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Sarah J. Wofford, Ryan L. Earley and Paul A. Moore

influence of mechanical and chemical signals during agonistic encounters by the crayfish, Orconectes rusticus . — Anim. Behav. 70 : 485 - 496 . Bergman D.A. Moore P.A. ( 2003 ). Field observations of intraspecific agonistic behavior of two crayfish species, Orconectes rusticus

J.D. McPhail

display the spot continuously. Experimental and observational evidence suggests the mid-lateral spot inhibits agonistic behaviour in Neoheterandria. The spot apparently evolved as a juvenile species recognition mark and subsequently became an adult appeasement display. REFERENCES BAERENDS, G. P. (1975

Edward O. Price

agonistic behavior. However, the fact that a similar reduction in aggression has been reported for first- generation laboratory-reared rats suggests that further consideration should be given to the effects of the rearing environment, per se (field vs laboratory) on this behavior. Perhaps, the relatively

Cy L. Mott, Haris Dzaferbegovic, Shelby R. Timm and Howard H. Whiteman

kinship reduces the intensity of agonistic behaviour and increases survival among larval stages of a facultatively paedomorphic salamander, we conducted a series of behavioural trials and microcosm experiments using larval mole salamanders, Ambystoma talpoideum . Due to the potentially negative

Jennifer Wortham-Neal

in the number of interactions. The behaviours of Squilla empusa are compared with literature reports concerning other species of mantis shrimp. The differences in habitat, feeding method, vision, and burrow type may explain the differences between smashers and spearer agonistic behaviours. 1) Present

Astra Cioni and Francesca Gherardi

AGONISM AND INTERFERENCE COMPETITION IN FRESHWATER DECAPODS by FRANCESCA GHERARDI 1) and ASTRA CIONI (Dipartimento di Biologia Animale e Genetica ‘Leo Pardi’, Università di Firenze, Italy) (Acc. 12-X-2004) Summary We tested the hypothesis that agonistic behavior and interference competition

Arielle Duhaime-Ross, Geneviève Martel and Frédéric Laberge

chemoreception can interact to modulate agonistic behaviour in this species has however not been studied. Further, the reaction of the salamander used as the visual cue in the experiment conducted by Kohn & Jaeger ( 2009 ) could not be controlled. Focal salamanders could react differently depending on whether an

Frans B.M. De Waal

that 'peep yelping' [17] or 'screaming' [ 1 8] by a vic- tim of aggression turned into whistle-barking when a supporter appeared on the scene. Comparl'son.- Of the three recruitment complexes in the agonistic behavior of chimpanzees (i. e. enlistment, instigation, and begging for support), instigation

Christopher Dunford

BEHAVIORAL ASPECTS OF SPATIAL ORGANIZATION IN THE CHIPMUNK, TAMIAS STRIATUS by CHRISTOPHER DUNFORD (Section of Neurobiology and Behavior, Cornell University, Ithaca, N.Y., U.S.A.) (with 7 Figures) (Rec. 29-X-1969) This study attempts to demonstrate the possible role of agonistic behavior and

K. Chibucos, S.J. Wofford and P.A. Moore

1. Introduction Agonistic behaviour has long been established as behaviour necessary for many animals to obtain vital resources such as shelter, food, and mates (Parker, 1974 ; Smith & Parker, 1976 ). However, fighting behaviour incurs costs on individuals in the form of energy