...Shana E. Border; Taylor J. Piefke; Tyler R. Funnell; Robert F. Fialkowski; Jacob Sawecki; Peter D. Dijkstra ABSTRACT In many animal societies, dominant individuals have priority access to resources. However, defending high rank can be costly, especially in unstable social hierarchies where...

...) and exercise-induced maximal metabolic rate (MMR). Research reveals that red-headed morphs consistently dominate the less aggressive black-headed morphs and that the two morphs differ in other behavioural and physiological traits. We measured daytime RMR of intermorph naïve birds (first-year virgin males...

... opponents and observe that distinct aggressive acts reproducibly precede, concur or follow the establishment of dominance. We find that lunges are insufficient for establishing dominance. Rather, lunges appear to reflect the dominant state of a male and help in maintaining his social status. Lastly, we...

...-documented phenomenon across vertebrates, stem from trade-offs between thermoregulation and stress responsiveness. Because social subordination is known to constrain access to resources in this species, we predicted that T s and dry heat loss of social subordinates, but not social dominants, would fall under...

..., with accelerometers placed on the lobsters to directly detect their carapace vibrations (i.e. the sources of the buzzing sounds). While we found that both dominant and submissive individuals produced carapace vibrations during every agonistic encounter, very few of the associated buzzing sounds (15%) were recorded...

... temperature ( T b ), air temperature ( T a ) and social rank in captive groups in the Kalahari Desert. Socially dominant weavers and bulbuls had lower mean T b than subordinate conspecifics, and dominant individuals of all species maintained more stable T b as T a increased. Dominant bulbuls and larks tended...

... aggression, such as trying to bite, chase and even kill competitor individuals, help males to attain dominance over other individuals and monopolise matings within a territory area ( Bronson, 1979 ). To explore the degree to which aggression is sensitive to impaired antioxidant defence, we used a previously...

... social behavior including division of labor, dominance and aggression. Studying JH functions across social insect species is important for understanding the evolution of sociality; however, these studies have been limited because of the inability to reduce JH levels without surgically removing its...

...): physical development, dominance rank, and group association . Am. J. Phys. Anthropol.   131 , 498 - 510 . Setchell   J. M. , Smith   T. , Wickings   E. J. , Knapp   L. A. ( 2010 ). Stress, social behaviour, and secondary sexual traits in a male primate . Horm. Behav.   58 , 720...

...Clint A. Penick; Colin S. Brent; Kelly Dolezal; Jürgen Liebig Dominance rank in animal societies is correlated with changes in both reproductive physiology and behavior. In some social insects, dominance status is used to determine a reproductive division of labor, where a few colony members...

...Glenn J. Tattersall; Joshua P. Luebbert; Olivia K. LePine; Kiel G. Ormerod; A. Joffre Mercier SUMMARY An unequal resource distribution is commonly seen in dominance hierarchies, in which the individual with the higher status is more successful in obtaining the resource. One possible resource...

.... However, agonistic interactions did influence cell survival. Two weeks after an agonistic interaction, fought males had more newborn neurons than males that did not fight. There was also a rank-specific effect because dominant males had significantly more new neurons than subordinates. We also report...

... whether selection for peak CORT has an effect on the quality of several sexually selected regions of the male zebra finch; in addition we compared morphometric parameters and the dominance ranking in males from the different selection lines. We also tested whether different components of the immune system...

...Holly Y. May; A. Joffre Mercier SUMMARY Reflective surfaces have been shown previously to modify behaviour in socialized crayfish. Socializing crayfish by pairing them for two weeks established a hierarchy with one dominant and one subordinate crayfish per pair. Dominant crayfish exhibited specific...

... of a recent fight is deterred equally well by a familiar and an unfamiliar opponent. Hence, in crayfish, individual recognition of the urine scent of a dominant individual does not appear to be significant for the maintenance of dominance hierarchies. Our results suggest that urine contains information about...

...Fadi A. Issa; Daniel J. Adamson; Donald H. Edwards ABSTRACT The formation of social dominance hierarchies was studied in groups of five juvenile crayfish, 1.3–1.8 cm in length. Animals were grouped together in a small, featureless aquarium after having lived in isolation for more than a month...