Abstract
The diversified leadership hypothesis proposes that different individuals within a school of fish act as leaders in different circumstances. This ‘circumstantial leadership’ results from inter-individual behavioral variability and a ‘cohesion-dispersion’ tendency modulated by ‘failure-success’ contingencies. The hypothesis predicts that when offered different pathways to escape the restriction of their swimming space, individuals within a group of fish will show 1. (a) consistent passage orders in each pathway, but 2. (b) different passage orders in different pathways. Using an avoidance paddle and three different groups of fish ( Aphyocharax erithrurus) the results confirmed prediction 1. (a) while prediction 2. (b) was verified only in one group.
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