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On the (in)stability of dominance hierarchies in the cichiid fish Oreochromis mossambicus
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Orientador(es)
Resumo(s)
Dominance hierarchies were studied during 8 weeks in eight heterosexual captive groups
of Oreochromis mossambicus at Ihe unset of sexual maturity. Linearity was assessed for
each group on a weekly basis based on the Landau's index (h) and on the procedure
described by Appleby [Appleby MC (1983): Animal Behaviour 31:600-6081. Week-toweek
stability of the hierarchical structures was measured using the Burk's stability
index (b) and Spearman rank correlation coefficients for the ranks of fishe.s in consecutive
weeks. The two measures of stability showed a high level of concordance but the
Spearman rank correlations were more conservative in detecting cases of stability. Although
most dominance structures were linear they were unstable frum week to week.
Dominant individuals were less likely to experience rank reversals than subordinates.
Rank reversals were especially likely among hierarchical neighbors. Dominance hierarchies
did not -Stabilize in tbe time span of tbis study.
Descrição
Palavras-chave
Dominance Stability Linearity Cichlids
Contexto Educativo
Citação
Aggressive Behavior, 22 (1), 37-45