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The Economics of Egg Trading: Mating Rate, Sperm Competition and Positive Frequency-Dependence

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  • Jonathan Henshaw
  • Michael Jennions
  • Hanna Kokko

Abstract

Egg trading—the alternating exchange of egg parcels during mating by simultaneous hermaphrodites—is one of the best-documented examples of reciprocity between non-relatives. By offering eggs only to partners who reciprocate, traders increase their reproductive success in the male role, but at a potential cost of delaying or reducing fertilisation of their own eggs. Although several authors have considered the evolutionary stability of egg trading once it has evolved, little attention has been paid to how egg trading can invade a population in the first place. We begin to tackle this problem by formally showing that egg trading is under positive frequency-dependent selection: once the proportion of traders in a population exceeds a certain threshold, egg trading will go to fixation. We show that if mate encounters occur frequently, then the cost of withholding eggs from unreciprocating partners is reduced, making it easier for egg trading to evolve. In contrast, the presence of opportunistic ‘streaking’, where unpaired individuals join mating pairs but contribute only sperm, makes it more difficult for egg trading to invade. This is because streakers weaken the link between the number of eggs an individual can offer and its male-role reproductive success. Copyright Springer Science+Business Media New York 2014

Suggested Citation

  • Jonathan Henshaw & Michael Jennions & Hanna Kokko, 2014. "The Economics of Egg Trading: Mating Rate, Sperm Competition and Positive Frequency-Dependence," Dynamic Games and Applications, Springer, vol. 4(4), pages 379-390, December.
    • Handle: RePEc:spr:dyngam:v:4:y:2014:i:4:p:379-390
    DOI: 10.1007/s13235-014-0107-1
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    References listed on IDEAS

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    1. Tim Clutton-Brock, 2009. "Cooperation between non-kin in animal societies," Nature, Nature, vol. 462(7269), pages 51-57, November.
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    Cited by:

    1. Peña, Jorge & Nöldeke, Georg & Puebla, Oscar, 2018. "The evolution of egg trading in simultaneous hermaphrodites," IAST Working Papers 18-85, Institute for Advanced Study in Toulouse (IAST).

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