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Related Experiment Video

Updated: Jun 21, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

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Published on: August 22, 2013

The evolution of continuous variation in ejaculate expenditure strategy.

Samuel J Tazzyman1, Tommaso Pizzari, Robert M Seymour

  • 1CoMPLEX (Centre for Mathematics and Physics in the Life Sciences and Experimental Biology), University College London, London WC1E 6BT, United Kingdom. s.tazzyman@ucl.ac.uk

The American Naturalist
|July 25, 2009
PubMed
Summary

Male ejaculate expenditure varies with the cost of obtaining a mate, not just resource availability. Lower mating costs select for fewer sperm investment per mating, influencing evolutionary strategies.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology

Background:

  • Sperm competition theory often examines species-level or role-specific ejaculate expenditure.
  • Less focus has been placed on continuous variation within populations influencing male investment.

Purpose of the Study:

  • To model how male ejaculate expenditure responds to continuous variation in mating resources and mate acquisition costs.
  • To investigate the impact of individual constraints on ejaculate investment strategies.

Main Methods:

  • Theoretical modeling of optimal ejaculate expenditure.
  • Analysis of two sources of variation: resource allocation to mating and cost of obtaining a mate.

Main Results:

  • Resource availability alone does not drive differing ejaculate investment strategies.
  • Variation in the cost of obtaining a mate selects for reduced sperm investment in males with lower costs.
  • Factors decreasing mate acquisition costs lead to decreased ejaculate investment per mating.

Conclusions:

  • Individual constraints in securing matings can drive variation in ejaculate expenditure.
  • This provides a novel insight into the evolution of male ejaculate expenditure strategies beyond traditional sperm competition models.