Header

UZH-Logo

Maintenance Infos

Direct reciprocity stabilises simultaneous hermaphroditism at high mating rates: a model of sex allocation with egg trading


Henshaw, Jonathan M; Kokko, Hanna; Jennions, Michael D (2015). Direct reciprocity stabilises simultaneous hermaphroditism at high mating rates: a model of sex allocation with egg trading. Evolution, 69(8):2129-2139.

Abstract

Simultaneous hermaphroditism is predicted to be unstable at high mating rates given an associated increase in sperm competition. The existence of reciprocal egg trading, which requires both hermaphroditism and high mating rates to evolve, is consequently hard to explain. We show using mathematical models that the presence of a trading economy creates an additional fitness benefit to egg production, which selects for traders to bias their sex allocation towards the female function. This female-biased sex allocation prevents pure females from invading a trading population, thereby allowing simultaneous hermaphroditism to persist stably at much higher levels of sperm competition than would otherwise be expected. More generally, our model highlights that simultaneous hermaphroditism can persist stably when mating opportunities are abundant, as long as sperm competition remains low. It also predicts that reciprocity will select for heavier investment in the traded resource.

Abstract

Simultaneous hermaphroditism is predicted to be unstable at high mating rates given an associated increase in sperm competition. The existence of reciprocal egg trading, which requires both hermaphroditism and high mating rates to evolve, is consequently hard to explain. We show using mathematical models that the presence of a trading economy creates an additional fitness benefit to egg production, which selects for traders to bias their sex allocation towards the female function. This female-biased sex allocation prevents pure females from invading a trading population, thereby allowing simultaneous hermaphroditism to persist stably at much higher levels of sperm competition than would otherwise be expected. More generally, our model highlights that simultaneous hermaphroditism can persist stably when mating opportunities are abundant, as long as sperm competition remains low. It also predicts that reciprocity will select for heavier investment in the traded resource.

Statistics

Citations

1 citation in Web of Science®
1 citation in Scopus®
Google Scholar™

Altmetrics

Downloads

14 downloads since deposited on 09 Dec 2015
13 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2015
Deposited On:09 Dec 2015 10:05
Last Modified:08 Dec 2017 15:14
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0014-3820
Additional Information:Author Posting. © The Authors 2015. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Evolution, Volume 69, Issue 8, pages 2129–2139. http://dx.doi.org/10.1111/evo.12717
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/evo.12717

Download

Download PDF  'Direct reciprocity stabilises simultaneous hermaphroditism at high mating rates: a model of sex allocation with egg trading'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 1MB
View at publisher