Assessment and individual recognition of opponents in the pygmy swordtails Xiphophorus nigrensis and X. multilineatus

@article{Morris2004AssessmentAI,
  title={Assessment and individual recognition of opponents in the pygmy swordtails Xiphophorus nigrensis and X. multilineatus},
  author={Molly R. Morris and Leila Gass and M. J. Ryan},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={37},
  pages={303-310}
}
We examined factors that determine the outcome of agonistic encounters between male pygmy swordtail fish. Xiphophorus nigrensis and X. multilineatus males formed dominance relationships based on body size in staged laboratory encounters. There was a significant negative correlation between size asymmetry and fight intensity, suggesting that males assessed size in the encounters. However, a significant proportion of the variation in fight intensity in contests that escalated to bites could not… CONTINUE READING
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