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Whenever a ma.ting system exists that enables an individual to increase its fitness by obtaining
more mates or mates of a higher quality, competition between members of the same sex is
inevitable. Mechanisms enabling an individual to compete effectively with other members of the
same sex are favoured in such a mating system. Males of S. oryzae are able to mate repeatedly
but, as shown in experiment 1, larger males tend to mate sooner and for longer. One possible reason
for variable mating success is that females preferentially select large males as mates and male body
size varies, hence mating success varies. It is curious that body size in S. oryzae is heritable
(Holloway, 1984)., yet correlated with fitness in both females (Richards, 1947) and males (this
study). There may be a trade-off with another character (Rose, 1982), for example survival or time
to maturity, maintaining genetic variability in body weight (Smith et al., 1987).
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10 ส.ค. 55 21:33:24
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