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Effect of competitor density on the aggressiveness of juvenile white seabream ( Diplodus sargus cadenati de la Paz, Bauchot and Daget, 1974)
Author(s) -
Caballero Catalina,
CastroHdez José J.
Publication year - 2003
Publication title -
aggressive behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.223
H-Index - 92
eISSN - 1098-2337
pISSN - 0096-140X
DOI - 10.1002/ab.10049
Subject(s) - diplodus , juvenile , agonistic behaviour , fish <actinopterygii> , biology , zoology , demography , psychology , fishery , ecology , developmental psychology , aggression , sociology
The number of aggressive interactions displayed by juveniles of Diplodus sargus cadenati increases progressively in proportion to the number of intruders, with an upper threshold of more than 16 to 18 intruder fish. Beyond this density, resident aggressiveness decreases. The number of aggressive interactions that the resident fish devotes to expelling each intruder shows a clear and significant tendency to decrease as competitor density increases. The resident fish is incapable of rapidly evaluating the outweighing of its capacity for defense. Moreover, the strategy of aggressive defense of the resource against the density of competitors does not seem to be only profitability criteria dependent, but rather there is also a significant influence of the ability to fight shown by the resident. Aggr. Behav. 29:279–284, 2003. © 2003 Wiley‐Liss, Inc.