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Tactic-specific success in sperm competition.

P Fu1, B D Neff, M R Gross

  • 1Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5R 1G6.

Proceedings. Biological Sciences
|May 26, 2001
PubMed
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In bluegill sunfish, sneak males fertilize more eggs than guard males during sperm competition. Sneakers outperform satellite males, demonstrating tactic-specific success in sexual selection.

Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Animal Reproduction

Background:

  • Sperm competition is a key driver of sexual selection, influencing mating systems and life-history evolution.
  • The sneak-guard model hypothesizes that 'sneak' reproductive tactics will be more successful than 'guard' tactics in sperm competition.

Purpose of the Study:

  • To empirically test the prediction of the sneak-guard model regarding sperm competition success.
  • To investigate the relative success of different sneak tactics (sneakers vs. satellites) in sperm competition.

Main Methods:

  • Field behavioral observations of bluegill sunfish (Lepomis macrochirus) reproductive strategies.
  • Genetic analyses to determine paternity and fertilization success.
  • Development and application of mathematical models for paternity analysis.

Related Experiment Videos

Main Results:

  • Sneak males (cuckolders) achieved higher fertilization success than guard males (parental).
  • Sneakers, a type of sneak male, were more successful in sperm competition than satellite males.
  • Tactic-specific differences in competitive success were identified among sneak males.

Conclusions:

  • Empirical data support the sneak-guard model's prediction of sneak male advantage in sperm competition.
  • Reproductive tactic influences fertilization success, with sneakers outcompeting satellites.
  • Understanding these dynamics is crucial for comprehending mating-system and life-history evolution.