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Increased signalling effort when survival prospects decrease: male-male competition ensures honesty.

Candolin1

  • 1Section of Ecology, Department of Biology, University of Turku

Animal Behaviour
|October 18, 2000
PubMed
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The handicap principle suggests honest signals have fitness costs. In sticklebacks, poor condition increased red coloration, reducing signal honesty, but male competition enforced honesty on average.

Area of Science:

  • Evolutionary Biology
  • Animal Behavior

Background:

  • The handicap principle posits that honest signals incur fitness costs, ensuring only high-quality individuals can afford exaggerated signals.
  • Signal costs can decrease with age, potentially leading to increased signalling as a terminal effort, compromising honesty.

Purpose of the Study:

  • To investigate how survival costs and social costs influence the honesty of sexual signals in the three-spined stickleback (Gasterosteus aculeatus).
  • To determine if environmental conditions and male-male competition affect the reliability of nuptial coloration as an indicator of male parental ability.

Main Methods:

  • Experimental manipulation of male condition to assess its impact on nuptial coloration and egg cannibalism.
  • Inclusion of male-male competition to evaluate socially imposed costs on signal expression.

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Main Results:

  • Males in poor condition exhibited increased red coloration, making the signal less reliable for assessing parental ability.
  • Some males in poor condition cannibalized eggs, likely to increase energy reserves.
  • Male-male competition reduced signal expression in poorer quality males, enhancing overall signal honesty.

Conclusions:

  • Socially imposed costs are crucial for maintaining honest sexual signalling.
  • Signal dishonesty can arise when signalling costs are reduced under favorable conditions.
  • Environmental context is vital for understanding the evolution and maintenance of honest sexual signals.