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Heightened aggression and winning contests increase corticosterone but decrease testosterone in male Australian water

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Summary
This summary is machine-generated.

Male water dragons exhibit stable testosterone but increased corticosterone during intense competition. Winning fights actually lowered testosterone, suggesting high stress impacts hormone production and territorial strategies.

Keywords:
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Area of Science:

  • Zoology
  • Animal Behavior
  • Endocrinology

Background:

  • Water dragons (Intellagama [Physignathus] lesueurii) are large agamid lizards from eastern Australia.
  • Males engage in fierce territorial competition, with dominance hierarchies maintained through displays and aggression.

Purpose of the Study:

  • To investigate the relationship between hormone levels (testosterone and corticosterone) and social tactics in male water dragons.
  • To understand the physiological costs of intense male-male competition in this species.

Main Methods:

  • Blood samples were collected from free-ranging adult male water dragons.
  • Hormone levels were analyzed in relation to social tactics, behavior frequency, and aggression levels during experimentally induced unsettled conditions.

Main Results:

  • Baseline testosterone and corticosterone levels did not correlate with social tactics or behavior frequency.
  • Testosterone levels decreased in males that won contests, while corticosterone levels increased with heightened aggression and were higher in contest winners.
  • A positive correlation between testosterone and corticosterone during unstable conditions suggested stress-induced androgen suppression.

Conclusions:

  • Intense male-male competition in water dragons may maintain high baseline testosterone for territorial activities and readiness for take-overs.
  • Elevated corticosterone during intense competition and contest victories indicates a significant physiological cost.
  • Hormonal responses suggest a trade-off between maintaining territorial status and managing long-term energetic costs, potentially involving cycling between territorial and non-territorial tactics.