between individuals over time were analyzed in 12,240 frames of videotape sampled at 2.7 Hz. Time series analyses of the interactions between identified individuals allowed testing of assumptions of anonymity vs. leadership in schools and investigation of the transfer of information between individuals by which collective decisions are made. Results include the following:1.Saithe match changes in both swimming direction and speed of their neighbors but correlations are greater for swimming speed. Average speed of the school does not greatly affect correlations between neighboring fish although the reaction latencies may be somewhat increased. As shown previously (Partridge et al. 1980) nearest neighbor distance (NND) decreases with increasing school velocity.2.Saithe simultaneously match the headings and swimming speeds of at least their first two nearest neighbors within the school (NN1 and NN2). Partialling out the correlation between a fish's neighbors demonstrates that a fish's correlation to his second nearest neighbor (NN2) is not simply a transitive function of mutual correlation between the NN1 and NN2.3.Several sources of individual variation in schooling performance were examined. In all respects except one, that of preferred positions within the school, saithe showed no individual differences, i.e., some were not “better schoolers” than others. Although fish in the school differed in length by up to a factor of 2.5, no size related effects in NND or nearest neighbor positioning were found.4.Single Linkage Cluster Analysis (SLCA) of the cross-correlations of fishs' swimming speeds and directions demonstrated quantitatively the existence of subgroups within schools if they contain more than 10-11 members. Subgroups acting more-or-less independently in terms of short term variations in speed and direction nonetheless remained within the school as a whole and were not often apparent to observers since members of one group interdigitated with those of another. How individuals know to which subgroup they belong remains unanswered. |
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2063 |
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Anderson, C.; Franks, N.R. |
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Title |
Teams in animal societies |
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Journal Article |
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2001 |
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Behavioral Ecology |
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Behav. Ecol. |
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12 |
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5 |
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534-540 |
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animal societies, cooperation, division of labor, groups, invertebrates, task types, teams, vertebrates |
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We review the existence of teams in animal societies. Teams have previously been dismissed in all but a tiny minority of insect societies. “Team” is a term not generally used in studies of vertebrates. We propose a new rigorous definition of a team that may be applied to both vertebrate and invertebrate societies. We reconsider what it means to work as a team or group and suggest that there are many more teams in insect societies than previously thought. A team task requires different subtasks to be performed concurrently for successful completion. There is a division of labor within a team. Contrary to previous reviews of teams in social insects, we do not constrain teams to consist of members of different castes and argue that team members may be interchangeable. Consequently, we suggest that a team is simply the set of individuals that performs a team task. We contrast teams with groups and suggest that a group task requires the simultaneous performance and cooperation of two or more individuals for successful completion. In a group, there is no division of labor--each individual performs the same task. We also contrast vertebrate and invertebrate teams and find that vertebrate teams tend to be associated with hunting and are based on individual recognition. Invertebrate teams occur in societies characterized by a great deal of redundancy, and we predict that teams in insect societies are more likely to be found in large polymorphic (“complex”) societies than in small monomorphic (“simple”) societies. |
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10.1093/beheco/12.5.534 |
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2070 |
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Author |
Dugatkin, L.A. |
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Title |
Dynamics of the TIT FOR TAT strategy during predator inspection in the guppy (Poecilia reticulata) |
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1991 |
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Behavioral Ecology and Sociobiology |
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Behav. Ecol. Sociobiol. |
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29 |
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2 |
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127-132 |
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One well-known solution to the iterated Prisoner's Dilemma is the TIT FOR TAT strategy. This strategy has three “characteristics” associated with it. TIT FOR TAT is nice (cooperates on the first move of a game), retaliatory (plays defect against an individual that defected on the prior move), and forgiving (cooperates with an individual which has defected in the past but cooperates in the present). Predator inspection behavior in guppies (Poecilia reticulata) was examined in order to determine whether guppies displayed these three characteristics. Results indicate that while it can be quite difficult to translate the abstract concepts of niceness, retaliation, and forgiveness into measurable behaviors, the data support the hypothesis that guppies display the three characteristics associated with the TIT FOR TAT strategy. |
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Equine Behaviour @ team @ |
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2178 |
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Author |
Dugatkin, L.A.; Godin, J.-G.J. |
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Title |
Female mate copying in the guppy (Poecilia reticulata): age-dependent effects |
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Journal Article |
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Year |
1993 |
Publication |
Behavioral Ecology |
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Behav. Ecol. |
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4 |
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4 |
Pages |
289-292 |
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mate choice, copying, guppy, Poecilia reticulata |
