Hormones, sexual signals, and performance of green anole lizards (Anolis carolinensis)

@article{Husak2007HormonesSS,
  title={Hormones, sexual signals, and performance of green anole lizards (Anolis carolinensis)},
  author={Jerry F. Husak and Duncan J. Irschick and Jay J. Meyers and Simon P Lailvaux and Ignacio T. Moore},
  journal={Hormones and Behavior},
  year={2007},
  volume={52},
  pages={360-367}
}

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References

SHOWING 1-10 OF 77 REFERENCES
Does dewlap size predict male bite performance in Jamaican Anolis lizards
TLDR
It is suggested that dewlap size is an indicator of relative bite force in the former two species, but not in the latter, and it is argued that interspecific variation in territorial behaviour might explain this difference.
The relationship between dewlap size and performance changes with age and sex in a Green Anole (Anolis carolinensis) lizard population
TLDR
This work examines performance traits (bite force, jumping performance) believed to be relevant to an individual's fitness in the lizard Anolis carolinensis and suggests that selective forces influencing the evolution of ornaments may operate differently on different sexes and life-history stages.
Endocrine and behavioral responses to aggression and social dominance in the green anole lizard, Anolis carolinensis.
Bite-Force Performance Predicts Dominance in Male Venerable Collared Lizards (Crotaphytus antiquus)
TLDR
Staged interactions between body size-matched male Venerable Collared Lizards (Crotaphytus antiquus) in the laboratory showed the strong role of weapon performance, as opposed to weapon morphology, in determining dominance.
Morphology, performance and fighting capacity in male lizards, Gallotia galloti
TLDR
The finding that bite performance is linked to dominance fits in with the high sexual dimorphism in head size in this species, as head size is a predictor of bite force performance.
Performance capacity, fighting tactics and the evolution of life–stage male morphs in the green anole lizard (Anolis carolinensis)
TLDR
It is proposed that the heavyweight morph arose through selection against males with small heads and poor bite forces at the lightweight–heavyweight size transition, implying that one may not be able to predict male fighting success by examining aspects of male ‘quality’ at only one life stage.
Sexual dimorphisms in a neuromuscular system regulating courtship in the green anole lizard: effects of season and androgen treatment.
TLDR
Results suggest that, while parallels to behavior exist between the sexes, morphological changes in adulthood in the dewlap motoneurons and muscle do not normally regulate courtship behavior in the male green anole.
Weapon Performance, Not Size, Determines Mating Success and Potential Reproductive Output in the Collared Lizard (Crotaphytus collaris)
TLDR
Using Crotaphytus collaris, a sexually dimorphic lizard in which males use the head as a weapon when territorial interactions escalate to fights, the hypothesis that weapon performance is a better predictor of fitness than body or weapon size is tested.
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