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Fig. 1. The strength and directionality of male–male interaction varies with
male social experience. In each test, two tester males of similar age (5 days
old) and genotype (B42/Di2) were paired, and their reciprocal
behavioural interaction noted during 10 min. For each test, the duration and
nature of social experience of each of the two males is shown above the
histograms (the `experience line', which is shown as a bar). Each experience
line is divided into five segments representing the 5 days of adult life (from
eclosion to the test); a black-filled bar represents grouping with four other
same-age and genotype siblings; an open bar represents the period during which
the tester male was kept in isolation. The numbers shown above each experience
line indicate the mean of the behavioural index (BI ±
S.E.M.) for each treatment, and the statistical significance
between treatments is represented above the middle bar
(
P<0.001; *P<0.05; NS,
not significant). The histograms indicate the frequency for pairs of males
according to their BI difference: the two bars on the left represent the cases
of interactions where the `left' male directed a higher BI (differences >10
and >55) towards the `right' male than the reciprocal situation; and
vice versa for the two bars shown on the right (see also Materials
and methods). The middle bar (difference <10) represents the cases with low
or no male–male interaction. N=30–54 except in (C)
(120).
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