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Virtually all studies of mate choice to date have assumed that females choose mates independent of one another. Social cues, however, such as the mate choice of conspecifics, may also play an important role in such decisions. Previous work has shown that female guppies of similar age copy each other's choice of mates. Here we examine the effect of relative age on mate choice copying in the guppy, Poecilia reticulata, and examine whether younger individuals are more likely to copy the mate choice of older conspecifics than vice versa. Results indicate that younger females copy the mate choice of older females, but older individuals do not appear to be influenced by the mate choice of younger individuals. |
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Equine Behaviour @ team @ |
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2181 |
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Wittig, R.M.; Boesch, C. |
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“Decision-making” in conflicts of wild chimpanzees (Pan troglodytes): an extension of the Relational Model |
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2003 |
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Behavioral Ecology and Sociobiology |
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Behav. Ecol. Sociobiol. |
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54 |
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5 |
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491-504 |
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>We examined the “decision-making” process of aggressive interactions within a community of wild chimpanzees ( Pan troglodytes verus) in the Taï National Park, Côte d’Ivoire (West Africa). Costs and benefits were investigated for 876 dyadic aggressive interactions among 18 adults (including 4 independent adolescents) of either sex. An extended version of the Relational Model was developed to describe the dynamics of the “decision-making” process in Taï chimpanzees, which suggests that the net benefit determines the occurrence of conflicts. Both sexes fought more frequently for the resources that were most important to them, food for females and social contexts for males. Individuals used two different strategies according to their likelihood of winning the aggressive interaction, determined by the dominance relationship of the conflict partners. Dominant initiators had longer and more intense aggressive interactions, but they limited their social disadvantages by fighting non-cooperative partners. Subordinate initiators had shorter and less intense aggressive interactions, but risked more social costs, which they could reduce afterwards by reconciliation. Both strategies included a positive overall net benefit. The extended Relational Model fits the complexity of wild chimpanzee conflicts and allows for more flexibility in the “decision-making” compared to the original version. |
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Equine Behaviour @ team @ |
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2206 |
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Berger, J, |
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Social systems, resources, and phylogenetic inertia: an experimental test and its limitations |
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1988 |
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Ecology of Social Behavior |
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157-186 |
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Academic Press |
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San Diego |
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Slobochikoff, C.N. |
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Ecology of Social Behavior |
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Equine Behaviour @ team @ |
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2234 |
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Kirkpatrick, J.F.; Turner, J.W. |
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Changes in herd stallions among feral horse bands and the absence of forced copulation and induced abortion |
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1991 |
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Behavioral Ecology and Sociobiology |
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Behav. Ecol. Sociobiol. |
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29 |
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3 |
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217-219 |
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Forced copulation and induced abortion were investigated in a herd of feral horses inhabiting a coastal barrier island. Eight mares were diagnosed pregnant in August and October 1989 by means of urinary and fecal steroid metabolites, prior to documented changes in herd stallions. These mares were observed for harassment and forced copulation by the new stallions and for the presence of foals during the spring and summer of 1990. No incidents of harassment or attempts at forced copulation were witnessed and seven of the eight mares produced foals in 1990. These data indicate that forced copulation and induced abortion are not common events among all feral horse herds and suggest reinvestigation of this hypothesized phenomenon. |
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Equine Behaviour @ team @ |
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2327 |
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Mayes, E.; Duncan, P. |
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Temporal patterns of feeding behaviour in free-ranging horses |
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1986 |
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Behavior |
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Behav. |
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96 |
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105-129 |
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Equine Behaviour @ team @ |
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2351 |
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Miller, R. |
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Band organisation and stability in Red Desert feral horses |
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1979 |
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Proceedings of a Conference on the Ecology and Behavior of Feral Equids |
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113-123 |
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University of Wyoming. |
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Laramie |
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R.H. Denniston |
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from Professor Hans Klingels Equine Reference List |
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Equine Behaviour @ team @ |
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2361 |
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