The evolution of egg trading in simultaneous hermaphrodites

Peña, Jorge, Nöldeke, Georg and Puebla, Oscar (2018) The evolution of egg trading in simultaneous hermaphrodites. IAST working paper, n. 18-85, Toulouse

[img]
Preview
Text
Download (1MB) | Preview
Official URL: http://iast.fr/pub/33044

Abstract

Egg trading, whereby simultaneous hermaphrodites exchange each other’s eggs for fertilization, constitutes one of the few rigorously documented and most widely cited examples of direct reciprocity among unrelated individuals. Yet how egg trading may initially invade a population of non-trading simultaneous hermaphrodites is still unresolved. Here, we address this question with an analytical model that considers mate encounter rates and costs of egg production in a population that may include traders (who provide eggs for fertilization only if their partners also have eggs to reciprocate), providers (who provide eggs regardless of whether their partners have eggs to reciprocate), and withholders (“cheaters” who only mate in the male role and just use their eggs to elicit egg release from traders). Our results indicate that a combination of intermediate mate encounter rates, sufficiently high costs of egg production, and a sufficiently high probability that traders detect withholders (in which case eggs are not provided) is conducive to the evolution of egg trading. Under these conditions traders can invade—and resist invasion from—providers and withholders alike. The prediction that egg trading evolves only under these specific conditions is consistent with the rare occurrence of this mating system among simultaneous hermaphrodites.

Item Type: Monograph (Working Paper)
Language: English
Date: November 2018
Place of Publication: Toulouse
Subjects: B- ECONOMIE ET FINANCE
Divisions: TSE-R (Toulouse)
Institution: Toulouse Capitole University
Site: UT1
Date Deposited: 07 Nov 2018 09:11
Last Modified: 07 Nov 2018 09:11
OAI ID: oai:tse-fr.eu:33044
URI: http://publications.ut-capitole.fr/id/eprint/26380

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year