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Males and females in our experiment showed the same types and similar rates of contest behavior.
In a study of hermit crabs, components of contest behavior varied between males and females, but this variation was independent of whether the contest was intra- or intersexual (Briffa and Dallaway 2007).
This analysis is highly suited to the analysis of contest behavior because it accounts for the covariance structure of multiple response variables and provides composite measures of behaviors that best describe the variation in the data (Jolliffe 2002).
A possible proximate mechanism accounting for the consistent employment of particular behavioral tactics by vertebrate individuals involves patterns of cerebral lateralization, which can influence the effectiveness of different types of contest behavior (Arnott and Elwood 2009; Arnott et al. 2011).
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Recent theory regarding the effects of experience on contest behavior suggests that as an animal ages and gains experience, it should become less aggressive (Fawcett and Johnstone 2010).
The effects of experience on contest behavior that we see here do not support the idea that male burying beetles gain information on their relative competitive status through either social experience per se or through fighting experience more specifically.
Our results show that not only was there no difference between young and old males in their ability to win a contest (i.e. no effect of age on contest outcome), but there was also no effect of male age on male motivation to win a contest (i.e. no effect of age on contest behavior).
Both males were placed onto the carcass at the same time to avoid any effects of ownership on contest behavior or outcome as previous studies have shown that resource holders are more likely to win contests in N. vespilloides (Otronen 1988).
Furthermore, we investigated whether there were quadratic effects of relative size on contest behavior or outcome.
This allowed us to investigate the effects of male age and social experience on contest behavior and contest outcome (analysis of the first contest), as well as how these treatments influenced winner and loser effects (analysis of second contest).
Our age treatment was specifically designed to investigate the influence of residual reproductive value on contest behavior while controlling for other potential age-related factors.
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