Evolutionary costs of aggression revealed by testosterone manipulations in free-living male lizards

  title={Evolutionary costs of aggression revealed by testosterone manipulations in free-living male lizards},
  author={Catherine A. Marler and Michael C. Moore},
  journal={Behavioral Ecology and Sociobiology},
We examined the hypothesis that increased aggression results in decreased survivorship. We tested this hypothesis by increasing aggression of free-living male lizards Sceloporus jarrovi with testosterone implants and evaluating the effects on survivorship. A previous study showed that testosterone-implanted males were more aggressive than controls, suggesting a greater degree of success in male-male competition. Results of the present study show that the same testosterone-implanted lizards… CONTINUE READING

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