Dugatkin & Alfieri (1991) demonstrated that guppies prefer co-inspectors
that approached the predator more closely in an inspection bout in which they
themselves participated. Three guppies were allowed to inspect a predator
together, but each fish was separated from the other two by clear partitions that
divided the tank into three lanes. Either immediately following the inspection trial
or 4 h later, the guppy from the middle lane was given a preference test between
the other two inspectors. In both cases, the middle fish preferred to associate with
the inspector that had approached the predator more closely.
These experiments indicate that guppies keep track of the behavior of their
co-inspectors and that they subsequently draw on this information to discriminate
between cooperative and non-cooperative co-inspectors. Dugatkin & Alfieri
(1991), however, did not examine whether individuals demonstrate a preference
for one inspector over another after watching an interaction in which they did not
actually participate. Observational learning has previously been demonstrated in
guppies derived from natural populations in the context of female mate choice. In
these cases, females preferred to mate with males who apparently had been more
successful at attracting females, i.e. mate copying (Dugatkin 1992b, 1996a,b,
2000; but see Brooks 1996; Lafleur et al. 1997 for experimental evidence that mate
copying does not occur in pet-store and feral populations of guppies).
Dugatkin & Alfieri (1991) demonstrated that guppies prefer co-inspectors
that approached the predator more closely in an inspection bout in which they
themselves participated. Three guppies were allowed to inspect a predator
together, but each fish was separated from the other two by clear partitions that
divided the tank into three lanes. Either immediately following the inspection trial
or 4 h later, the guppy from the middle lane was given a preference test between
the other two inspectors. In both cases, the middle fish preferred to associate with
the inspector that had approached the predator more closely.
These experiments indicate that guppies keep track of the behavior of their
co-inspectors and that they subsequently draw on this information to discriminate
between cooperative and non-cooperative co-inspectors. Dugatkin & Alfieri
(1991), however, did not examine whether individuals demonstrate a preference
for one inspector over another after watching an interaction in which they did not
actually participate. Observational learning has previously been demonstrated in
guppies derived from natural populations in the context of female mate choice. In
these cases, females preferred to mate with males who apparently had been more
successful at attracting females, i.e. mate copying (Dugatkin 1992b, 1996a,b,
2000; but see Brooks 1996; Lafleur et al. 1997 for experimental evidence that mate
copying does not occur in pet-store and feral populations of guppies).
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