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Numerous studies have focussed on the relationship between female choice and the multiple exaggerated sexual traits of males.
However, little is known about the ability of males to actively enhance specific components of their display in response to
the loss of one component. We investigated the capacity of male satin bowerbirds (Ptilonorhynchus violaceus) to respond to the loss of one of their sexual signals by performing an experiment in which we removed decorations at their
bowers. We found that males compensated for decoration loss by increasing bower construction behaviour and decreasing their
latency to bower painting. These results are novel because they suggest that males can assess the quality of their own display
and make decisions about how to augment their displays. We discuss these results in the context of previous studies of mate
choice in satin bowerbirds, as both of the supplementary behaviours we observed are known correlates of male mating success. 相似文献
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James A. Nicholls 《Behavioral ecology and sociobiology》2008,62(5):831-841
Avian vocalisations often show patterns of geographic variation. Previous work on the satin bowerbird has shown that although
spatial variation in this species’ advertisement calls is strongly associated with habitat structure, some variation is apparent
within habitat types. Seventeen populations located throughout the species’ distribution were used to examine whether spatial
call variation could be influenced by other processes such as random drift or the presence of fine-scale vocal traditions;
if this were the case, differing call variants would be expected at geographically discrete sampling sites both within and
among habitat types. There were population-specific call variants at each of the sites sampled, with different variants apparent
even within habitat types. At most sites, individuals gave only a single variant of advertisement call, and the call variant
at one site, sampled after a 5-year interval, appears to have been relatively stable. Playback experiments were conducted
at three populations to examine whether local call variants invoked a greater response than several non-local variants differing
in their degree of similarity to the local variant. Birds responded strongly to local call variants but not to either of two
foreign variants, one of which was similar to their local variant and one of which was very different. A pattern of geographic
variation across populations, the fact that local and non-local variants evoke different responses and circumstantial evidence
indicating that individuals can learn new calls all suggest that factors affecting song learning and the ability of males
to establish and defend a bower site may have contributed to the establishment of geographically variable vocal cultures in
this species. 相似文献
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