Public Release: 

Winning fights increases aggression, even in crickets

PLOS

Winning a fight can raise aggressiveness, and a study of fighting crickets, published Dec. 21 in the online journal PLoS ONE, provides new insight into the biochemical mechanism that may be responsible.

The researchers, led by Paul Stevenson of the University of Leipzig in Germany, staged cricket "tournaments" to investigate the source of the heightened aggression, called the "winner effect", and the potential role of different treatments on this effect. They found that the increased aggression associated with the winner effect is transient; the aggression levels returned to normal by about 20 minutes post-fight. They also found that treating the crickets with a chemical called epinastine, which interferes with the invertebrate equivalent of the adrenaline pathway, abolished the winner effect, suggesting that this adrenaline-like system is involved in aggression increase.

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Citation: Rillich J, Stevenson PA (2011) Winning Fights Induces Hyperaggression via the Action of the Biogenic Amine Octopamine in Crickets. PLoS ONE 6(12): e28891. doi:10.1371/journal.pone.0028891

Financial Disclosure: Supported by the Deutsche Forschungsgemeinschaft (DFG Research group 1363, project STE 714/4-1). URL: http://www.dfg.de/en/index.jsp. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing Interest Statement: The authors have declared that no competing interests exist.

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