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Title: Effect of residence and size asymmetries upon the agonistic interactions between juvenile white-seabream (Diplodus sargus cadenati de la Paz, Bauchot and Daget, 1974)
Authors: Caballero, Catalina
Castro, José J. 
UNESCO Clasification: 240114-4 Taxonomía animal. Peces
2408 Etología
Keywords: Diplodus sargus cadenati
Agonistic territorial behaviour
Asymmetrical contest
Prior residency effect
Issue Date: 1999
Publisher: 0096-140X
Journal: Aggressive Behavior 
Abstract: The behavioural patterns of juvenile white‐seabream suggest that asymmetry in residence is an important factor governing the outcome of contest between individuals of this species. Asymmetries due to resident status had strong effects on agonistic behaviour, with asymmetries in body sizes producing weaker effects. Resident fish won all the combats against intruders of lower or similar length. However, when the intruder was larger than the residents (higher than 5% in length and 20% in weight), the percentage of combats won by the residents decreased to 85.7%. There was a significant correlation between fight intensity and size asymmetry in favour of the resident fish. The resident fish was more aggressive and persistent in attacks, and contests were more intense when the size of the intruder was greater. During agonistic interactions, the frontal attacks and lateral displays were more frequent when the intruders were similar or larger than residents. Attacks to the flanks and chases were more frequent in pairs where the intruders were smaller.
ISSN: 0096-140X
DOI: 10.1002/(SICI)1098-2337(1999)25:4<297::AID-AB5>3.0.CO;2-7
Source: Aggressive Behavior [ISSN 0096-140X], v. 25, p. 297-303
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