Abstract
Field reports provide increasing evidence for local behavioral traditions
among fish, birds, and mammals. These findings are significant for
evolutionary biology because social learning affords faster adaptation
than genetic change and has generated new (cultural) forms of evolution.
Orangutan and chimpanzee field studies suggest that like humans,
these apes are distinctive among animals in each exhibiting over
30 local traditions. However, direct evidence is lacking in apes
and, with the exception of vocal dialects, in animals generally for
the intergroup transmission that would allow innovations to spread
widely and become evolutionarily significant phenomena. Here, we
provide robust experimental evidence that alternative foraging techniques
seeded in different groups of chimpanzees spread differentially not
only within groups but serially across two further groups with substantial
fidelity. Combining these results with those from recent social-diffusion
studies in two larger groups offers the first experimental evidence
that a nonhuman species can sustain unique local cultures, each constituted
by multiple traditions. The convergence of these results with those
from the wild implies a richness in chimpanzees' capacity for culture,
a richness that parsimony suggests was shared with our common ancestor.
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